1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 1. Status</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="intro.html" title="Part I. Introduction" /><link rel="prev" href="intro.html" title="Part I. Introduction" /><link rel="next" href="license.html" title="License" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 1. Status</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="intro.html">Prev</a> </td><th width="60%" align="center">Part I. 3 Introduction 4 5</th><td width="20%" align="right"> <a accesskey="n" href="license.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="manual.intro.status"></a>Chapter 1. Status</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="section"><a href="status.html#manual.intro.status.iso">Implementation Status</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#status.iso.1998">C++ 1998/2003</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.1998.status">Implementation Status</a></span></dt><dt><span class="section"><a href="status.html#iso.1998.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2011">C++ 2011</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2011.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2014">C++ 2014</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2014.specific">Implementation Specific Behavior</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2014.filesystemts">Filesystem TS</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="status.html#status.iso.2017">C++ 2017</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2017.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2020">C++ 2020</a></span></dt><dt><span class="section"><a href="status.html#status.iso.tr1">C++ TR1</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.tr1.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.tr24733">C++ TR 24733</a></span></dt><dt><span class="section"><a href="status.html#status.iso.specfun">C++ IS 29124</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.specfun.specific">Implementation Specific Behavior</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="license.html">License</a></span></dt><dd><dl><dt><span class="section"><a href="license.html#manual.intro.status.license.gpl">The Code: GPL</a></span></dt><dt><span class="section"><a href="license.html#manual.intro.status.license.fdl">The Documentation: GPL, FDL</a></span></dt></dl></dd><dt><span class="section"><a href="bugs.html">Bugs</a></span></dt><dd><dl><dt><span class="section"><a href="bugs.html#manual.intro.status.bugs.impl">Implementation Bugs</a></span></dt><dt><span class="section"><a href="bugs.html#manual.intro.status.bugs.iso">Standard Bugs</a></span></dt></dl></dd></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.status.iso"></a>Implementation Status</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.1998"></a>C++ 1998/2003</h3></div></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.1998.status"></a>Implementation Status</h4></div></div></div><p> 6This status table is based on the table of contents of ISO/IEC 14882:2003. 7</p><p> 8This section describes the C++ support in mainline GCC, not in any 9particular release. 10</p><div class="table"><a id="table.cxx98_status"></a><p class="title"><strong>Table 1.1. C++ 1998/2003 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 1998/2003 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 11 <span class="emphasis"><em>18</em></span> 12 </td><td colspan="3" align="left"> 13 <span class="emphasis"><em>Language support</em></span> 14 </td></tr><tr><td align="left">18.1</td><td align="left">Types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2</td><td align="left">Implementation properties</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2.1</td><td align="left">Numeric Limits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.2.1.1</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2.1.2</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td class="auto-generated"> </td></tr><tr><td align="left">18.2.1.3</td><td align="left"><code class="code">float_round_style</code></td><td align="left">Y</td><td class="auto-generated"> </td></tr><tr><td align="left">18.2.1.4</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">Y</td><td class="auto-generated"> </td></tr><tr><td align="left">18.2.1.5</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2.2</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3</td><td align="left">Start and termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.4</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.5</td><td align="left">Type identification</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.5.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.5.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.5.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.6.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6.2</td><td align="left">Violation exception-specifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 15 <span class="emphasis"><em>19</em></span> 16 </td><td colspan="3" align="left"> 17 <span class="emphasis"><em>Diagnostics</em></span> 18 </td></tr><tr><td align="left">19.1</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.2</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.3</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 19 <span class="emphasis"><em>20</em></span> 20 </td><td colspan="3" align="left"> 21 <span class="emphasis"><em>General utilities</em></span> 22 </td></tr><tr><td align="left">20.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.2</td><td align="left"><code class="code">pair</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.3.1</td><td align="left">Base</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.2</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.3</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.4</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.5</td><td align="left">Negators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.6</td><td align="left">Binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.7</td><td align="left">Adaptors for pointers to functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.8</td><td align="left">Adaptors for pointers to members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4</td><td align="left">Memory</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.1</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.3</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4.1</td><td align="left"><code class="code">uninitialized_copy</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4.2</td><td align="left"><code class="code">uninitialized_fill</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4.3</td><td align="left"><code class="code">uninitialized_fill_n</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.5</td><td align="left">Class template <code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.6</td><td align="left">C library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 23 <span class="emphasis"><em>21</em></span> 24 </td><td colspan="3" align="left"> 25 <span class="emphasis"><em>Strings</em></span> 26 </td></tr><tr><td align="left">21.1</td><td align="left">Character traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.1.1</td><td align="left">Character traits requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.1.2</td><td align="left">traits typedef</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.1.3</td><td align="left"><code class="code">char_traits</code> specializations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.1.3.1</td><td align="left">struct <code class="code">char_traits<char></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.1.3.2</td><td align="left">struct <code class="code">char_traits<wchar_t></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Null-terminated sequence utilities</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left"> 27 <span class="emphasis"><em>22</em></span> 28 </td><td colspan="3" align="left"> 29 <span class="emphasis"><em>Localization</em></span> 30 </td></tr><tr><td align="left">22.1</td><td align="left">Locales</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.1.1</td><td align="left">Class <code class="code">locale</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.1.2</td><td align="left"><code class="code">locale</code> globals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.1.3</td><td align="left">Convenience interfaces</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.1.3.1</td><td align="left">Character classification</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.1.3.2</td><td align="left">Character conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Standard locale categories</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.1</td><td align="left"><code class="code">ctype</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.2</td><td align="left">Numeric</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.2.1</td><td align="left"><code class="code">num_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.2.2</td><td align="left"><code class="code">num_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.3</td><td align="left"><code class="code">num_punct</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.4</td><td align="left"><code class="code">collate</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5</td><td align="left">Time</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.5.1</td><td align="left"><code class="code">time_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5.2</td><td align="left"><code class="code">time_get_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5.3</td><td align="left"><code class="code">time_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5.3</td><td align="left"><code class="code">time_put_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6</td><td align="left">Monetary</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.6.1</td><td align="left"><code class="code">money_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6.2</td><td align="left"><code class="code">money_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6.3</td><td align="left"><code class="code">money_punct</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6.4</td><td align="left"><code class="code">money_punct_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.7</td><td align="left"><code class="code">messages</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.8</td><td align="left">Program-defined facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 31 <span class="emphasis"><em>23</em></span> 32 </td><td colspan="3" align="left"> 33 <span class="emphasis"><em>Containers</em></span> 34 </td></tr><tr><td align="left">23.1</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Sequence containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.1</td><td align="left">Class template <code class="code">deque</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.2</td><td align="left">Class template <code class="code">list</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3</td><td align="left">Adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.3.1</td><td align="left">Class template <code class="code">queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3.2</td><td align="left">Class template <code class="code">priority_queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3.3</td><td align="left">Class template <code class="code">stack</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.4</td><td align="left">Class template <code class="code">vector</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.5</td><td align="left">Class <code class="code">vector<bool></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3</td><td align="left">Associative containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.3.1</td><td align="left">Class template <code class="code">map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.2</td><td align="left">Class template <code class="code">multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.3</td><td align="left">Class template <code class="code">set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.4</td><td align="left">Class template <code class="code">multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 35 <span class="emphasis"><em>24</em></span> 36 </td><td colspan="3" align="left"> 37 <span class="emphasis"><em>Iterators</em></span> 38 </td></tr><tr><td align="left">24.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">Predefined iterators and Iterator adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.4.1</td><td align="left">Reverse iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.2</td><td align="left">Insert iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5</td><td align="left">Stream iterators</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.5.1</td><td align="left">Class template <code class="code">istream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.2</td><td align="left">Class template <code class="code">ostream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.3</td><td align="left">Class template <code class="code">istreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.4</td><td align="left">Class template <code class="code">ostreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 39 <span class="emphasis"><em>25</em></span> 40 </td><td colspan="3" align="left"> 41 <span class="emphasis"><em>Algorithms</em></span> 42 </td></tr><tr><td align="left">25.1</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 43 <span class="emphasis"><em>26</em></span> 44 </td><td colspan="3" align="left"> 45 <span class="emphasis"><em>Numerics</em></span> 46 </td></tr><tr><td align="left">26.1</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">Numeric arrays</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.3.1</td><td align="left">Header <code class="code"><valarray></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.2</td><td align="left">Class template <code class="code">valarray</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.3</td><td align="left"><code class="code">valarray</code> non-member operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.4</td><td align="left">Class <code class="code">slice</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.5</td><td align="left">Class template <code class="code">slice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.6</td><td align="left">Class <code class="code">gslice</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.7</td><td align="left">Class template <code class="code">gslice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.8</td><td align="left">Class template <code class="code">mask_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.9</td><td align="left">Class template <code class="code">indirect_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Generalized numeric operations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.4.1</td><td align="left"><code class="code">accumulate</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.2</td><td align="left"><code class="code">inner_product</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.3</td><td align="left"><code class="code">partial_sum</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.4</td><td align="left"><code class="code">adjacent_difference</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.5</td><td align="left">iota</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 47 <span class="emphasis"><em>27</em></span> 48 </td><td colspan="3" align="left"> 49 <span class="emphasis"><em>Input/output</em></span> 50 </td></tr><tr><td align="left">27.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3.1</td><td align="left">Narrow stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3.2</td><td align="left">Wide stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 51 <span class="emphasis"><em>Appendix D</em></span> 52 </td><td colspan="3" align="left"> 53 <span class="emphasis"><em>Compatibility features</em></span> 54 </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with bool operand</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">static</code> keyword</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.3</td><td align="left">Access declarations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.4</td><td align="left">Implicit conversion from const strings</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left">char* streams</td><td align="left"> </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.1998.specific"></a>Implementation Specific Behavior</h4></div></div></div><p> 55 The ISO standard defines the following phrase: 56 </p><div class="blockquote"><blockquote class="blockquote"><div class="variablelist"><dl class="variablelist"><dt><span class="term"> 57 <code class="code">[1.3.5] implementation-defined behavior</code> 58 </span></dt><dd><p> 59 Behavior, for a well-formed program construct and correct data, that 60 depends on the implementation <span class="emphasis"><em>and that each implementation 61 shall document</em></span>. 62 </p></dd></dl></div></blockquote></div><p> 63 We do so here, for the C++ library only. Behavior of the 64 compiler, linker, runtime loader, and other elements of "the 65 implementation" are documented elsewhere. Everything listed 66 in Annex B, Implementation Qualities, are also part of the 67 compiler, not the library. 68 </p><p> 69 For each entry, we give the section number of the standard, when 70 applicable. This list is probably incomplet and inkorrekt. 71 </p><p> 72 <span class="emphasis"><em>[1.9]/11 #3</em></span> If <code class="code">isatty(3)</code> is true, then 73 interactive stream support is implied. 74 </p><p> 75 <span class="emphasis"><em>[17.4.4.5]</em></span> Non-reentrant functions are probably best 76 discussed in the various sections on multithreading (see above). 77 </p><p><span class="emphasis"><em>[18.1]/4</em></span> The type of <code class="code">NULL</code> is described 78 under <a class="link" href="support.html#std.support.types.null" title="NULL">Support</a>. 79 </p><p><span class="emphasis"><em>[18.3]/8</em></span> Even though it's listed in the library 80 sections, libstdc++ has zero control over what the cleanup code hands 81 back to the runtime loader. Talk to the compiler people. :-) 82 </p><p><span class="emphasis"><em>[18.4.2.1]/5</em></span> (bad_alloc), 83 <span class="emphasis"><em>[18.5.2]/5</em></span> (bad_cast), 84 <span class="emphasis"><em>[18.5.3]/5</em></span> (bad_typeid), 85 <span class="emphasis"><em>[18.6.1]/8</em></span> (exception), 86 <span class="emphasis"><em>[18.6.2.1]/5</em></span> (bad_exception): The <code class="code">what()</code> 87 member function of class <code class="code">std::exception</code>, and these other 88 classes publicly derived from it, returns the name of the 89 class, e.g. <code class="literal">"std::bad_alloc"</code>. 90 </p><p><span class="emphasis"><em>[18.5.1]/7</em></span> The return value of 91 <code class="code">std::type_info::name()</code> is the mangled type name. 92 You will need to call <code class="code">c++filt</code> and pass the names as 93 command-line parameters to demangle them, or call a 94 <a class="link" href="ext_demangling.html" title="Chapter 28. Demangling">runtime demangler function</a>. 95 </p><p><span class="emphasis"><em>[20.1.5]/5</em></span> <span class="emphasis"><em>"Implementors are encouraged to 96 supply libraries that can accept allocators that encapsulate more 97 general memory models and that support non-equal instances. In such 98 implementations, any requirements imposed on allocators by containers 99 beyond those requirements that appear in Table 32, and the semantics 100 of containers and algorithms when allocator instances compare 101 non-equal, are implementation-defined."</em></span> There is experimental 102 support for non-equal allocators in the standard containers in C++98 103 mode. There are no additional requirements on allocators. It is undefined 104 behaviour to swap two containers if their allocators are not equal. 105 </p><p><span class="emphasis"><em>[21.1.3.1]/3,4</em></span>, 106 <span class="emphasis"><em>[21.1.3.2]/2</em></span>, 107 <span class="emphasis"><em>[21.3]/6 basic_string::iterator, basic_string::const_iterator</em></span>, 108 <span class="emphasis"><em>[23.*]'s foo::iterator</em></span>, 109 <span class="emphasis"><em>[27.*]'s foo::*_type</em></span>, 110 <span class="emphasis"><em>others...</em></span> 111 Nope, these types are called implementation-defined because you 112 shouldn't be taking advantage of their underlying types. Listing them 113 here would defeat the purpose. :-) 114 </p><p><span class="emphasis"><em>[21.1.3.1]/5</em></span> I don't really know about 115 the <span class="type">mbstate_t</span> stuff... see 116 the <a class="link" href="facets.html#std.localization.facet.codecvt" title="codecvt"><code class="code">codecvt</code> 117 notes</a> for what does exist. 118 </p><p><span class="emphasis"><em>[22.*]</em></span> Anything and everything we have on locale 119 implementation will be described under 120 <a class="link" href="localization.html#std.localization.locales.locale" title="locale">Localization</a>. 121 </p><p><span class="emphasis"><em>[23.*]</em></span> All of the containers in this clause 122 define <span class="type">size_type</span> as <span class="type">std::size_t</span> and 123 <span class="type">difference_type</span> as <span class="type">std::ptrdiff_t</span>. 124 </p><p><span class="emphasis"><em>[26.2.8]/9</em></span> I have no idea what 125 <code class="code">complex<T></code>'s <code class="code">pow(0,0)</code> returns. 126 </p><p><span class="emphasis"><em>[27.4.2.4]/2</em></span> Calling 127 <code class="code">std::ios_base::sync_with_stdio</code> after I/O has already been 128 performed on the standard stream objects will 129 flush the buffers, and 130 destroy and recreate the underlying buffer instances. Whether or not 131 the previously-written I/O is destroyed in this process depends mostly 132 on the <code class="code">--enable-libio</code> choice: for stdio, if the written 133 data is already in the stdio buffer, the data may be completely safe! 134 </p><p><span class="emphasis"><em>[27.6.1.1.2]</em></span>, 135 <span class="emphasis"><em>[27.6.2.3]</em></span> The I/O sentry ctor and dtor can perform 136 additional work than the minimum required. We are not currently taking 137 advantage of this yet. 138 </p><p><span class="emphasis"><em>[27.7.1.3]/16</em></span>, 139 <span class="emphasis"><em>[27.8.1.4]/10</em></span> 140 The effects of <code class="code">pubsetbuf/setbuf</code> are described in the 141 <a class="link" href="io.html" title="Chapter 13. Input and Output">Input and Output</a> chapter. 142 </p><p><span class="emphasis"><em>[27.8.1.4]/16</em></span> Calling <code class="code">fstream::sync</code> when 143 a get area exists will... whatever <code class="code">fflush()</code> does, I think. 144 </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2011"></a>C++ 2011</h3></div></div></div><p> 145<a id="status.iso.200x"></a> 146This table is based on the table of contents of ISO/IEC 147JTC1 SC22 WG21 Doc No: N3290 Date: 2011-04-11 148Final Draft International Standard, Standard for Programming Language C++ 149</p><p> 150In this implementation the <code class="literal">-std=gnu++11</code> or 151<code class="literal">-std=c++11</code> flag must be used to enable language 152and library 153features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 154options. The pre-defined symbol 155<code class="constant">__cplusplus</code> is used to check for the 156presence of the required flag. 157GCC 5.1 was the first release with non-experimental C++11 support, 158so the API and ABI of features added in C++11 is only stable 159since that release. 160</p><p> 161This status table is based on the table of contents of ISO/IEC 14882:2011. 162</p><p> 163This section describes the C++11 support in mainline GCC, not in any 164particular release. 165</p><div class="table"><a id="table.cxx11_status"></a><p class="title"><strong>Table 1.2. C++ 2011 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2011 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 166 <span class="emphasis"><em>18</em></span> 167 </td><td colspan="3" align="left"> 168 <span class="emphasis"><em>Language support</em></span> 169 </td></tr><tr><td align="left">18.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.2</td><td align="left">Types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3</td><td align="left">Implementation properties</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2</td><td align="left">Numeric Limits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2.3</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.2.4</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.5</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.6</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">18.3.2.7</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.3</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.4</td><td align="left">Integer types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.4.1</td><td align="left">Header <code class="code"><cstdint></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">18.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">18.6</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7</td><td align="left">Type identification</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.7.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.8.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.2</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.5</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.6</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9</td><td align="left">Initializer lists</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.9.1</td><td align="left">Initializer list constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.2</td><td align="left">Initializer list access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.3</td><td align="left">Initializer list range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 170 <span class="emphasis"><em>19</em></span> 171 </td><td colspan="3" align="left"> 172 <span class="emphasis"><em>Diagnostics</em></span> 173 </td></tr><tr><td align="left">19.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5</td><td align="left">System error support</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.5.1</td><td align="left">Class <code class="code">error_category</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.2</td><td align="left">Class <code class="code">error_code</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.3</td><td align="left">Class <code class="code">error_condition</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.4</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.5</td><td align="left">Class <code class="code">system_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 174 <span class="emphasis"><em>20</em></span> 175 </td><td colspan="3" align="left"> 176 <span class="emphasis"><em>General utilities</em></span> 177 </td></tr><tr><td align="left">20.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.2</td><td align="left">swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.3</td><td align="left">forward/move helpers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.4</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3</td><td align="left">Pairs</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.3.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.3.2</td><td align="left">Class template <code class="code">pair</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.3</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.4</td><td align="left">Tuple-like access to <code class="code">pair</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.5</td><td align="left">Piecewise construction</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4</td><td align="left">Tuples</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.2</td><td align="left">Class template <code class="code">tuple</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.2.1</td><td align="left">Construction</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.2</td><td align="left">Assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.3</td><td align="left">Swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.4</td><td align="left">Tuple creation functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.5</td><td align="left">Tuple helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.6</td><td align="left">Element access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.7</td><td align="left">Relational operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.8</td><td align="left">Tuple traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.9</td><td align="left">Tuple specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5</td><td align="left">Class template <code class="code">bitset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.1</td><td align="left"><code class="code">bitset</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.2</td><td align="left"><code class="code">bitset</code> members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.3</td><td align="left"><code class="code">bitset</code> hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.4</td><td align="left"><code class="code">bitset</code> operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6</td><td align="left">Memory</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.2</td><td align="left">Header <code class="code"><memory></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.3</td><td align="left">Pointer traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.4</td><td align="left">Pointer safety</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.5</td><td align="left">Align</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.6</td><td align="left">Allocator argument tag</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.7</td><td align="left"><code class="code">uses_allocator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.8</td><td align="left">Allocator traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.10</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.11</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12</td><td align="left">Specialized algorithms</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.12.1</td><td align="left"><code class="code">addressof</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12.2</td><td align="left"><code class="code">uninitialized_copy</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12.3</td><td align="left"><code class="code">uninitialized_fill</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12.4</td><td align="left"><code class="code">uninitialized_fill_n</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.13</td><td align="left">C library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.7.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2</td><td align="left">Shared-ownership pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.7.2.1</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.2</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left">Y</td><td align="left"> 178 Uses code from 179 <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>. 180 </td></tr><tr><td align="left">20.7.2.3</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.4</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.5</td><td align="left"><code class="code">shared_ptr</code> atomic access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.6</td><td align="left">Smart pointer hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.1</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.2</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.3</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.4</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.5</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.6</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.7</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.8</td><td align="left">Negators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.9</td><td align="left">Function template <code class="code">bind</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.10</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.11</td><td align="left">Polymorphic function wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.11.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">20.8.11.2</td><td align="left">Class template <code class="code">function</code></td><td align="left">Partial</td><td align="left">Missing allocator support</td></tr><tr><td align="left">20.8.12</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9</td><td align="left">Metaprogramming and type traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4.1</td><td align="left">Primary type categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4.2</td><td align="left">Composite type traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4.3</td><td align="left">Type properties</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7</td><td align="left">Transformations between types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.7.1</td><td align="left">Const-volatile modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.2</td><td align="left">Reference modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.3</td><td align="left">Sign modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.4</td><td align="left">Array modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.5</td><td align="left">Pointer modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.6</td><td align="left">Other transformations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10</td><td align="left">Compile-time rational arithmetic</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.2</td><td align="left">Header <code class="code"><ratio></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.3</td><td align="left">Class template <code class="code">ratio</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.4</td><td align="left">Arithmetic on <code class="code">ratio</code>s</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.5</td><td align="left">Comparison of <code class="code">ratio</code>s</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.6</td><td align="left">SI types for <code class="code">ratio</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11</td><td align="left">Time utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.11.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.4</td><td align="left">Time-related traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.11.4.1</td><td align="left"><code class="code">treat_as_floating_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.4.2</td><td align="left"><code class="code">duration_values</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.4.3</td><td align="left">Specializations of <code class="code">common_type</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.7</td><td align="left">Clocks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.11.7.1</td><td align="left">Class <code class="code">system_clock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.7.2</td><td align="left">Class <code class="code">steady_clock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.7.3</td><td align="left">Class <code class="code">high_resolution_clock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.8</td><td align="left">Date and time functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12</td><td align="left">Scoped allocator adaptor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.1</td><td align="left">Header <code class="code"><scoped_allocator></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.12.2</td><td align="left">Scoped allocator adaptor member types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.3</td><td align="left">Scoped allocator adaptor constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.4</td><td align="left">Scoped allocator adaptor members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.5</td><td align="left">Scoped allocator operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.13</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 181 <span class="emphasis"><em>21</em></span> 182 </td><td colspan="3" align="left"> 183 <span class="emphasis"><em>Strings</em></span> 184 </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">Character traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.2.1</td><td align="left">Character traits requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.2</td><td align="left">traits typedefs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3</td><td align="left"><code class="code">char_traits</code> specializations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.2.3.1</td><td align="left">struct <code class="code">char_traits<char></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3.2</td><td align="left">struct <code class="code">char_traits<char16_t></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3.3</td><td align="left">struct <code class="code">char_traits<char32_t></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3.4</td><td align="left">struct <code class="code">char_traits<wchar_t></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.5</td><td align="left">Numeric Conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">21.7</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left"> 185 <span class="emphasis"><em>22</em></span> 186 </td><td colspan="3" align="left"> 187 <span class="emphasis"><em>Localization</em></span> 188 </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Header <code class="code"><locale></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">Locales</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.3.1</td><td align="left">Class <code class="code">locale</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.2</td><td align="left"><code class="code">locale</code> globals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3</td><td align="left">Convenience interfaces</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.3.3.1</td><td align="left">Character classification</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3.2</td><td align="left">Conversions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.3.3.2.1</td><td align="left">Character conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3.2.2</td><td align="left"><code class="code">string</code> conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3.2.3</td><td align="left">Buffer conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.1</td><td align="left">The <code class="code">ctype</code> category</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.2</td><td align="left">The numeric category</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.2.1</td><td align="left"><code class="code">num_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.2.2</td><td align="left"><code class="code">num_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.3</td><td align="left">The numeric punctuation facet</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.4</td><td align="left">The collate category</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5</td><td align="left">The time category</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.5.1</td><td align="left">Class template <code class="code">time_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5.2</td><td align="left">Class template <code class="code">time_get_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5.3</td><td align="left">Class template <code class="code">time_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5.3</td><td align="left">Class template <code class="code">time_put_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6</td><td align="left">The monetary category</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.6.1</td><td align="left">Class template <code class="code">money_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6.2</td><td align="left">Class template <code class="code">money_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6.3</td><td align="left">Class template <code class="code">money_punct</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6.4</td><td align="left">Class template <code class="code">money_punct_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.7</td><td align="left">The message retrieval category</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.8</td><td align="left">Program-defined facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.5</td><td align="left">Standard code conversion facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.6</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 189 <span class="emphasis"><em>23</em></span> 190 </td><td colspan="3" align="left"> 191 <span class="emphasis"><em>Containers</em></span> 192 </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Container requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.1</td><td align="left">General container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.2</td><td align="left">Container data races</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3</td><td align="left">Sequence containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.3.2</td><td align="left">Class template <code class="code">array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.3</td><td align="left">Class template <code class="code">deque</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.4</td><td align="left">Class template <code class="code">forward_list</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.5</td><td align="left">Class template <code class="code">list</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.6</td><td align="left">Class template <code class="code">vector</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.7</td><td align="left">Class <code class="code">vector<bool></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4</td><td align="left">Associative containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.4.4</td><td align="left">Class template <code class="code">map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4.5</td><td align="left">Class template <code class="code">multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4.6</td><td align="left">Class template <code class="code">set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4.7</td><td align="left">Class template <code class="code">multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5</td><td align="left">Unordered associative containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.5.4</td><td align="left">Class template <code class="code">unordered_map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5.5</td><td align="left">Class template <code class="code">unordered_multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5.6</td><td align="left">Class template <code class="code">unordered_set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5.7</td><td align="left">Class template <code class="code">unordered_multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6</td><td align="left">Container adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.6.1</td><td align="left">Class template <code class="code">queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6.2</td><td align="left">Class template <code class="code">priority_queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6.3</td><td align="left">Class template <code class="code">stack</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 193 <span class="emphasis"><em>24</em></span> 194 </td><td colspan="3" align="left"> 195 <span class="emphasis"><em>Iterators</em></span> 196 </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5</td><td align="left">Iterator adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.5.1</td><td align="left">Reverse iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.2</td><td align="left">Insert iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.3</td><td align="left">Move iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6</td><td align="left">Stream iterators</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.6.1</td><td align="left">Class template <code class="code">istream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.2</td><td align="left">Class template <code class="code">ostream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.3</td><td align="left">Class template <code class="code">istreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.4</td><td align="left">Class template <code class="code">ostreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.5</td><td align="left">range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 197 <span class="emphasis"><em>25</em></span> 198 </td><td colspan="3" align="left"> 199 <span class="emphasis"><em>Algorithms</em></span> 200 </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.5</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 201 <span class="emphasis"><em>26</em></span> 202 </td><td colspan="3" align="left"> 203 <span class="emphasis"><em>Numerics</em></span> 204 </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">Random number generation</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.1</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.2</td><td align="left">Header <code class="code"><random></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.3</td><td align="left">Random number engine class templates</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.3.1</td><td align="left">Class template <code class="code">linear_congruential_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.3.2</td><td align="left">Class template <code class="code">mersenne_twister_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.3.3</td><td align="left">Class template <code class="code">subtract_with_carry_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.4</td><td align="left">Random number engine adaptor class templates</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.4.2</td><td align="left">Class template <code class="code">discard_block_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.4.3</td><td align="left">Class template <code class="code">independent_bits_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.4.4</td><td align="left">Class template <code class="code">shuffle_order_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.5</td><td align="left">Engines and engine adaptors with predefined parameters</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.6</td><td align="left">Class <code class="code">random_device</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.7</td><td align="left">Utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.7.1</td><td align="left">Class <code class="code">seed_seq</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.7.2</td><td align="left">Function template <code class="code">generate_canonical</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8</td><td align="left">Random number distribution class templates</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.2</td><td align="left">Uniform distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.2.1</td><td align="left">Class template <code class="code">uniform_int_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.2.2</td><td align="left">Class template <code class="code">uniform_real_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3</td><td align="left">Bernoulli distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.1</td><td align="left">Class <code class="code">bernoulli_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.2</td><td align="left">Class template <code class="code">binomial_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.3</td><td align="left">Class template <code class="code">geometric_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.4</td><td align="left">Class template <code class="code">negative_binomial_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4</td><td align="left">Poisson distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.1</td><td align="left">Class template <code class="code">poisson_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.2</td><td align="left">Class template <code class="code">exponential_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.3</td><td align="left">Class template <code class="code">gamma_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.4</td><td align="left">Class template <code class="code">weibull_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.5</td><td align="left">Class template <code class="code">extreme_value_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5</td><td align="left">Normal distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.1</td><td align="left">Class template <code class="code">normal_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.2</td><td align="left">Class template <code class="code">lognormal_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.3</td><td align="left">Class template <code class="code">chi_squared_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.4</td><td align="left">Class template <code class="code">cauchy_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.5</td><td align="left">Class template <code class="code">fisher_f_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.6</td><td align="left">Class template <code class="code">student_t_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.6</td><td align="left">Sampling distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.6.1</td><td align="left">Class template <code class="code">discrete_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.6.2</td><td align="left">Class template <code class="code">piecewise_constant_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.6.3</td><td align="left">Class template <code class="code">piecewise_linear_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6</td><td align="left">Numeric arrays</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.6.1</td><td align="left">Header <code class="code"><valarray></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.2</td><td align="left">Class template <code class="code">valarray</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.3</td><td align="left"><code class="code">valarray</code> non-member operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.4</td><td align="left">Class <code class="code">slice</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.5</td><td align="left">Class template <code class="code">slice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.6</td><td align="left">The <code class="code">gslice</code> class</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.7</td><td align="left">Class template <code class="code">gslice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.8</td><td align="left">Class template <code class="code">mask_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.9</td><td align="left">Class template <code class="code">indirect_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.10</td><td align="left"><code class="code">valarray</code> range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7</td><td align="left">Generalized numeric operations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.7.1</td><td align="left">Header <code class="code"><numeric></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.2</td><td align="left">Accumulate></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.3</td><td align="left">Inner product</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.4</td><td align="left">Partial sum</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.5</td><td align="left">Adjacent difference</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.6</td><td align="left">Iota</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.8</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 205 <span class="emphasis"><em>27</em></span> 206 </td><td colspan="3" align="left"> 207 <span class="emphasis"><em>Input/output library</em></span> 208 </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">27.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4.1</td><td align="left">Overview</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4.2</td><td align="left">Narrow stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4.3</td><td align="left">Wide stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 209 <span class="emphasis"><em>28</em></span> 210 </td><td colspan="3" align="left"> 211 <span class="emphasis"><em>Regular expressions</em></span> 212 </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">28.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td><td align="left"> </td></tr><tr><td align="left">28.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 213 <span class="emphasis"><em>29</em></span> 214 </td><td colspan="3" align="left"> 215 <span class="emphasis"><em>Atomic operations</em></span> 216 </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.2</td><td align="left">Header <code class="code"><atomic></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.3</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.4</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.5</td><td align="left">Atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.6</td><td align="left">Operations on atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.7</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8</td><td align="left">Fences</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 217 <span class="emphasis"><em>30</em></span> 218 </td><td colspan="3" align="left"> 219 <span class="emphasis"><em>Thread support</em></span> 220 </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.3</td><td align="left">Threads</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.3.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">30.3.2</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4</td><td align="left">Mutual exclusion</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1</td><td align="left">Mutex requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2</td><td align="left">Mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3</td><td align="left">Timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2</td><td align="left">Locks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.2.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2.2</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.3</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.4</td><td align="left">Call once</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.4.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.4.4.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Broken</td><td align="left">See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR 221 66146</a> 222 </td></tr><tr><td align="left">30.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6</td><td align="left">Futures</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.1</td><td align="left">Overview</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.2</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.3</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.4</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.5</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.6</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.7</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.8</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.9</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 223 <span class="emphasis"><em>Appendix D</em></span> 224 </td><td colspan="3" align="left"> 225 <span class="emphasis"><em>Compatibility features</em></span> 226 </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with <code class="code">bool</code> operand</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">register</code> keyword</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.3</td><td align="left">Implicit declaration of copy functions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.4</td><td align="left">Dynamic exception specifications</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.8</td><td align="left">Function objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.9</td><td align="left">Binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.10</td><td align="left"><code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.11</td><td align="left">Violating exception-specifications</td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2011.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is also specified by the 1998 and 2003 standards, 227 see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation 228 Specific Behavior</a>. This section only documents behaviour which 229 is new in the 2011 standard. 230 </p><p> 231 <span class="emphasis"><em>17.6.5.12 [res.on.exception.handling]</em></span> 232 There are no implementation-defined exception classes, only standard 233 exception classes (or classes derived from them) will be thrown. 234 </p><p> 235 <span class="emphasis"><em>17.6.5.14 [value.error.codes]</em></span> 236 The <code class="classname">error_category</code> for errors originating outside 237 the OS, and the possible error code values for each error category, 238 should be documented here. 239 </p><p> 240 <span class="emphasis"><em>18.6.2.2 [new.badlength]</em></span> 241 <code class="function">what()</code> returns 242 <code class="literal">"std::bad_array_new_length"</code>. 243 </p><p> 244 <span class="emphasis"><em>20.6.9.1 [allocator.member]/5</em></span> 245 Over-aligned types are not supported by 246 <code class="classname">std::allocator</code>. 247 </p><p> 248 <span class="emphasis"><em>20.7.2.2.1 [util.smartptr.shared.const]</em></span> 249 When a <code class="classname">shared_ptr</code> constructor fails 250 <code class="classname">bad_alloc</code> (or types derived from it) will 251 be thrown, or when an allocator is passed to the constructor then any 252 exceptions thrown by the allocator. 253 </p><p> 254 <span class="emphasis"><em>20.7.2.0 [util.smartptr.weakptr]</em></span> 255 <code class="code">what()</code> returns <code class="literal">"bad_weak_ptr"</code>. 256 </p><p> 257 <span class="emphasis"><em>20.8.9.1.3 [func.bind.place]/1</em></span> There are 29 258 placeholders defined and the placeholder types are 259 <code class="literal">CopyAssignable</code>. 260 </p><p> 261 <span class="emphasis"><em>20.11.7.1 [time.clock.system]/3, /4</em></span> 262 Time point values are truncated to <code class="code">time_t</code> values. 263 There is no loss of precision for conversions in the other direction. 264 </p><p> 265 <span class="emphasis"><em>20.15.7 [meta.trans]/2</em></span> 266 <code class="classname">aligned_storage</code> does not support extended 267 alignment. 268 </p><p> 269 <span class="emphasis"><em>21.2.3.2 [char.traits.specializations.char16_t]</em></span>, 270 <span class="emphasis"><em>21.2.3.3 [char.traits.specializations.char32_t]</em></span> 271 The types <code class="classname">u16streampos</code> and 272 <code class="classname">u32streampos</code> are both synonyms for 273 <code class="classname">fpos<mbstate_t></code>. 274 The function <code class="function">eof</code> returns <code class="code">int_type(-1)</code>. 275 <code class="function">char_traits<char16_t>::to_int_type</code> will 276 transform the "noncharacter" U+FFFF to U+FFFD (REPLACEMENT CHARACTER). 277 This is done to ensure that <code class="function">to_int_type</code> never 278 returns the same value as <code class="function">eof</code>, which is U+FFFF. 279 </p><p> 280 <span class="emphasis"><em>22.3.1 [locale]</em></span> 281 There is one global locale for the whole program, not per-thread. 282 </p><p> 283 <span class="emphasis"><em>22.4.5.1.2 [locale.time.get.virtuals]</em></span>, 284 <span class="emphasis"><em>22.4.5.3.2 [locale.time.put.virtuals]</em></span> 285 Additional supported formats should be documented here. 286 </p><p> 287 <span class="emphasis"><em> 22.4.7.1.2 [locale.messages.virtuals]</em></span> 288 The mapping should be documented here. 289 </p><p> 290 <span class="emphasis"><em>23.3.2.1 [array.overview]</em></span> 291 <code class="classname">array<T, N>::iterator</code> is <code class="code">T*</code> and 292 <code class="classname">array<T, N>::const_iterator</code> is 293 <code class="code">const T*</code>. 294 </p><p> 295 <span class="emphasis"><em>23.5.4.2 [unord.map.cnstr]</em></span>, 296 <span class="emphasis"><em>23.5.5.2 [unord.multimap.cnstr]</em></span>, 297 <span class="emphasis"><em>23.5.6.2 [unord.set.cnstr]</em></span>, 298 <span class="emphasis"><em>23.5.7.2 [unord.multiset.cnstr]</em></span> 299 The default minimal bucket count is 0 for the default constructors, range 300 constructors and initializer-list constructors. 301 </p><p> 302 <span class="emphasis"><em>25.3.12 [alg.random.shuffle]</em></span> 303 The two-argument overload of <code class="function">random_shuffle</code> 304 uses <code class="function">rand</code> as the source of randomness. 305 </p><p> 306 <span class="emphasis"><em>26.5.5 [rand.predef]</em></span> 307 The type <code class="classname">default_random_engine</code> is a synonym for 308 <code class="classname">minstd_rand0</code>. 309 </p><p> 310 <span class="emphasis"><em> 26.5.6 [rand.device] </em></span> 311 The <code class="code">token</code> parameter of the 312 <code class="classname">random_device</code> constructor can be used to select 313 a specific source of random bytes. The valid token values are shown 314 in the list below. 315 The default constructor uses the token <code class="literal">"default"</code>. 316 </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">"default"</code></span></dt><dd> 317 Select the first available source from the other entries below. 318 This is the only token that is always valid. 319 </dd><dt><span class="term"><code class="literal">"rand_s"</code></span></dt><dd> 320 Use the MSVCRT <code class="function">rand_s</code> function. 321 This token is only valid for mingw-w64 targets. 322 </dd><dt><span class="term"><code class="literal">"rdseed"</code>, </span><span class="term"><code class="literal">"rdrand"</code> or <code class="literal">"rdrnd"</code></span></dt><dd> 323 Use the IA-32 <code class="literal">RDSEED</code> or <code class="literal">RDRAND</code> 324 instruction to read from an on-chip hardware random number generator. 325 These tokens are only valid for x86 and x86_64 targets when both 326 the assembler and CPU support the corresponding instruction. 327 </dd><dt><span class="term"><code class="literal">"/dev/urandom"</code>, </span><span class="term"><code class="literal">"/dev/random"</code></span></dt><dd> 328 Use the named character special file to read random bytes from. 329 These tokens are only valid when the device files are present 330 and readable by the current user. 331 </dd><dt><span class="term"><code class="literal">"mt19937"</code>, </span><span class="term">seed value</span></dt><dd> 332 When no source of nondeterministic random numbers is available a 333 <code class="classname">mersenne_twister_engine</code> will be used. 334 An integer seed value can be used as the token and will be converted 335 to an <code class="code">unsigned long</code> using <code class="function">strtoul</code>. 336 These tokens are only valid when no other source of random bytes 337 is available. 338 </dd></dl></div><p> 339 An exception of type <code class="classname">runtime_error</code> will be 340 thrown if a <code class="classname">random_device</code> object is constructed 341 with an invalid token, or if it cannot open or read from the source 342 of random bytes. 343 </p><p> 344 <span class="emphasis"><em>26.5.8.1 [rand.dist.general]</em></span> 345 The algorithms used by the distributions should be documented here. 346 </p><p> 347 <span class="emphasis"><em>26.8 [c.math]</em></span> Whether the 348 <code class="function">rand</code> function introduces data races depends on 349 the C library as the function is not provided by libstdc++. 350 </p><p> 351 <span class="emphasis"><em>27.8.2.1 [stringbuf.cons]</em></span> 352 Whether the sequence pointers are copied by the 353 <code class="classname">basic_stringbuf</code> move constructor should be 354 documented here. 355 </p><p> 356 <span class="emphasis"><em>27.9.1.2 [filebuf.cons]</em></span> 357 Whether the sequence pointers are copied by the 358 <code class="classname">basic_filebuf</code> move constructor should be 359 documented here. 360 </p><p> 361 <span class="emphasis"><em>28.5.1 [re.synopt]</em></span>, 362 <span class="emphasis"><em> 28.5.2 [re.matchflag] </em></span>, 363 <span class="emphasis"><em> 28.5.3 [re.err] </em></span> 364 <code class="code">syntax_option_type</code>, <code class="code">match_flag_type</code> 365 and <code class="code">error_type</code> are unscoped enumeration types. 366 </p><p> 367 <span class="emphasis"><em>28.7 [re.traits]</em></span> 368 The <code class="literal">blank</code> character class corresponds to the 369 <code class="code">ctype_base::blank</code> mask. 370 </p><p> 371 <span class="emphasis"><em>29.4 [atomics.lockfree]</em></span> 372 The values of the <code class="code">ATOMIC_xxx_LOCK_FREE</code> macros depend on 373 the target and cannot be listed here. 374 </p><p> 375 <span class="emphasis"><em>30.2.3 [thread.req.native]/1</em></span> 376 <code class="classname">native_handle_type</code> and 377 <code class="methodname">native_handle</code> are provided. The handle types 378 are defined in terms of the Gthreads abstraction layer, although this 379 is subject to change at any time. Any use of 380 <code class="classname">native_handle</code> is inherently non-portable and 381 not guaranteed to work between major releases of GCC. 382 </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="classname">thread</code></span></dt><dd> 383 The native handle type is a typedef for <code class="code">__gthread_t</code> 384 i.e. <code class="code">pthread_t</code> when GCC is configured with the 385 <code class="literal">posix</code> thread model. 386 The value of the native handle is undefined for a thread 387 which is not joinable. 388 </dd><dt><span class="term"><code class="classname">mutex</code>, </span><span class="term"><code class="classname">timed_mutex</code></span></dt><dd> 389 The native handle type is <code class="code">__gthread_mutex_t*</code> i.e. 390 <code class="code">pthread_mutex_t*</code> for the <code class="literal">posix</code> 391 thread model. 392 </dd><dt><span class="term"><code class="classname">recursive_mutex</code>, </span><span class="term"><code class="classname">recursive_timed_mutex</code></span></dt><dd> 393 The native handle type is <code class="code">__gthread_recursive_mutex_t*</code> 394 i.e. <code class="code">pthread_mutex_t*</code> for the <code class="literal">posix</code> 395 thread model. 396 </dd><dt><span class="term"><code class="classname">condition_variable</code></span></dt><dd> 397 The native handle type is <code class="code">__gthread_cond_t*</code> i.e. 398 <code class="code">pthread_cond_t*</code> for the <code class="literal">posix</code> 399 thread model. 400 </dd></dl></div><p> 401 </p><p> 402 <span class="emphasis"><em>30.6.1 [futures.overview]/2</em></span> 403 <code class="code">launch</code> is a scoped enumeration type with 404 overloaded operators to support bitmask operations. There are no 405 additional bitmask elements defined. 406 </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2014"></a>C++ 2014</h3></div></div></div><p> 407In this implementation the <code class="literal">-std=gnu++14</code> or 408<code class="literal">-std=c++14</code> flag must be used to enable language 409and library 410features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 411options. The pre-defined symbol 412<code class="constant">__cplusplus</code> is used to check for the 413presence of the required flag. 414GCC 6.1 was the first release with non-experimental C++14 support, 415so the API and ABI of features added in C++14 is only stable 416since that release. 417</p><p> 418This status table is based on the table of contents of ISO/IEC 14882:2014. 419Some subclauses are not shown in the table where the content is unchanged 420since C++11 and the implementation is complete. 421</p><p> 422This section describes the C++14 and library TS support in mainline GCC, 423not in any particular release. 424</p><div class="table"><a id="table.cxx14_status"></a><p class="title"><strong>Table 1.3. C++ 2014 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2014 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 425 <span class="emphasis"><em>18</em></span> 426 </td><td colspan="3" align="left"> 427 <span class="emphasis"><em>Language support</em></span> 428 </td></tr><tr><td align="left">18.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.2</td><td align="left">Types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3</td><td align="left">Implementation properties</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2</td><td align="left">Numeric Limits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2.3</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.2.4</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.5</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.6</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">18.3.2.7</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.3</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.4</td><td align="left">Integer types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.4.1</td><td align="left">Header <code class="code"><cstdint></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">18.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">18.6</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7</td><td align="left">Type identification</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.7.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.8.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.2</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.5</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.6</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9</td><td align="left">Initializer lists</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.9.1</td><td align="left">Initializer list constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.2</td><td align="left">Initializer list access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.3</td><td align="left">Initializer list range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 429 <span class="emphasis"><em>19</em></span> 430 </td><td colspan="3" align="left"> 431 <span class="emphasis"><em>Diagnostics</em></span> 432 </td></tr><tr><td align="left">19.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5</td><td align="left">System error support</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.5.1</td><td align="left">Class <code class="code">error_category</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.2</td><td align="left">Class <code class="code">error_code</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.3</td><td align="left">Class <code class="code">error_condition</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.4</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.5</td><td align="left">Class <code class="code">system_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 433 <span class="emphasis"><em>20</em></span> 434 </td><td colspan="3" align="left"> 435 <span class="emphasis"><em>General utilities</em></span> 436 </td></tr><tr><td align="left">20.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.2</td><td align="left">swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.3</td><td align="left">exchange</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.4</td><td align="left">forward/move helpers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.5</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4</td><td align="left">Tuples</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5</td><td align="left">Compile-time integer sequences</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.5.2</td><td align="left">Class template <code class="code">integer_sequence</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.3</td><td align="left">Alias template <code class="code">make_integer_sequence</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6</td><td align="left">Class template <code class="code">bitset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7</td><td align="left">Memory</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.1</td><td align="left">Default deleters</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.2</td><td align="left"><code class="code">unique_ptr</code> for single objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.3</td><td align="left"><code class="code">unique_ptr</code> for array objects with a runtime length</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.4</td><td align="left"><code class="code">unique_ptr</code> creation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.5</td><td align="left"><code class="code">unique_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2</td><td align="left">Shared-ownership pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.2.1</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.2</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left">Y</td><td align="left"> 437 Uses code from 438 <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>. 439 </td></tr><tr><td align="left">20.8.2.3</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.4</td><td align="left">Class template <code class="code">owner_less</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.5</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.6</td><td align="left"><code class="code">shared_ptr</code> atomic access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.7</td><td align="left">Smart pointer hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.1</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.2</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.3</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.5</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.6</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.8</td><td align="left">Negators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.9</td><td align="left">Function object binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.10</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.11</td><td align="left">Polymorphic function wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.11.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">20.9.11.2</td><td align="left">Class template <code class="code">function</code></td><td align="left">Partial</td><td align="left">Missing allocator support</td></tr><tr><td align="left">20.9.12</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10</td><td align="left">Metaprogramming and type traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.7</td><td align="left">Transformations between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11</td><td align="left">Compile-time rational arithmetic</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12</td><td align="left">Time utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.12.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.4</td><td align="left">Time-related traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.5.8</td><td align="left">Suffixes for duration literals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.7</td><td align="left">Clocks</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.8</td><td align="left">Date and time functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.13</td><td align="left">Scoped allocator adaptor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.14</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 440 <span class="emphasis"><em>21</em></span> 441 </td><td colspan="3" align="left"> 442 <span class="emphasis"><em>Strings</em></span> 443 </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">Character traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.5</td><td align="left">Numeric Conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.7</td><td align="left">Suffixes for <code class="code">basic_string</code> literals</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">21.7</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left"> 444 <span class="emphasis"><em>22</em></span> 445 </td><td colspan="3" align="left"> 446 <span class="emphasis"><em>Localization</em></span> 447 </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Header <code class="code"><locale></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.5</td><td align="left">Standard code conversion facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.6</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 448 <span class="emphasis"><em>23</em></span> 449 </td><td colspan="3" align="left"> 450 <span class="emphasis"><em>Containers</em></span> 451 </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6</td><td align="left">Container adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 452 <span class="emphasis"><em>24</em></span> 453 </td><td colspan="3" align="left"> 454 <span class="emphasis"><em>Iterators</em></span> 455 </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5</td><td align="left">Iterator adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6</td><td align="left">Stream iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.7</td><td align="left">range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 456 <span class="emphasis"><em>25</em></span> 457 </td><td colspan="3" align="left"> 458 <span class="emphasis"><em>Algorithms</em></span> 459 </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.5</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 460 <span class="emphasis"><em>26</em></span> 461 </td><td colspan="3" align="left"> 462 <span class="emphasis"><em>Numerics</em></span> 463 </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.10</td><td align="left">Suffixes for complex number literals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">Random number generation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6</td><td align="left">Numeric arrays</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7</td><td align="left">Generalized numeric operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.8</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 464 <span class="emphasis"><em>27</em></span> 465 </td><td colspan="3" align="left"> 466 <span class="emphasis"><em>Input/output library</em></span> 467 </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">27.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7.6</td><td align="left">Quoted manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 468 <span class="emphasis"><em>28</em></span> 469 </td><td colspan="3" align="left"> 470 <span class="emphasis"><em>Regular expressions</em></span> 471 </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">28.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td><td align="left"> </td></tr><tr><td align="left">28.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 472 <span class="emphasis"><em>29</em></span> 473 </td><td colspan="3" align="left"> 474 <span class="emphasis"><em>Atomic operations</em></span> 475 </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.2</td><td align="left">Header <code class="code"><atomic></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.3</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.4</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.5</td><td align="left">Atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.6</td><td align="left">Operations on atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.7</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8</td><td align="left">Fences</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 476 <span class="emphasis"><em>30</em></span> 477 </td><td colspan="3" align="left"> 478 <span class="emphasis"><em>Thread support</em></span> 479 </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.3</td><td align="left">Threads</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.3.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">30.3.2</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4</td><td align="left">Mutual exclusion</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1</td><td align="left">Mutex requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2</td><td align="left">Mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3</td><td align="left">Timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.4</td><td align="left">Shared timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.4.1</td><td align="left">Class <code class="code">shared_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2</td><td align="left">Locks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.2.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2.2</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2.3</td><td align="left">Class template <code class="code">shared_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.3</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.4</td><td align="left">Call once</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.4.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.4.4.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Broken</td><td align="left">See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR 480 66146</a> 481 </td></tr><tr><td align="left">30.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6</td><td align="left">Futures</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.1</td><td align="left">Overview</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.2</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.3</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.4</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.5</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.6</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.7</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.8</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.9</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 482 <span class="emphasis"><em>Appendix D</em></span> 483 </td><td colspan="3" align="left"> 484 <span class="emphasis"><em>Compatibility features</em></span> 485 </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with <code class="code">bool</code> operand</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">register</code> keyword</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.3</td><td align="left">Implicit declaration of copy functions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.4</td><td align="left">Dynamic exception specifications</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.8</td><td align="left">Function objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.9</td><td align="left">Binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.10</td><td align="left"><code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.11</td><td align="left">Violating exception-specifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.12</td><td align="left">Random shuffle</td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.ts_status"></a><p class="title"><strong>Table 1.4. C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr bgcolor="#C8B0B0"><td align="left"> 486 <a class="link" href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2013/n3662.html" target="_top"> 487 N3662 488 </a> 489 </td><td align="left">C++ Dynamic Arrays</td><td align="left">N</td><td align="left">Array Extensions TS</td></tr><tr><td align="left"> 490 <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3793.html" target="_top"> 491 N3793 492 </a> 493 </td><td align="left">A proposal to add a utility class to represent optional objects</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 494 <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3804.html" target="_top"> 495 N3804 496 </a> 497 </td><td align="left">Any library proposal</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr bgcolor="#C8B0B0"><td align="left"> 498 <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3866.html" target="_top"> 499 N3866 500 </a> 501 </td><td align="left">Invocation type traits, but dropping function_call_operator.</td><td align="left">N</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 502 <a class="link" href="" target="_top"> 503 N3905 504 </a> 505 </td><td align="left">Faster string searching (Boyer-Moore et al.)</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 506 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3915.pdf" target="_top"> 507 N3915 508 </a> 509 </td><td align="left">apply() call a function with arguments from a tuple</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr bgcolor="#B0B0B0"><td align="left"> 510 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3916.pdf" target="_top"> 511 N3916 512 </a> 513 </td><td align="left">Polymorphic memory resources</td><td align="left">Partial (missing pool resource and buffer resource classes)</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 514 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3920.html" target="_top"> 515 N3920 516 </a> 517 </td><td align="left">Extending shared_ptr to support arrays</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 518 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3921.html" target="_top"> 519 N3921 520 </a> 521 </td><td align="left"><code class="code">string_view</code>: a non-owning reference to a string</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 522 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3925.pdf" target="_top"> 523 N3925 524 </a> 525 </td><td align="left">A sample proposal</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 526 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3932.htm" target="_top"> 527 N3932 528 </a> 529 </td><td align="left">Variable Templates For Type Traits</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 530 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4100.pdf" target="_top"> 531 N4100 532 </a> 533 </td><td align="left">File System</td><td align="left">Y</td><td align="left"> 534 Link with 535 <a class="link" href="using_dynamic_or_shared.html#manual.intro.using.linkage.experimental" title="Experimental Library Extensions"> 536 <code class="option">-lstdc++fs</code></a> 537 </td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2014.specific"></a>Implementation Specific Behavior</h4></div></div></div><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="iso.2014.filesystemts"></a>Filesystem TS</h5></div></div></div><p> 538 <span class="emphasis"><em>2.1 POSIX conformance [fs.conform.9945]</em></span> 539 The behavior of the filesystem library implementation will depend on 540 the target operating system. Some features will not be supported 541 on some targets. Symbolic links and file permissions 542 are not supported on Windows. 543 </p><p> 544 <span class="emphasis"><em>15.30 Rename [fs.op.rename]</em></span> 545 On Windows, <code class="code">experimental::filesystem::rename</code> 546 is implemented by calling <code class="code">MoveFileExW</code> and so 547 does not meet the requirements of POSIX <code class="code">rename</code> 548 when one or both of the paths resolves to an existing directory. 549 Specifically, it is possible to rename a directory so it replaces 550 a non-directory (POSIX requires an error in that case), 551 and it is not possible to rename a directory to replace another 552 directory (POSIX requires that to work if the directory being 553 replaced is empty). 554 </p></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2017"></a>C++ 2017</h3></div></div></div><p> 555In this implementation the <code class="literal">-std=gnu++17</code> or 556<code class="literal">-std=c++17</code> flag must be used to enable language 557and library 558features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 559options. The pre-defined symbol 560<code class="constant">__cplusplus</code> is used to check for the 561presence of the required flag. 562GCC 9.1 was the first release with non-experimental C++17 support, 563so the API and ABI of features added in C++17 is only stable 564since that release. 565</p><p> 566This section describes the C++17 and library TS support in mainline GCC, 567not in any particular release. 568</p><p> 569The following table lists new library features that are included in 570the C++17 standard. The "Proposal" column provides a link to the 571ISO C++ committee proposal that describes the feature, while the "Status" 572column indicates the first version of GCC that contains an implementation of 573this feature (if it has been implemented). 574The "SD-6 Feature Test" column shows the corresponding macro or header from 575<a class="link" href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_top">SD-6: 576Feature-testing recommendations for C++</a>. 577</p><div class="table"><a id="table.cxx17_features"></a><p class="title"><strong>Table 1.5. C++ 2017 Library Features</strong></p><div class="table-contents"><table class="table" summary="C++ 2017 Library Features" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Library Feature</th><th align="left">Proposal</th><th align="left">Status</th><th align="left">SD-6 Feature Test</th></tr></thead><tbody><tr bgcolor="#C8B0B0"><td align="left"> 578 <code class="code">constexpr std::hardware_{constructive,destructive}_interference_size</code> 579 </td><td align="left"> 580 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0154r1.html" target="_top"> 581 P0154R1 582 </a> 583 </td><td align="center"> No </td><td align="left"> <code class="code">__cpp_lib_hardware_interference_size >= 201603</code> </td></tr><tr><td align="left"> Core Issue 1776: Replacement of class objects containing reference members</td><td align="left"> 584 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0137r1.html" target="_top"> 585 P0137R1 586 </a> 587 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_launder >= 201606</code> </td></tr><tr><td align="left">Wording for <code class="code">std::uncaught_exceptions</code></td><td align="left"> 588 <a class="link" href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n4259.pdf" target="_top"> 589 N4259 590 </a> 591 </td><td align="center">6.1</td><td align="left"><code class="code">__cpp_lib_uncaught_exceptions >= 201411</code></td></tr><tr><td align="left"> C++17 should refer to C11 instead of C99 </td><td align="left"> 592 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0063r3.html" target="_top"> 593 P0063R3 594 </a> 595 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> Variant: a type-safe union for C++17 </td><td align="left"> 596 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0088r3.html" target="_top"> 597 P0088R3 598 </a> 599 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<variant>)</code>, 600 <code class="code">__cpp_lib_variant >= 201603</code> 601 (since 7.3, see Note 1) 602 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">optional</code> </td><td align="left"> 603 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 604 P0220R1 605 </a> 606 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<optional>)</code>, 607 <code class="code">__cpp_lib_optional >= 201603</code> 608 (since 7.3, see Note 1) 609 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">any</code> </td><td align="left"> 610 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 611 P0220R1 612 </a> 613 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<any>)</code>, 614 <code class="code">__cpp_lib_any >= 201603</code> 615 (since 7.3, see Note 1) 616 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">string_view</code> </td><td align="left"> 617 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 618 P0220R1 619 </a> 620 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<string_view>)</code>, 621 <code class="code">__cpp_lib_string_view >= 201603</code> 622 (since 7.3, see Note 1) 623 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">memory_resource</code> </td><td align="left"> 624 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 625 P0220R1 626 </a> 627 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__has_include(<memory_resource>)</code>, 628 <code class="code">__cpp_lib_memory_resource >= 201603</code> 629 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">apply</code> </td><td align="left"> 630 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 631 P0220R1 632 </a> 633 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_apply >= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">shared_ptr<T[]></code> </td><td align="left"> 634 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 635 P0220R1 636 </a> 637 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_shared_ptr_arrays >= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: Searchers </td><td align="left"> 638 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 639 P0220R1 640 </a> 641 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_boyer_moore_searcher >= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: Sampling </td><td align="left"> 642 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 643 P0220R1 644 </a> 645 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_sample >= 201603</code> </td></tr><tr><td align="left"> Constant View: A proposal for a <code class="code">std::as_const</code> helper function template </td><td align="left"> 646 <a class="link" href="" target="_top"> 647 P0007R1 648 </a> 649 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_as_const >= 201510 </code></td></tr><tr><td align="left"> Improving pair and tuple </td><td align="left"> 650 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4387" target="_top"> 651 N4387 652 </a> 653 </td><td align="center"> 6.1 </td><td align="left"> N/A </td></tr><tr><td align="left"> <code class="code">make_from_tuple</code>: apply for construction </td><td align="left"> 654 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0209r2.pdf" target="_top"> 655 P0209R2 656 </a> 657 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_make_from_tuple >= 201606 </code></td></tr><tr bgcolor="#C8B0B0"><td align="left"> 658 Removing <code class="code">auto_ptr</code>, <code class="code">random_shuffle()</code>, 659 And Old <code class="code"><functional></code> Stuff 660 </td><td align="left"> 661 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4190.htm" target="_top"> 662 N4190 663 </a> 664 </td><td align="center">No (kept for backwards compatibility)</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Deprecating Vestigial Library Parts in C++17 </td><td align="left"> 665 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0174r2.html" target="_top"> 666 P0174R2 667 </a> 668 </td><td align="center"> No (kept for backwards compatibility)</td><td align="left"> </td></tr><tr><td align="left"> Making <code class="code">std::owner_less</code> more flexible </td><td align="left"> 669 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0074r0.html" target="_top"> 670 P0074R0 671 </a> 672 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_transparent_operators >= 201510 </code></td></tr><tr><td align="left"> <code class="code">std::addressof</code> should be constexpr </td><td align="left"> 673 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0304r0.html#2296" target="_top"> 674 LWG2296 675 </a> 676 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_addressof_constexpr >= 201603 </code></td></tr><tr><td align="left"> Safe conversions in <code class="code">unique_ptr<T[]></code> </td><td align="left"> 677 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4089.pdf" target="_top"> 678 N4089 679 </a> 680 </td><td align="center"> 6 </td><td align="left"> </td></tr><tr><td align="left"> LWG 2228: Missing SFINAE rule in unique_ptr templated assignment </td><td align="left"> 681 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4366.html" target="_top"> 682 N4366 683 </a> 684 </td><td align="center"> 6 </td><td align="left"> </td></tr><tr><td align="left"> Re-enabling <code class="code">shared_from_this</code></td><td align="left"> 685 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0033r1.html" target="_top"> 686 P0033R1 687 </a> 688 </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_enable_shared_from_this >= 201603</code></td></tr><tr><td align="left"> A proposal to add <code class="code">invoke</code> function template </td><td align="left"> 689 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169.html" target="_top"> 690 N4169 691 </a> 692 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_invoke >= 201411 </code></td></tr><tr><td align="left">TriviallyCopyable <code class="code">reference_wrapper</code> </td><td align="left"> 693 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4277.html" target="_top"> 694 N4277 695 </a> 696 </td><td align="center"> 5.1 </td><td align="left"> </td></tr><tr><td align="left"> Adopt <code class="code">not_fn</code> from Library Fundamentals 2 for C++17 </td><td align="left"> 697 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0005r4.html" target="_top"> 698 P0005R4 699 </a> 700 </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_not_fn >= 201603</code></td></tr><tr><td align="left"> Fixes for <code class="code">not_fn</code> </td><td align="left"> 701 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0358r1.html" target="_top"> 702 P0358R1 703 </a> 704 </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left"> Fixing a design mistake in the searchers interface in Library Fundamentals </td><td align="left"> 705 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0253r1.pdf" target="_top"> 706 P0253R1 707 </a> 708 </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left"> Extending memory management tools </td><td align="left"> 709 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0040r3.html" target="_top"> 710 P0040R3 711 </a> 712 </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_raw_memory_algorithms >= 201606L</code></td></tr><tr><td align="left"> <code class="code">shared_ptr::weak_type</code></td><td align="left"> 713 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0163r0.html" target="_top"> 714 P0163R0 715 </a> 716 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_shared_ptr_weak_type >= 201606</code></td></tr><tr><td align="left">Transformation Trait Alias <code class="code">void_t</code></td><td align="left"> 717 <a class="link" href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n3911.pdf" target="_top"> 718 N3911 719 </a> 720 </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_void_t >= 201411</code></td></tr><tr><td align="left"> Wording for <code class="code">bool_constant</code>, revision 1 </td><td align="left"> 721 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4389.html" target="_top"> 722 N4389 723 </a> 724 </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_bool_constant >= 201505</code></td></tr><tr><td align="left"> Adopt Type Traits Variable Templates from Library Fundamentals TS for C++17</td><td align="left"> 725 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0006r0.html" target="_top"> 726 P0006R0 727 </a> 728 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_type_trait_variable_templates >= 201510 </code></td></tr><tr><td align="left"> Logical Operator Type Traits</td><td align="left"> 729 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0013r1.html" target="_top"> 730 P0013R1 731 </a> 732 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_logical_traits >= 201510 </code></td></tr><tr><td align="left"> Adding [nothrow-]swappable traits </td><td align="left"> 733 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0185r1.html" target="_top"> 734 P0185R1 735 </a> 736 </td><td align="center"> 7 (<code class="code">__is_swappable</code> available since 6.1)</td><td align="left"><code class="code"> __cpp_lib_is_swappable >= 201603 </code></td></tr><tr><td align="left"> <code class="code">is_callable</code>, the missing INVOKE related trait</td><td align="left"> 737 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0077r2.html" target="_top"> 738 P0077R2 739 </a> 740 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_is_invocable >= 201703 </code></td></tr><tr><td align="left"> has_unique_object_representations </td><td align="left"> 741 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0258r2.html" target="_top"> 742 P0258R2 743 </a> 744 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_has_unique_object_representations >= 201606 </code></td></tr><tr><td align="left"> Polishing <code class="code"><chrono></code> </td><td align="left"> 745 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0092r1.html" target="_top"> 746 P0092R1 747 </a> 748 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_chrono >= 201510 </code></td></tr><tr><td align="left"> Adding more constexpr to <code class="code"><chrono></code> </td><td align="left"> 749 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0505r0.html" target="_top"> 750 P0505R0 751 </a> 752 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_chrono >= 201611 </code> 753 (since 7.3, see Note 2) 754 </td></tr><tr><td align="left"> Constexpr for <code class="code">std::char_traits</code> </td><td align="left"> 755 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0426r1.html" target="_top"> 756 P0426R1 757 </a> 758 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_constexpr_char_traits >= 201611 </code></td></tr><tr><td align="left"> Integrating <code class="code">std::string_view</code> and <code class="code">std::string</code> </td><td align="left"> 759 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0254r2.pdf" target="_top"> 760 P0254R2 761 </a> 762 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> </code></td></tr><tr><td align="left"> Give 'std::string' a non-const '.data()' member function </td><td align="left"> 763 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0272r1.html" target="_top"> 764 P0272R1 765 </a> 766 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> </code></td></tr><tr><td align="left">Cleaning-up noexcept in the Library</td><td align="left"> 767 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4258.pdf" target="_top"> 768 N4258 769 </a> 770 </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_allocator_traits_is_always_equal >= 201411 </code></td></tr><tr><td align="left">Contiguous Iterators </td><td align="left"> 771 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4284.html" target="_top"> 772 N4284 773 </a> 774 </td><td align="center">N/A</td><td align="left"> </td></tr><tr><td align="left"> Minimal incomplete type support for standard containers </td><td align="left"> 775 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4510.html" target="_top"> 776 N4510 777 </a> 778 </td><td align="center"> 3.0 </td><td align="left"><code class="code"> __cpp_lib_incomplete_container_elements >= 201505 </code> 779 (since 6.2, see Note 2) 780 </td></tr><tr><td align="left"> Emplace return type </td><td align="left"> 781 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r2.pdf" target="_top"> 782 P0084R2 783 </a> 784 </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left">Improved insertion interface for unique-key maps</td><td align="left"> 785 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4279.html" target="_top"> 786 N4279 787 </a> 788 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_map_try_emplace >= 201411</code>, 789 <code class="code"> __cpp_lib_unordered_map_try_emplace >= 201411</code> 790 </td></tr><tr><td align="left"> Splicing Maps and Sets </td><td align="left"> 791 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0083r3.pdf" target="_top"> 792 P0083R3 793 </a> 794 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_node_extract >= 201606 </code></td></tr><tr><td align="left">Non-member <code class="code">size()</code> and more</td><td align="left"> 795 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4280.pdf" target="_top"> 796 N4280 797 </a> 798 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_nonmember_container_access >= 201411 </code></td></tr><tr><td align="left"> A Proposal to Add Constexpr Modifiers to <code class="code">reverse_iterator</code>, <code class="code">move_iterator</code>, <code class="code">array</code> and Range Access </td><td align="left"> 799 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0031r0.html" target="_top"> 800 P0031R0 801 </a> 802 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_array_constexpr >= 201603 </code></td></tr><tr bgcolor="#B0B0B0"><td align="left"> The Parallelism TS Should be Standardized </td><td align="left"> 803 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0024r2.html" target="_top"> 804 P0024R2 805 </a> 806 </td><td align="center"> 9.1 </td><td align="left"><code class="code"> __has_include(<execution>) </code>, 807 <code class="code"> __cpp_lib_execution >= 201603 </code>, 808 <code class="code"> __cpp_lib_parallel_algorithm >= 201603 </code> 809 (requires linking with <code class="code">-ltbb</code>, see Note 3) 810 </td></tr><tr><td align="left"> An algorithm to "clamp" a value between a pair of boundary values </td><td align="left"> 811 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0025r0.html" target="_top"> 812 P0025R0 813 </a> 814 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_clamp >= 201603 </code></td></tr><tr><td align="left"> Adopt Selected Library Fundamentals V2 Components for C++17 </td><td align="left"> 815 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0295r0.pdf" target="_top"> 816 P0295R0 817 </a> 818 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_gcd_lcm >= 201606 </code></td></tr><tr><td align="left"> Proposal to Introduce a 3-Argument Overload to <code class="code">std::hypot</code> </td><td align="left"> 819 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0030r1.pdf" target="_top"> 820 P0030R1 821 </a> 822 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_hypot >= 201603 </code></td></tr><tr><td align="left"> Mathematical Special Functions for C++17 </td><td align="left"> 823 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0226r1.pdf" target="_top"> 824 P0226R1 825 </a> 826 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_math_special_functions >= 201603 </code> 827 (see Note 4) 828 </td></tr><tr><td align="left">Adopt the File System TS for C++17 </td><td align="left"> 829 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0218r1.html" target="_top"> 830 P0218R1 831 </a> 832 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __has_include(<filesystem>) </code>, 833 <code class="code"> __cpp_lib_filesystem >= 201603 </code> 834 (GCC 8.x requires linking with <code class="code">-lstdc++fs</code>) 835 </td></tr><tr><td align="left"> Relative Paths for Filesystem</td><td align="left"> 836 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0219r1.html" target="_top"> 837 P0219R1 838 </a> 839 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem >= 201606 </code></td></tr><tr><td align="left"> Adapting string_view by filesystem paths </td><td align="left"> 840 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0392r0.pdf" target="_top"> 841 P0392R0 842 </a> 843 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem >= 201606 </code></td></tr><tr><td align="left"> Directory Entry Caching for Filesystem </td><td align="left"> 844 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0317r1.html" target="_top"> 845 P0317R1 846 </a> 847 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem >= 201703 </code></td></tr><tr><td align="left"> constexpr <code class="code">atomic<T>::is_always_lock_free</code> </td><td align="left"> 848 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0152r1.html" target="_top"> 849 P0152R1 850 </a> 851 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_atomic_is_always_lock_free >= 201603 </code></td></tr><tr><td align="left">A proposal to add <code class="code">shared_mutex</code> (untimed) (Revision 4)</td><td align="left"> 852 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4508.html" target="_top"> 853 N4508 854 </a> 855 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_shared_mutex >= 201505 </code></td></tr><tr><td align="left"> Variadic <code class="code">lock_guard</code> (Rev. 5) </td><td align="left"> 856 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0156r2.html" target="_top"> 857 P0156R2 858 </a> 859 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_scoped_lock >= 201703 </code></td></tr><tr><td align="left"> A byte type definition </td><td align="left"> 860 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0298r3.pdf" target="_top"> 861 P0298R3 862 </a> 863 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_byte >= 201603 </code> (since 7.3, see Note 2) 864 </td></tr><tr bgcolor="#B0B0B0"><td align="left"> Elementary string conversions </td><td align="left"> 865 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0067r5.html" target="_top"> 866 P0067R5 867 </a> 868 </td><td align="center"> 8.1 (only integral types supported) </td><td align="left"><code class="code"> __has_include(<charconv>) </code> 869 <code class="code"> __cpp_lib_to_chars >= 201611 </code></td></tr><tr><td align="left"> Homogeneous interface for variant, any and optional </td><td align="left"> 870 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0032r3.pdf" target="_top"> 871 P0032R3 872 </a> 873 </td><td align="center"> 7.1 </td><td align="left"> 874 <code class="code"> __cpp_lib_any >= 201606 </code>, 875 <code class="code"> __cpp_lib_optional >= 201606 </code>, 876 <code class="code"> __cpp_lib_variant >= 201606 </code> 877 </td></tr><tr><td align="left"> Making Optional Greater Equal Again </td><td align="left"> 878 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0307r2.pdf" target="_top"> 879 P0307R2 880 </a> 881 </td><td align="center"> 7.1 </td><td align="left"> <code class="code"> __cpp_lib_optional >= 201606 </code> </td></tr></tbody></table></div></div><br class="table-break" /><p> 882Note 1: This feature is supported in GCC 7.1 and 7.2 but before GCC 7.3 the 883<code class="code">__cpp_lib</code> macro is not defined, and compilation will fail if the 884header is included without using <code class="option">-std</code> to enable C++17 support. 885</p><p> 886Note 2: This feature is supported in older releases but the 887<code class="code">__cpp_lib</code> macro is not defined to the right value 888(or not defined at all) until the version shown in parentheses. 889</p><p> 890Note 3: The Parallel Algorithms have an external dependency on Intel TBB 2018 891or later. If the <code class="filename"><execution></code> 892header is included then <code class="code">-ltbb</code> must be used to link to TBB. 893</p><p> 894Note 4: The mathematical special functions are enabled in C++17 mode from 895GCC 7.1 onwards. For GCC 6.x or for C++11/C++14 define 896<code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code> to a non-zero value 897and test for <code class="code">__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>. 898</p><p> 899The following status table is based on the table of contents of 900ISO/IEC 14882:2017. 901Some subclauses are not shown in the table where the content is unchanged 902since C++14 and the implementation is complete. 903</p><div class="table"><a id="table.cxx17_status"></a><p class="title"><strong>Table 1.6. C++ 2017 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2017 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 904 <span class="emphasis"><em>21</em></span> 905 </td><td colspan="3" align="left"> 906 <span class="emphasis"><em>Language support</em></span> 907 </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">Common definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">Implementation properties</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3.2</td><td align="left">Header <code class="code"><limits></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3.3</td><td align="left">Floating-point type properties</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">21.3.3.1</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">21.3.3.2</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">21.3.4</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3.5</td><td align="left">Header <code class="code"><climits></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3.6</td><td align="left">Header <code class="code"><cfloat></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Integer types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.4.1</td><td align="left">Header <code class="code"><cstdint></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">21.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">21.6</td><td align="left">Dynamic memory management</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.6.1</td><td align="left">Header <code class="code"><new></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.6.2</td><td align="left">Storage allocation and deallocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6.3</td><td align="left">Storage allocation errors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6.4</td><td align="left">Pointer optimization barrier</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">21.6.5</td><td align="left">Hardware interference size</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">21.7</td><td align="left">Type identification</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.8.1</td><td align="left">Header <code class="code"><exception></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.8.2</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.3</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.4</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.5</td><td align="left"><code class="code">uncaught_exceptions</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.6</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.7</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.9</td><td align="left">Initializer lists</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 908 <span class="emphasis"><em>22</em></span> 909 </td><td colspan="3" align="left"> 910 <span class="emphasis"><em>Diagnostics</em></span> 911 </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.5</td><td align="left">System error support</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left"> 912 <span class="emphasis"><em>23</em></span> 913 </td><td colspan="3" align="left"> 914 <span class="emphasis"><em>General utilities</em></span> 915 </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.1</td><td align="left">Header <code class="code"><utility></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.2</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3</td><td align="left"><code class="code">swap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.4</td><td align="left"><code class="code">exchange</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.5</td><td align="left">Forward/move helpers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.6</td><td align="left">Function template <code class="code">as_const</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.7</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">23.2.8</td><td align="left">Primitive numeric output conversion</td><td align="left">Partial</td><td align="left">Only integer types supported, not floating-point types</td></tr><tr bgcolor="#B0B0B0"><td align="left">23.2.9</td><td align="left">Primitive numeric input conversion</td><td align="left">Partial</td><td align="left">Only integer types supported, not floating-point types</td></tr><tr><td align="left">23.3</td><td align="left">Compile-time integer sequences</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.4</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5</td><td align="left">Tuples</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6</td><td align="left">Optional objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.7</td><td align="left">Variants</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.8</td><td align="left">Storage for any type</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.9</td><td align="left">Bitsets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10</td><td align="left">Memory</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.10.2</td><td align="left">Header <code class="code"><memory></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.3</td><td align="left">Pointer traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.4</td><td align="left">Pointer safety</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.5</td><td align="left">Align</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.6</td><td align="left">Allocator argument tag</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.7</td><td align="left"><code class="code">uses_allocator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.8</td><td align="left">Allocator traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.10</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.11</td><td align="left">C library memory allocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.11</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.11.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.11.2</td><td align="left">Shared-ownership pointers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12</td><td align="left">Memory resources</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.12.1</td><td align="left">Header <code class="code"><memory_resource></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.2</td><td align="left">Class <code class="code">memory_resource</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.3</td><td align="left">Class template <code class="code">polymorphic_allocator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.4</td><td align="left">Access to program-wide <code class="code">memory_resource</code> objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.5</td><td align="left">Pool resource classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.6</td><td align="left">Class <code class="code">monotonic_buffer_resource</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.13</td><td align="left">Class template <code class="code">scoped_allocator_adaptor</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.1</td><td align="left">Header <code class="code"><functional></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.2</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.3</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.4</td><td align="left">Function template <code class="code">invoke</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.5</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.6</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.7</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.8</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.9</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.10</td><td align="left">Function template <code class="code">not_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.11</td><td align="left">Function object binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.12</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.13</td><td align="left">Polymorphic function wrappers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.14</td><td align="left">Searchers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.15</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15</td><td align="left">Metaprogramming and type traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.15.1</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.15.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.7</td><td align="left">Transformations between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.8</td><td align="left">Logical operator traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.16</td><td align="left">Compile-time rational arithmetic</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.17.2</td><td align="left">Header <code class="code"><chrono></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.17</td><td align="left">Time utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.17.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.4</td><td align="left">Time-related traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.7</td><td align="left">Clocks</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.8</td><td align="left">Header <code class="code"><ctime></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.18</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19</td><td align="left">Execution policies</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.19.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.19.2</td><td align="left">Header <code class="code"><execution></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.19.3</td><td align="left">Execution policy type trait</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.4</td><td align="left">Sequenced execution policy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.5</td><td align="left">Parallel execution policy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.6</td><td align="left">Parallel and unsequenced execution policy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.7</td><td align="left">Execution policy objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 916 <span class="emphasis"><em>24</em></span> 917 </td><td colspan="3" align="left"> 918 <span class="emphasis"><em>Strings</em></span> 919 </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Character traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">String view classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.1</td><td align="left">Header <code class="code"><string_view></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.2</td><td align="left">Class template <code class="code">basic_string_view</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.3</td><td align="left">Non-member comparison functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.4</td><td align="left">Inserters and extractors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.5</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.6</td><td align="left">Suffix for <code class="code">basic_string_view</code> literals</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">24.5</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left"> 920 <span class="emphasis"><em>25</em></span> 921 </td><td colspan="3" align="left"> 922 <span class="emphasis"><em>Localization</em></span> 923 </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Header <code class="code"><locale></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.5</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 924 <span class="emphasis"><em>26</em></span> 925 </td><td colspan="3" align="left"> 926 <span class="emphasis"><em>Containers</em></span> 927 </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6</td><td align="left">Container adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 928 <span class="emphasis"><em>27</em></span> 929 </td><td colspan="3" align="left"> 930 <span class="emphasis"><em>Iterators</em></span> 931 </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Iterator adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Stream iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">Range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">Container access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 932 <span class="emphasis"><em>28</em></span> 933 </td><td colspan="3" align="left"> 934 <span class="emphasis"><em>Algorithms</em></span> 935 </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">28.2</td><td align="left">Header <code class="code"><algorithm></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">28.3</td><td align="left">Algorithms requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">28.4</td><td align="left">Parallel algorithms</td><td align="left"> </td><td align="left">Using <a class="link" href="https://github.com/intel/parallelstl" target="_top">PSTL</a></td></tr><tr><td align="left">28.5</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.6</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.7</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.8</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 936 <span class="emphasis"><em>29</em></span> 937 </td><td colspan="3" align="left"> 938 <span class="emphasis"><em>Numerics</em></span> 939 </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.2</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.3</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.4</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.5</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.6</td><td align="left">Random number generation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.7</td><td align="left">Numeric arrays</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8</td><td align="left">Generalized numeric operations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.8.1</td><td align="left">Header <code class="code"><numeric></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.8.2</td><td align="left">Accumulate</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.3</td><td align="left">Reduce</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.4</td><td align="left">Inner product</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.5</td><td align="left">Transform reduce</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.6</td><td align="left">Partial sum</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.7</td><td align="left">Exclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.8</td><td align="left">Inclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.9</td><td align="left">Transform exclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.10</td><td align="left">Transform inclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.11</td><td align="left">Adjacent difference</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.12</td><td align="left">Iota</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.13</td><td align="left">Greatest common divisor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.14</td><td align="left">Least common multiple</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9</td><td align="left">Mathematical functions for floating-point types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.9.1</td><td align="left">Header <code class="code"><cmath></code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.9.2</td><td align="left">Absolute values</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9.3</td><td align="left">Three-dimensional hypotenuse</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9.4</td><td align="left">Classification / comparison functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9.5</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 940 <span class="emphasis"><em>30</em></span> 941 </td><td colspan="3" align="left"> 942 <span class="emphasis"><em>Input/output library</em></span> 943 </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"> </td></tr><tr><td align="left">30.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.10</td><td align="left">File systemss</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.11</td><td align="left">C library files</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 944 <span class="emphasis"><em>31</em></span> 945 </td><td colspan="3" align="left"> 946 <span class="emphasis"><em>Regular expressions</em></span> 947 </td></tr><tr><td align="left">31.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">31.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td><td align="left"> </td></tr><tr><td align="left">31.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 948 <span class="emphasis"><em>32</em></span> 949 </td><td colspan="3" align="left"> 950 <span class="emphasis"><em>Atomic operations</em></span> 951 </td></tr><tr><td align="left">32.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.2</td><td align="left">Header <code class="code"><atomic></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.3</td><td align="left">Type aliases</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.4</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.5</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.6</td><td align="left">Class template <code class="code"><atomic></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.7</td><td align="left">Non-member functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.8</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.9</td><td align="left">Fences</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 952 <span class="emphasis"><em>33</em></span> 953 </td><td colspan="3" align="left"> 954 <span class="emphasis"><em>Thread support</em></span> 955 </td></tr><tr><td align="left">33.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.3</td><td align="left">Threads</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.3.1</td><td align="left">Header <code class="code">thread</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.3.2</td><td align="left">Class <code class="code">thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">33.3.2.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">33.3.3</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4</td><td align="left">Mutual exclusion</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3</td><td align="left">Mutex requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.2</td><td align="left">Mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.3</td><td align="left">Timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.4</td><td align="left">Shared mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.4.1</td><td align="left">Class <code class="code">shared_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.5</td><td align="left">Shared timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.5.1</td><td align="left">Class <code class="code">shared_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4</td><td align="left">Locks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.4.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4.2</td><td align="left">Class template <code class="code">scoped_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4.3</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4.4</td><td align="left">Class template <code class="code">shared_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.5</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.6</td><td align="left">Call once</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.6.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">33.4.6.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Broken</td><td align="left">See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR 956 66146</a> 957 </td></tr><tr><td align="left">33.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6</td><td align="left">Futures</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.6.1</td><td align="left">Overview</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.6.2</td><td align="left">Header <code class="code"><future></code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.6.3</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.4</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.5</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.6</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.7</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.8</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.9</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.10</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"> 958 <span class="emphasis"><em>Appendix D</em></span> 959 </td><td colspan="3" align="left"> 960 <span class="emphasis"><em>Compatibility features</em></span> 961 </td></tr><tr><td align="left">D.4</td><td align="left">C++ standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><ccomplex></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><cstdalign></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><cstdbool></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><ctgmath></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.8</td><td align="left">Old adaptable function bindings</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.10</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.11</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.12</td><td align="left">Deprecated type traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.13</td><td align="left">Deprecated iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.14</td><td align="left">Deprecated <code class="code">shared_ptr</code> observers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.15</td><td align="left">Deprecated standard code conversion facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.16</td><td align="left">Deprecated convenience conversion interfaces</td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.cxx17_ts_status"></a><p class="title"><strong>Table 1.7. C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 962 <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4076.html" target="_top"> 963 N4076 964 </a> 965 </td><td align="left">A generalized callable negator</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 966 <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4273.htm" target="_top"> 967 N4273 968 </a> 969 </td><td align="left">Uniform Container Erasure</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 970 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4061.pdf" target="_top"> 971 N4061 972 </a> 973 </td><td align="left">Greatest Common Divisor and Least Common Multiple</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 974 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4066.htm" target="_top"> 975 N4066 976 </a> 977 </td><td align="left">Delimited iterators</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 978 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4282.pdf" target="_top"> 979 N4282 980 </a> 981 </td><td align="left">The World's Dumbest Smart Pointer</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 982 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4388.html" target="_top"> 983 N4388 984 </a> 985 </td><td align="left">Const-Propagating Wrapper</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 986 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4391.html" target="_top"> 987 N4391 988 </a> 989 </td><td align="left"> <code class="code">make_array</code>, revision 4 </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 990 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4502.pdf" target="_top"> 991 N4502 992 </a> 993 </td><td align="left"> Support for the C++ Detection Idiom, V2 </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 994 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4519.pdf" target="_top"> 995 N4519 996 </a> 997 </td><td align="left"> Source-Code Information Capture </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr bgcolor="#C8B0B0"><td align="left"> 998 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4521.html" target="_top"> 999 N4521 1000 </a> 1001 </td><td align="left"> Merge Fundamentals V1 into V2 </td><td align="left"> 1002 N (components from V1 are still in namespace 1003 <code class="code">fundamentals_v1</code>) 1004 </td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1005 <a class="link" href="http://open-std.org/JTC1/SC22/WG21/docs/papers/2015/p0013r1.html" target="_top"> 1006 P0013R1 1007 </a> 1008 </td><td align="left">Logical Operator Type Traits (revision 1)</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1009 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4531.html" target="_top"> 1010 N4531 1011 </a> 1012 </td><td align="left">std::rand replacement, revision 3</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2017.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is also specified by previous standards, 1013 see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation 1014 Specific Behavior</a> and <a class="link" href="status.html#iso.2011.specific" title="Implementation Specific Behavior">C++ 1015 2011 Implementation Specific Behavior</a>. This section only 1016 documents behaviour which is new in the 2017 standard. 1017 </p><p> 1018 <span class="emphasis"><em>20.5.1.2 [headers]</em></span> 1019 Whether names from Annex K are declared by C++ headers depends on 1020 whether the underlying C library supports Annex K and declares the 1021 names. For the GNU C library, there is no Annex K support and so 1022 none of its names are declared by C++ headers. 1023 </p><p> 1024 <span class="emphasis"><em>23.6.5 [optional.bad_optional_access]</em></span> 1025 <code class="code">what()</code> returns <code class="literal">"bad optional access"</code>. 1026 </p><p> 1027 <span class="emphasis"><em>23.7.3 [variant.variant]</em></span> 1028 <code class="classname">variant</code> supports over-aligned types. 1029 </p><p> 1030 <span class="emphasis"><em>23.7.10 [variant.bad.access]</em></span> 1031 <code class="code">what()</code> returns one of the strings 1032 <code class="literal">"std::get: variant is valueless"</code>, 1033 <code class="literal">"std::get: wrong index for variant"</code>, 1034 <code class="literal">"std::visit: variant is valueless"</code>, 1035 or <code class="literal">"std::visit<R>: variant is valueless"</code>. 1036 </p><p> 1037 <span class="emphasis"><em>23.12.5.2 [memory.resource.pool.options]</em></span> 1038 Let S equal <code class="code">numeric_limits<size_t>::digits</code>. 1039 The limit for maximum number of blocks in a chunk is given by 1040 <span class="mathphrase">2<sup>N</sup>-1</span>, 1041 where N is <span class="mathphrase">min(19, 3 + S/2)</span>. 1042 The largest allocation size that will be allocated from a pool is 1043 <span class="mathphrase">2<sup>22</sup></span> 1044 when <span class="mathphrase">S > 20</span>, 1045 otherwise 3072 when <span class="mathphrase">S > 16</span>, 1046 otherwise 768. 1047 </p><p> 1048 <span class="emphasis"><em>23.12.6.1 [memory.resource.monotonic.buffer.ctor]</em></span> 1049 The default <code class="code">next_buffer_size</code> is <code class="code">128 * sizeof(void*)</code>. 1050 The default growth factor is <code class="code">1.5</code>. 1051 </p><p> 1052 <span class="emphasis"><em>23.15.4.3 [meta.unary.prop]</em></span> 1053 The predicate condition for 1054 <code class="code">has_unique_object_representations</code> is true for all scalar 1055 types except floating point types. 1056 </p><p> 1057 <span class="emphasis"><em>23.19.3 [execpol.type], 1058 28.4.3 [algorithms.parallel.exec]</em></span> 1059 There are no implementation-defined execution policies. 1060 </p><p> 1061 <span class="emphasis"><em>24.4.2 [string.view.template]</em></span> 1062 <code class="classname">basic_string_view<C, T>::iterator</code> is 1063 <code class="code">C*</code> and 1064 <code class="classname">basic_string_view<C, T>::const_iterator</code> is 1065 <code class="code">const C*</code>. 1066 </p><p> 1067 <span class="emphasis"><em>28.4.3 [algorithms.parallel.exec]</em></span> 1068 Threads of execution created by <code class="classname">std::thread</code> 1069 provide concurrent forward progress guarantees, so threads of execution 1070 implicitly created by the library will provide parallel forward 1071 progress guarantees. 1072 </p><p> 1073 <span class="emphasis"><em>29.4.1 [cfenv.syn]</em></span> 1074 The effects of the <code class="filename"><cfenv></code> functions 1075 depends on whether the <code class="code">FENV_ACCESS</code> pragma is supported, 1076 and on the C library that provides the header. 1077 </p><p> 1078 <span class="emphasis"><em>29.6.9 [c.math.rand]</em></span> 1079 Whether the <code class="function">rand</code> function may introduce data 1080 races depends on the target C library that provides the function. 1081 </p><p> 1082 <span class="emphasis"><em>29.9.5 [sf.cmath]</em></span> 1083 The effect of calling the mathematical special functions with large 1084 inputs should be documented here. 1085 </p><p> 1086 <span class="emphasis"><em>30.10.2.1 [fs.conform.9945]</em></span> 1087 The behavior of the filesystem library implementation will depend on 1088 the target operating system. Some features will not be supported 1089 on some targets. Symbolic links and file permissions 1090 are not supported on Windows. 1091 </p><p> 1092 <span class="emphasis"><em>30.10.5 [fs.filesystem.syn]</em></span> 1093 The clock used for file times is an unspecified type 1094 with a signed 64-bit representation, capable of representing 1095 timestamps with nanosecond resolution. The clock's epoch is 1096 unspecified, but is not the same as the system clock's epoch. 1097 </p><p> 1098 <span class="emphasis"><em>30.10.7.1 [fs.path.generic]</em></span> 1099 dot-dot in the root-directory refers to the root-directory itself. 1100 On Windows, a drive specifier such as <code class="code">"C:"</code> or 1101 <code class="code">"z:"</code> is treated as a root-name. On Cygwin, a path 1102 that begins with two successive directory separators is a 1103 root-name. Otherwise (for POSIX-like systems other than Cygwin), 1104 the implementation-defined root-name is an unspecified string 1105 which does not appear in any pathnames. 1106 </p><p> 1107 <span class="emphasis"><em>30.10.10.1 [fs.enum.path.format]</em></span> 1108 The character sequence is always interpreted in the native pathname 1109 format. 1110 </p><p> 1111 <span class="emphasis"><em>30.10.15.4 [fs.op.file_size]</em></span> 1112 If <code class="code">!is_regular_file(p)</code>, an error is reported. 1113 </p><p> 1114 <span class="emphasis"><em>30.10.15.32 [fs.op.rename]</em></span> 1115 On Windows, <code class="code">filesystem::rename</code> 1116 is implemented by calling <code class="code">MoveFileExW</code> and so 1117 does not meet the requirements of POSIX <code class="code">rename</code> 1118 when one or both of the paths resolves to an existing directory. 1119 Specifically, it is not possible to rename a directory to replace another 1120 directory (POSIX requires that to work if the directory being 1121 replaced is empty). 1122 </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2020"></a>C++ 2020</h3></div></div></div><p> 1123In this implementation the <code class="literal">-std=gnu++2a</code> or 1124<code class="literal">-std=c++2a</code> flag must be used to enable language 1125and library 1126features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 1127options. The pre-defined symbol 1128<code class="constant">__cplusplus</code> is used to check for the 1129presence of the required flag. 1130</p><p> 1131This section describes the C++20 and library TS support in mainline GCC, 1132not in any particular release. 1133</p><p> 1134The following table lists new library features that have been accepted into 1135the C++20 working draft. The "Proposal" column provides a link to the 1136ISO C++ committee proposal that describes the feature, while the "Status" 1137column indicates the first version of GCC that contains an implementation of 1138this feature (if it has been implemented). 1139A dash (—) in the status column indicates that the changes in the proposal 1140either do not affect the code in libstdc++, or the changes are not required for conformance. 1141The "SD-6 Feature Test / Notes" column shows the corresponding macro or header from 1142<a class="link" href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_top">SD-6: 1143Feature-testing recommendations for C++</a> (where applicable) 1144or any notes about the implementation. 1145</p><div class="table"><a id="table.cxx20_features"></a><p class="title"><strong>Table 1.8. C++ 2020 Library Features</strong></p><div class="table-contents"><table class="table" summary="C++ 2020 Library Features" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Library Feature</th><th align="left">Proposal</th><th align="left">Status</th><th align="left">SD-6 Feature Test / Notes</th></tr></thead><tbody><tr><td colspan="4" align="left"> 1146 <span class="bold"><strong>Compile-time programming</strong></span> 1147 </td></tr><tr><td align="left"> Add constexpr modifiers to functions in <code class="code"><algorithm></code> and <code class="code"><utility></code> Headers </td><td align="left"> 1148 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0202r3.html" target="_top"> 1149 P0202R3 </a> 1150 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_algorithms >= 201703L</code> </td></tr><tr><td align="left"> Constexpr for <code class="code">swap</code> and swap related functions </td><td align="left"> 1151 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0879r0.html" target="_top"> 1152 P0879R0 </a> 1153 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_algorithms >= 201806L</code> </td></tr><tr><td align="left"> Constexpr for <code class="code">std::complex</code> </td><td align="left"> 1154 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0415r1.html" target="_top"> 1155 P0415R1 </a> 1156 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_complex >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> P0595R2 <code class="code">std::is_constant_evaluated()</code> </td><td align="left"> 1157 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0595r2.html" target="_top"> 1158 P0595R2 </a> 1159 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_is_constant_evaluated >= 201811L</code> </td></tr><tr><td align="left"> More constexpr containers </td><td align="left"> 1160 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0784r7.html" target="_top"> 1161 P0784R7 </a> 1162 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_dynamic_alloc >= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Making <code class="code">std::string</code> constexpr </td><td align="left"> 1163 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0980r1.pdf" target="_top"> 1164 P0980R1 </a> 1165 </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_constexpr_string >= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Making <code class="code">std::vector</code> constexpr </td><td align="left"> 1166 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1004r2.pdf" target="_top"> 1167 P1004R2 </a> 1168 </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_constexpr_vector >= 201907L</code> </td></tr><tr><td align="left"> Constexpr in <code class="code">std::pointer_traits</code> </td><td align="left"> 1169 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1006r1.pdf" target="_top"> 1170 P1006R1 </a> 1171 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_memory >= 201811L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> constexpr for <code class="code"><numeric></code> algorithms </td><td align="left"> 1172 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1645r1.html" target="_top"> 1173 P1645R1 </a> 1174 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_numeric >= 201911L</code> </td></tr><tr><td align="left"> Constexpr iterator requirements </td><td align="left"> 1175 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0858r0.html" target="_top"> 1176 P0858R0 </a> 1177 </td><td align="center"> 9.1 </td><td align="left"> 1178 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_array_constexpr >= 201803L</code> </td></tr><tr><td> <code class="code">__cpp_lib_string_view >= 201803L</code> </td></tr><tr><td> (both since 9.4, see Note 1) </td></tr></tbody></table></div> 1179 </td></tr><tr><td align="left"> <code class="code">constexpr</code> comparison operators for <code class="code">std::array</code> </td><td align="left"> 1180 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1023r0.pdf" target="_top"> 1181 P1023R0 </a> 1182 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_array_constexpr >= 201806</code> </td></tr><tr><td align="left"> Misc constexpr bits </td><td align="left"> 1183 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1032r1.html" target="_top"> 1184 P1032R1 </a> 1185 </td><td align="center"> 10.1 </td><td align="left"> 1186 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_array_constexpr >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_functional >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_iterator >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_string_view >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_tuple >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_utility >= 201811L</code> </td></tr></tbody></table></div> 1187 </td></tr><tr><td align="left"> <code class="code">constexpr <span class="emphasis"><em>INVOKE</em></span></code> </td><td align="left"> 1188 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1065r2.html" target="_top"> 1189 P1065R2 </a> 1190 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_functional >= 201907L</code> </td></tr><tr><td align="left"> Transformation Trait <code class="code">remove_cvref</code> </td><td align="left"> 1191 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0550r2.pdf" target="_top"> 1192 P0550R2 </a> 1193 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_remove_cvref >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Implicit conversion traits and utility functions </td><td align="left"> 1194 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0758r1.html" target="_top"> 1195 P0758R1 </a> 1196 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_is_nothrow_convertible >= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> The <code class="code">identity</code> metafunction </td><td align="left"> 1197 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0887r1.pdf" target="_top"> 1198 P0887R1 </a> 1199 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_type_identity >= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> <code class="code">unwrap_ref_decay</code> and <code class="code">unwrap_reference</code> </td><td align="left"> 1200 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0318r1.pdf" target="_top"> 1201 P0318R1 </a> 1202 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_unwrap_ref >= 201811L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#B0B0B0"><td align="left"> Improving Completeness Requirements for Type Traits </td><td align="left"> 1203 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1285r0.pdf" target="_top"> 1204 P1285R0 </a> 1205 </td><td align="center"> Partial </td><td align="left"> </td></tr><tr><td align="left"> Missing feature test macros </td><td align="left"> 1206 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1353r0.html" target="_top"> 1207 P1353R0 </a> 1208 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> Making std::underlying_type SFINAE-friendly </td><td align="left"> 1209 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0340r3.html" target="_top"> 1210 P0340R3 </a> 1211 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> Traits for [Un]bounded Arrays </td><td align="left"> 1212 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1357r1.pdf" target="_top"> 1213 P1357R1 </a> 1214 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_bounded_array_traits >= 201902L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Layout-compatibility and pointer-interconvertibility traits </td><td align="left"> 1215 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0466r5.pdf" target="_top"> 1216 P0466R5 </a> 1217 </td><td align="center"> </td><td align="left"> 1218 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_is_layout_compatible >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_is_pointer_interconvertible >= 201907L</code> </td></tr></tbody></table></div> 1219 </td></tr><tr><td align="left"> Integrating feature-test macros into the C++ WD </td><td align="left"> 1220 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0941r2.html" target="_top"> 1221 P0941R2 </a> 1222 </td><td align="center"> 5.1 </td><td align="left"> </td></tr><tr><td align="left"> <code class="code"><version></code> </td><td align="left"> 1223 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0754r2.pdf" target="_top"> 1224 P0754R2 </a> 1225 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__has_include(<version>)</code> </td></tr><tr><td colspan="4" align="left"> 1226 <span class="bold"><strong>Synchronization</strong></span> 1227 </td></tr><tr><td align="left"> Atomic Ref </td><td align="left"> 1228 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0019r8.html" target="_top"> 1229 P0019R8 </a> 1230 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_ref >= 201806L</code> </td></tr><tr><td align="left"> Floating Point Atomic </td><td align="left"> 1231 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0020r6.html" target="_top"> 1232 P0020R6 </a> 1233 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_float >= 201711L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> C++ Synchronized Buffered Ostream </td><td align="left"> 1234 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0053r7.pdf" target="_top"> 1235 P0053R7 </a> 1236 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_syncbuf >= 201711L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Manipulators for C++ Synchronized Buffered Ostream </td><td align="left"> 1237 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0753r2.pdf" target="_top"> 1238 P0753R2 </a> 1239 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_syncbuf >= 201803L</code> </td></tr><tr><td align="left"> Make <code class="code">std::memory_order</code> a scoped enumeration </td><td align="left"> 1240 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0439r0.html" target="_top"> 1241 P0439R0 </a> 1242 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> The Curious Case of Padding Bits, Featuring Atomic Compare-and-Exchange </td><td align="left"> 1243 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0528r3.html" target="_top"> 1244 P0528R3 </a> 1245 </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Atomic <code class="code">shared_ptr</code> </td><td align="left"> 1246 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0718r2.html" target="_top"> 1247 P0718R2 </a> 1248 </td><td align="center"> </td><td align="left"> <code class="code"> __cpp_lib_atomic_shared_ptr >= 201711L</code> </td></tr><tr><td align="left"> std::stop_token and std::jthread </td><td align="left"> 1249 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0660r10.pdf" target="_top"> 1250 P0660R10 </a> 1251 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_jthread >= 201907L</code> </td></tr><tr><td align="left"> Rename <code class="code">condition_variable_any</code> interruptible wait methods </td><td align="left"> 1252 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1869r1.html" target="_top"> 1253 P1869R1 </a> 1254 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_jthread >= 201911L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Atomic waiting and notifying, std::semaphore, std::latch and std::barrier </td><td align="left"> 1255 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1135r6.html" target="_top"> 1256 P1135R6 </a> 1257 </td><td align="center"> </td><td align="left"> 1258 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_atomic_lock_free_type_aliases >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_atomic_flag_test >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_atomic_wait >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_semaphore >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_latch >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_barrier >= 201907L</code> </td></tr></tbody></table></div> 1259 </td></tr><tr><td align="left"> Fixing Atomic Initialization </td><td align="left"> 1260 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0883r2.pdf" target="_top"> 1261 P0883R2 </a> 1262 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_value_initialization >= 201911L</code> </td></tr><tr><td colspan="4" align="left"> 1263 <span class="bold"><strong>Ranges and Concepts</strong></span> 1264 </td></tr><tr><td align="left"> Standard Library Concepts </td><td align="left"> 1265 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0898r3.pdf" target="_top"> 1266 P0898R3 </a> 1267 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts >= 201806L</code> </td></tr><tr><td align="left"> Rename concepts to standard_case for C++20, while we still can </td><td align="left"> 1268 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1754r1.pdf" target="_top"> 1269 P1754R1 </a> 1270 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts >= 201907L</code> </td></tr><tr><td align="left"> Wording for <span class="emphasis"><em><code class="code">boolean-testable</code></em></span> </td><td align="left"> 1271 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1964r2.html" target="_top"> 1272 P1964R2 </a> 1273 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts >= 202002L</code> </td></tr><tr><td align="left"> The One Ranges Proposal </td><td align="left"> 1274 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0896r4.pdf" target="_top"> 1275 P0896R4 </a> 1276 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 201811L</code> </td></tr><tr><td align="left"> Input Range Adaptors </td><td align="left"> 1277 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1035r7.pdf" target="_top"> 1278 P1035R7 </a> 1279 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 201907L</code> </td></tr><tr><td align="left"> <code class="code">ranges</code> compare algorithm are over-constrained </td><td align="left"> 1280 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1716r3.html" target="_top"> 1281 P1716R3 </a> 1282 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 201911L</code> </td></tr><tr><td align="left"> Remove CommonReference requirement from StrictWeakOrdering (a.k.a Fixing Relations) </td><td align="left"> 1283 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1248r1.html" target="_top"> 1284 P1248R1 </a> 1285 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> Ranges Design Cleanup </td><td align="left"> 1286 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1252r2.pdf" target="_top"> 1287 P1252R2 </a> 1288 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td colspan="4" align="left"> 1289 <span class="bold"><strong>Time, dates, calendars, time zones</strong></span> 1290 </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Extending chrono to Calendars and Time Zones </td><td align="left"> 1291 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r7.html" target="_top"> 1292 P0355R7 </a> 1293 </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_chrono >= 201803L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Miscellaneous minor fixes for chrono </td><td align="left"> 1294 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1466r3.html" target="_top"> 1295 P1466R3 </a> 1296 </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_chrono >= 201907L</code> </td></tr><tr><td align="left"> <code class="code"><chrono></code> <code class="code">zero()</code>, <code class="code">min()</code>, and <code class="code">max()</code> should be <code class="code">noexcept</code> </td><td align="left"> 1297 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0972r0.pdf" target="_top"> 1298 P0972R0 </a> 1299 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td colspan="4" align="left"> 1300 <span class="bold"><strong>Three-way comparison</strong></span> 1301 </td></tr><tr><td align="left"> Library Support for the Spaceship (Comparison) Operator </td><td align="left"> 1302 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0768r1.pdf" target="_top"> 1303 P0768R1 </a> 1304 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_three_way_comparison >= 201711L</code> </td></tr><tr><td align="left"> Symmetry for spaceship </td><td align="left"> 1305 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0905r1.html" target="_top"> 1306 P0905R1 </a> 1307 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> Adding <=> to the standard library </td><td align="left"> 1308 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1614r2.html" target="_top"> 1309 P1614R2 </a> 1310 </td><td align="center"> 10.1 </td><td align="left"> 1311 <code class="code">__cpp_lib_three_way_comparison >= 201907L</code> 1312 </td></tr><tr><td colspan="4" align="left"> 1313 <span class="bold"><strong>Strings and text</strong></span> 1314 </td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code">string::reserve</code> Should Not Shrink </td><td align="left"> 1315 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0966r1.html" target="_top"> 1316 P0966R1 </a> 1317 </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> <code class="code">char8_t</code>: A type for UTF-8 characters and strings </td><td align="left"> 1318 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0482r6.html" target="_top"> 1319 P0482R6 </a> 1320 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_char8_t >= 201811L</code> </td></tr><tr><td align="left"> <code class="code">char8_t</code> backward compatibility remediation </td><td align="left"> 1321 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r3.html" target="_top"> 1322 P1423R3 </a> 1323 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_char8_t >= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Text formatting </td><td align="left"> 1324 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0645r10.html" target="_top"> 1325 P0645R10 </a> 1326 </td><td align="center"> </td><td align="left"> 1327 <code class="code">__cpp_lib_format >= 201907L</code> 1328 </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Integration of chrono with text formatting </td><td align="left"> 1329 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1361r2.pdf" target="_top"> 1330 P1361R2 </a> 1331 </td><td align="center"> </td><td align="left"> 1332 <code class="code">__cpp_lib_format >= 201907L</code> 1333 </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Printf corner cases in <code class="code">std::format</code> </td><td align="left"> 1334 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1652r1.html" target="_top"> 1335 P1652R1 </a> 1336 </td><td align="center"> </td><td align="left"> 1337 <code class="code">__cpp_lib_format >= 201907L</code> 1338 </td></tr><tr><td align="left"> String Prefix and Suffix Checking </td><td align="left"> 1339 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0457r2.html" target="_top"> 1340 P0457R2 </a> 1341 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_starts_ends_with >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Update The Reference To The Unicode Standard </td><td align="left"> 1342 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1025r1.html" target="_top"> 1343 P1025R1 </a> 1344 </td><td align="center"> </td><td align="left"> </td></tr><tr><td colspan="4" align="left"> 1345 <span class="bold"><strong>Containers</strong></span> 1346 </td></tr><tr><td align="left"> span: bounds-safe views for sequences of objects </td><td align="left"> 1347 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0122r7.pdf" target="_top"> 1348 P0122R7 </a> 1349 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span >= 201803L</code> </td></tr><tr><td align="left"> 1350 Usability Enhancements for <code class="classname">std::span</code> 1351 </td><td align="left"> 1352 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1024r3.pdf" target="_top"> 1353 P1024R3 </a> 1354 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span >= 201902L</code> </td></tr><tr><td align="left"> Should Span be Regular? </td><td align="left"> 1355 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1085r2.md" target="_top"> 1356 P1085R2 </a> 1357 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> Fixed-size <code class="code"><span></code> construction from dynamic range </td><td align="left"> 1358 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1976r2.html" target="_top"> 1359 P1976R2 </a> 1360 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span >= 202002L</code> </td></tr><tr><td align="left"> <code class="code">std::to_array</code> </td><td align="left"> 1361 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0325r4.html" target="_top"> 1362 P0325R4 </a> 1363 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_to_array >= 201907L</code> </td></tr><tr><td align="left"> Checking for Existence of an Element in Associative Containers </td><td align="left"> 1364 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0458r2.html" target="_top"> 1365 P0458R2 </a> 1366 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Comparing Unordered Containers </td><td align="left"> 1367 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0809r0.pdf" target="_top"> 1368 P0809R0 </a> 1369 </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Heterogeneous lookup for unordered containers </td><td align="left"> 1370 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0919r3.html" target="_top"> 1371 P0919R3 </a> 1372 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_generic_unordered_lookup >= 201811</code> </td></tr><tr><td align="left"> Adopt Consistent Container Erasure from Library Fundamentals 2 for C++20 </td><td align="left"> 1373 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1209r0.html" target="_top"> 1374 P1209R0 </a> 1375 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_erase_if >= 201811L</code> </td></tr><tr><td align="left"> Improving the Return Value of Erase-Like Algorithms </td><td align="left"> 1376 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0646r1.pdf" target="_top"> 1377 P0646R1 </a> 1378 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_list_remove_return_type >= 201806L</code> </td></tr><tr><td align="left"> Improving the Return Value of Erase-Like Algorithms II: Free <code class="code">erase</code>/<code class="code">erase_if</code> </td><td align="left"> 1379 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1115r3.pdf" target="_top"> 1380 P1115R3 </a> 1381 </td><td align="center"> 9.1 </td><td align="left"> 1382 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_erase_if >= 202002L</code> </td></tr><tr><td> (defined to <code class="code">201900L</code> for GCC 9.1 and 9.2 so use <code class="code">> 201811L</code>) </td></tr></tbody></table></div> 1383 </td></tr><tr><td align="left"> Signed ssize() functions, unsigned size() functions </td><td align="left"> 1384 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1227r2.html" target="_top"> 1385 P1227R2 </a> 1386 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ssize >= 201902L</code> </td></tr><tr><td colspan="4" align="left"> 1387 <span class="bold"><strong>Memory management</strong></span> 1388 </td></tr><tr><td align="left"> Utility to convert a pointer to a raw pointer </td><td align="left"> 1389 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0653r2.html" target="_top"> 1390 P0653R2 </a> 1391 </td><td align="center"> 8.1 </td><td align="left"> <code class="code">__cpp_lib_to_address >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Extending <code class="code">make_shared</code> to Support Arrays </td><td align="left"> 1392 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0674r1.html" target="_top"> 1393 P0674R1 </a> 1394 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_shared_ptr_arrays >= 201707L</code> </td></tr><tr><td align="left"> Efficient sized delete for variable sized classes </td><td align="left"> 1395 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0722r3.html" target="_top"> 1396 P0722R3 </a> 1397 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_destroying_delete >= 201806L</code> </td></tr><tr><td align="left"> Utility functions to implement uses-allocator construction </td><td align="left"> 1398 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0591r4.pdf" target="_top"> 1399 P0591R4 </a> 1400 </td><td align="center"> 9.1 </td><td align="left"> 1401 <code class="code">std::scoped_allocator_adaptor</code> changes missing in 9.1.0 1402 </td></tr><tr><td align="left"> <code class="code">std::assume_aligned</code> </td><td align="left"> 1403 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1007r3.pdf" target="_top"> 1404 P1007R3 </a> 1405 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_assume_aligned >= 201811L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Smart pointer creation with default initialization </td><td align="left"> 1406 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1020r1.html" target="_top"> 1407 P1020R1 </a> 1408 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_smart_ptr_for_overwrite >= 201811L</code> </td></tr><tr><td align="left"> Make stateful allocator propagation more consistent for <code class="code">operator+(basic_string)</code> </td><td align="left"> 1409 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1165r1.html" target="_top"> 1410 P1165R1 </a> 1411 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> 1412 <code class="classname">polymorphic_allocator<></code> as a vocabulary type 1413 </td><td align="left"> 1414 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0339r6.pdf" target="_top"> 1415 P0339R6 </a> 1416 </td><td align="center"> 9.1 </td><td align="left"> 1417 <code class="code">__cpp_lib_polymorphic_allocator >= 201902L</code> (since 9.4, see Note 1) 1418 </td></tr><tr><td align="left"> LWG 2511: guaranteed copy elision for piecewise construction </td><td align="left"> 1419 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0475r1.html" target="_top"> 1420 P0475R1 </a> 1421 </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td colspan="4" align="left"> 1422 <span class="bold"><strong>Miscellaneous</strong></span> 1423 </td></tr><tr><td align="left"> <code class="code">nodiscard</code> in the Library </td><td align="left"> 1424 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0600r1.pdf" target="_top"> 1425 P0600R1 </a> 1426 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> de-pessimize legacy algorithms with <code class="code">std::move</code> </td><td align="left"> 1427 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0616r0.pdf" target="_top"> 1428 P0616R0 </a> 1429 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> Deprecate POD </td><td align="left"> 1430 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0767r1.html" target="_top"> 1431 P0767R1 </a> 1432 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> Treating Unnecessary <code class="code">decay</code> </td><td align="left"> 1433 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0777r1.pdf" target="_top"> 1434 P0777R1 </a> 1435 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Thou Shalt Not Specialize std Function Templates! </td><td align="left"> 1436 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0551r3.pdf" target="_top"> 1437 P0551R3 </a> 1438 </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Bit-casting object representations </td><td align="left"> 1439 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0476r2.html" target="_top"> 1440 P0476R2 </a> 1441 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_bit_cast >= 201806L</code> </td></tr><tr><td align="left"> Integral power-of-2 operations </td><td align="left"> 1442 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0556r3.html" target="_top"> 1443 P0556R3 </a> 1444 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_int_pow2 >= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> On the names of low-level bit manipulation functions </td><td align="left"> 1445 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1956r1.pdf" target="_top"> 1446 P1956R1 </a> 1447 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_int_pow2 >= 202002L</code> </td></tr><tr><td align="left"> Safe integral comparisons </td><td align="left"> 1448 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p0586r2.html" target="_top"> 1449 P0586R2 </a> 1450 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_integer_comparison_functions >= 202002L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Reviewing Deprecated Facilities of C++17 for C++20 </td><td align="left"> 1451 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0619r4.html" target="_top"> 1452 P0619R4 </a> 1453 </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> <code class="code">fpos</code> Requirements </td><td align="left"> 1454 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0759r1.html" target="_top"> 1455 P0759R1 </a> 1456 </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left"> Add <code class="code">shift</code> to <code class="code"><algorithm></code> </td><td align="left"> 1457 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0769r2.pdf" target="_top"> 1458 P0769R2 </a> 1459 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_shift >= 201806L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Standard Library Specification in a Concepts and Contracts World </td><td align="left"> 1460 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0788r3.pdf" target="_top"> 1461 P0788R3 </a> 1462 </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> <code class="code">explicit(bool)</code> </td><td align="left"> 1463 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0892r2.html" target="_top"> 1464 P0892R2 </a> 1465 </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left"> Eradicating unnecessarily explicit default constructors from the standard library </td><td align="left"> 1466 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0935r0.html" target="_top"> 1467 P0935R0 </a> 1468 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> <code class="code">std::function</code> move constructor should be <code class="code">noexcept</code> </td><td align="left"> 1469 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0771r1.pdf" target="_top"> 1470 P0771R1 </a> 1471 </td><td align="center"> 7.2 </td><td align="left"> </td></tr><tr><td align="left"> Simplified partial function application </td><td align="left"> 1472 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0356r5.html" target="_top"> 1473 P0356R5 </a> 1474 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_bind_front >= 201811L</code> </td></tr><tr><td align="left"> <code class="code">bind_front</code> should not unwrap <code class="code">reference_wrapper</code> </td><td align="left"> 1475 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1651r0.html" target="_top"> 1476 P1651R0 </a> 1477 </td><td align="center"> 9.3 </td><td align="left"> <code class="code">__cpp_lib_bind_front >= 201907L</code> </td></tr><tr><td align="left"> <code class="code">reference_wrapper</code> for incomplete types </td><td align="left"> 1478 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0357r3.html" target="_top"> 1479 P0357R3 </a> 1480 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Fixing <code class="code">operator>>(basic_istream&, CharT*)</code> (LWG 2499) </td><td align="left"> 1481 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0487r1.html" target="_top"> 1482 P0487R1 </a> 1483 </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> <code class="code">variant</code> and <code class="code">optional</code> should propagate copy/move triviality </td><td align="left"> 1484 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0602r4.html" target="_top"> 1485 P0602R4 </a> 1486 </td><td align="center"> 8.3 </td><td align="left"> </td></tr><tr><td align="left"> A sane <code class="code">variant</code> converting constructor </td><td align="left"> 1487 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0608r3.html" target="_top"> 1488 P0608R3 </a> 1489 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> <code class="code">visit<R></code>: Explicit Return Type for <code class="code">visit</code> </td><td align="left"> 1490 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0655r1.pdf" target="_top"> 1491 P0655R1 </a> 1492 </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> P0899R1 - LWG 3016 is not a defect </td><td align="left"> 1493 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0899r1.html" target="_top"> 1494 P0899R1 </a> 1495 </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left"> Editorial Guidance for merging P0019r8 and P0528r3 </td><td align="left"> 1496 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1123r0.html" target="_top"> 1497 P1123R0 </a> 1498 </td><td align="center"> — </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Cleaning up Clause 20 </td><td align="left"> 1499 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1148r0.pdf" target="_top"> 1500 P1148R0 </a> 1501 </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Completing the Rebase of Library Fundamentals, Version 3, Working Draft </td><td align="left"> 1502 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1210r0.html" target="_top"> 1503 P1210R0 </a> 1504 </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> Alternative Wording for P0907R4 Signed Integers are Two's Complement </td><td align="left"> 1505 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1236r1.html" target="_top"> 1506 P1236R1 </a> 1507 </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left"> 1508 I Stream, You Stream, We All Stream for 1509 <code class="classname">istream_iterator</code> 1510 </td><td align="left"> 1511 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0738r2.html" target="_top"> 1512 P0738R2 </a> 1513 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> 1514 Mandating the Standard Library: 1515 Clause 16 - Language support library 1516 </td><td align="left"> 1517 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1458r1.pdf" target="_top"> 1518 P1458R1 </a> 1519 </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left"> 1520 Mandating the Standard Library: 1521 Clause 18 - Diagnostics library 1522 </td><td align="left"> 1523 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1458r1.pdf" target="_top"> 1524 P1459R1 </a> 1525 </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left"> 1526 Mandating the Standard Library: 1527 Clause 20 - Strings library 1528 </td><td align="left"> 1529 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1462r1.html" target="_top"> 1530 P1462R1 </a> 1531 </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left"> 1532 Mandating the Standard Library: 1533 Clause 21 - Containers library 1534 </td><td align="left"> 1535 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1463r1.pdf" target="_top"> 1536 P1463R1 </a> 1537 </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 1538 Mandating the Standard Library: 1539 Clause 22 - Iterators library 1540 </td><td align="left"> 1541 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1464r1.pdf" target="_top"> 1542 P1464R1 </a> 1543 </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> Make <code class="code">create_directory()</code> Intuitive </td><td align="left"> 1544 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1164r1.pdf" target="_top"> 1545 P1164R1 1546 </a> 1547 </td><td align="center"> 8.3 </td><td align="left"> Treated as a DR for C++17 </td></tr><tr><td align="left"> 1548 Target Vectorization Policies from Parallelism V2 TS to C++20 1549 </td><td align="left"> 1550 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1001r2.html" target="_top"> 1551 P1001R2 </a> 1552 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_execution >= 201902L</code> (since 9.4, see Note 1)</td></tr><tr><td align="left"> Merge Coroutines TS into C++20 working draft </td><td align="left"> 1553 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0912r5.html" target="_top"> 1554 P0912R5 </a> 1555 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_coroutines >= 201902L</code> </td></tr><tr><td align="left"> Endian just Endian </td><td align="left"> 1556 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0463r1.html" target="_top"> 1557 P0463R1 </a> 1558 </td><td align="center"> 8.1 </td><td align="left"> <code class="code">__cpp_lib_endian >= 201907L</code> </td></tr><tr><td align="left"> Bit operations </td><td align="left"> 1559 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0553r4.html" target="_top"> 1560 P0553R4 </a> 1561 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_bitops >= 201907L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Well-behaved interpolation for numbers and pointers </td><td align="left"> 1562 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0811r3.html" target="_top"> 1563 P0811R3 </a> 1564 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_interpolate >= 201902L</code> </td></tr><tr><td align="left"> Mathematical constants </td><td align="left"> 1565 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0631r8.pdf" target="_top"> 1566 P0631R8 </a> 1567 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_math_constants >= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> std::source_location </td><td align="left"> 1568 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1208r6.pdf" target="_top"> 1569 P1208R6 </a> 1570 </td><td align="center"> </td><td align="left"> 1571 <code class="code">__cpp_lib_source_location >= 201907L</code> 1572 </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Efficient access to std::basic_stringbuf's Buffer </td><td align="left"> 1573 <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0408r7.pdf" target="_top"> 1574 P0408R7 </a> 1575 </td><td align="center"> </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><p> 1576Note 1: This feature is supported in older releases but the 1577<code class="code">__cpp_lib</code> macro is not defined to the right value 1578(or not defined at all) until the version shown in parentheses. 1579</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr1"></a>C++ TR1</h3></div></div></div><p> 1580This table is based on the table of contents of ISO/IEC DTR 19768 1581Doc No: N1836=05-0096 Date: 2005-06-24 1582Draft Technical Report on C++ Library Extensions 1583</p><p> 1584In this implementation the header names are prefixed by 1585<code class="code">tr1/</code>, for instance <code class="code"><tr1/functional></code>, 1586<code class="code"><tr1/memory></code>, and so on. 1587</p><p> 1588This page describes the TR1 support in mainline GCC, not in any particular 1589release. 1590</p><div class="table"><a id="table.tr1_status"></a><p class="title"><strong>Table 1.9. C++ TR1 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ TR1 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"><span class="emphasis"><em>2</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>General Utilities</em></span></td></tr><tr><td align="left">2.1</td><td align="left">Reference wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.1.1</td><td align="left">Additions to header <code class="code"><functional></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.1.2.1</td><td align="left"><code class="code">reference_wrapper</code> construct/copy/destroy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.2</td><td align="left"><code class="code">reference_wrapper</code> assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.3</td><td align="left"><code class="code">reference_wrapper</code> access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.4</td><td align="left"><code class="code">reference_wrapper</code> invocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.5</td><td align="left"><code class="code">reference_wrapper</code> helper functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.2.1</td><td align="left">Additions to header <code class="code"><memory></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.2</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left"> </td><td align="left"> 1591 <p> 1592 Uses code from 1593 <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>. 1594 </p> 1595 </td></tr><tr><td align="left">2.2.3.1</td><td align="left"><code class="code">shared_ptr</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.2</td><td align="left"><code class="code">shared_ptr</code> destructor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.3</td><td align="left"><code class="code">shared_ptr</code> assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.4</td><td align="left"><code class="code">shared_ptr</code> modifiers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.5</td><td align="left"><code class="code">shared_ptr</code> observers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.6</td><td align="left"><code class="code">shared_ptr</code> comparison</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.7</td><td align="left"><code class="code">shared_ptr</code> I/O</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.8</td><td align="left"><code class="code">shared_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.9</td><td align="left"><code class="code">shared_ptr</code> casts</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.10</td><td align="left"><code class="code">get_deleter</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.2.4.1</td><td align="left"><code class="code">weak_ptr</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.2</td><td align="left"><code class="code">weak_ptr</code> destructor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.3</td><td align="left"><code class="code">weak_ptr</code> assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.4</td><td align="left"><code class="code">weak_ptr</code> modifiers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.5</td><td align="left"><code class="code">weak_ptr</code> observers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.6</td><td align="left"><code class="code">weak_ptr</code> comparison</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.7</td><td align="left"><code class="code">weak_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.5</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>3</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Function Objects</em></span></td></tr><tr><td align="left">3.1</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2</td><td align="left">Additions to <code class="code"><functional> synopsis</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4</td><td align="left">Function return types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.5</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6</td><td align="left">Function object binders</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.6.1</td><td align="left">Class template <code class="code">is_bind_expression</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6.2</td><td align="left">Class template <code class="code">is_placeholder</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6.3</td><td align="left">Function template <code class="code">bind</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6.4</td><td align="left">Placeholders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7</td><td align="left">Polymorphic function wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.7.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.1.1</td><td align="left"><code class="code">bad_function_call</code> constructor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2</td><td align="left">Class template <code class="code">function</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.7.2.1</td><td align="left"><code class="code">function</code> construct/copy/destroy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.2</td><td align="left"><code class="code">function</code> modifiers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.3</td><td align="left"><code class="code">function</code> capacity</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.4</td><td align="left"><code class="code">function</code> invocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.5</td><td align="left"><code class="code">function</code> target access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.6</td><td align="left">undefined operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.7</td><td align="left">null pointer comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.8</td><td align="left">specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>4</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Metaprogramming and type traits</em></span></td></tr><tr><td align="left">4.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.4</td><td align="left">General Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.5</td><td align="left">Unary Type Traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">4.5.1</td><td align="left">Primary Type Categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.5.2</td><td align="left">Composite type traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.5.3</td><td align="left">Type properties</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7</td><td align="left">Transformations between types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">4.7.1</td><td align="left">Const-volatile modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7.2</td><td align="left">Reference modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7.3</td><td align="left">Array modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7.4</td><td align="left">Pointer modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.8</td><td align="left">Other transformations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.9</td><td align="left">Implementation requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>5</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Numerical Facilities</em></span></td></tr><tr><td align="left">5.1</td><td align="left">Random number generation</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">5.1.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.2</td><td align="left">Header <code class="code"><random></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.3</td><td align="left">Class template <code class="code">variate_generator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4</td><td align="left">Random number engine class templates</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.1</td><td align="left">Class template <code class="code">linear_congruential</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.2</td><td align="left">Class template <code class="code">mersenne_twister</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.3</td><td align="left">Class template <code class="code">subtract_with_carry</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.4</td><td align="left">Class template <code class="code">subtract_with_carry_01</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.5</td><td align="left">Class template <code class="code">discard_block</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.6</td><td align="left">Class template <code class="code">xor_combine</code></td><td align="left">Y</td><td align="left">operator()() per N2079</td></tr><tr><td align="left">5.1.5</td><td align="left">Engines with predefined parameters</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.6</td><td align="left">Class <code class="code">random_device</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7</td><td align="left">Random distribution class templates</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.1</td><td align="left">Class template <code class="code">uniform_int</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.2</td><td align="left">Class <code class="code">bernoulli_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.3</td><td align="left">Class template <code class="code">geometric_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.4</td><td align="left">Class template <code class="code">poisson_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.5</td><td align="left">Class template <code class="code">binomial_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.6</td><td align="left">Class template <code class="code">uniform_real</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.7</td><td align="left">Class template <code class="code">exponential_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.8</td><td align="left">Class template <code class="code">normal_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.9</td><td align="left">Class template <code class="code">gamma_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1</td><td align="left">Additions to header <code class="code"><cmath></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.1</td><td align="left">associated Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.2</td><td align="left">associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.3</td><td align="left">beta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.4</td><td align="left">(complete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.5</td><td align="left">(complete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.6</td><td align="left">(complete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.7</td><td align="left">confluent hypergeometric functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.8</td><td align="left">regular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.9</td><td align="left">cylindrical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.10</td><td align="left">irregular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.11</td><td align="left">cylindrical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.12</td><td align="left">(incomplete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.13</td><td align="left">(incomplete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.14</td><td align="left">(incomplete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.15</td><td align="left">exponential integral</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.16</td><td align="left">Hermite polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.17</td><td align="left">hypergeometric functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.18</td><td align="left">Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.19</td><td align="left">Legendre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.20</td><td align="left">Riemann zeta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.21</td><td align="left">spherical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.22</td><td align="left">spherical associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.23</td><td align="left">spherical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.2</td><td align="left">Additions to header <code class="code"><math.h></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>6</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Containers</em></span></td></tr><tr><td align="left">6.1</td><td align="left">Tuple types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.1</td><td align="left">Header <code class="code"><tuple></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.2</td><td align="left">Additions to header <code class="code"><utility></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3</td><td align="left">Class template <code class="code">tuple</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.1</td><td align="left">Construction</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.2</td><td align="left">Tuple creation functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.3</td><td align="left">Tuple helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.4</td><td align="left">Element access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.5</td><td align="left">Relational operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.4</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2</td><td align="left">Fixed size array</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.1</td><td align="left">Header <code class="code"><array></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2</td><td align="left">Class template <code class="code">array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.1</td><td align="left"><code class="code">array</code> constructors, copy, and assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.2</td><td align="left"><code class="code">array</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.3</td><td align="left"><code class="code">array</code> size</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.4</td><td align="left">Zero sized <code class="code">array</code>s</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.5</td><td align="left">Tuple interface to class template <code class="code">array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.1</td><td align="left">Unordered associative container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.1.1</td><td align="left">Exception safety guarantees</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.2</td><td align="left">Additions to header <code class="code"><functional></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.3</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4</td><td align="left">Unordered associative container classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.1</td><td align="left">Header <code class="code"><unordered_set></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.2</td><td align="left">Header <code class="code"><unordered_map></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.3</td><td align="left">Class template <code class="code">unordered_set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.3.1</td><td align="left"><code class="code">unordered_set</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.3.2</td><td align="left"><code class="code">unordered_set</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4</td><td align="left">Class template <code class="code">unordered_map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4.1</td><td align="left"><code class="code">unordered_map</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4.2</td><td align="left"><code class="code">unordered_map</code> element access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4.3</td><td align="left"><code class="code">unordered_map</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.5</td><td align="left">Class template <code class="code">unordered_multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.5.1</td><td align="left"><code class="code">unordered_multiset</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.5.2</td><td align="left"><code class="code">unordered_multiset</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.6</td><td align="left">Class template <code class="code">unordered_multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.6.1</td><td align="left"><code class="code">unordered_multimap</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.6.2</td><td align="left"><code class="code">unordered_multimap</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>7</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Regular Expressions</em></span></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.1</td><td align="left">Definitions</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.2</td><td align="left">Requirements</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.3</td><td align="left">Regular expressions summary</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5</td><td align="left">Namespace <code class="code">tr1::regex_constants</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.1</td><td align="left">Bitmask Type <code class="code">syntax_option_type</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.2</td><td align="left">Bitmask Type <code class="code">regex_constants::match_flag_type</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.3</td><td align="left">Implementation defined <code class="code">error_type</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.1</td><td align="left"><code class="code">basic_regex</code> constants</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.2</td><td align="left"><code class="code">basic_regex</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.3</td><td align="left"><code class="code">basic_regex</code> assign</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.4</td><td align="left"><code class="code">basic_regex</code> constant operations</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.5</td><td align="left"><code class="code">basic_regex</code> locale</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.6</td><td align="left"><code class="code">basic_regex</code> swap</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.7</td><td align="left"><code class="code">basic_regex</code> non-member functions</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.7.1</td><td align="left"><code class="code">basic_regex</code> non-member swap</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9.1</td><td align="left"><code class="code">sub_match</code> members</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9.2</td><td align="left"><code class="code">sub_match</code> non-member operators</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.1</td><td align="left"><code class="code">match_results</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.2</td><td align="left"><code class="code">match_results</code> size</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.3</td><td align="left"><code class="code">match_results</code> element access</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.4</td><td align="left"><code class="code">match_results</code> formatting</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.5</td><td align="left"><code class="code">match_results</code> allocator</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.6</td><td align="left"><code class="code">match_results</code> swap</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11</td><td align="left">Regular expression algorithms</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.1</td><td align="left">exceptions</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.2</td><td align="left"><code class="code">regex_match</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.3</td><td align="left"><code class="code">regex_search</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.4</td><td align="left"><code class="code">regex_replace</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12</td><td align="left">Regular expression Iterators</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1</td><td align="left">Class template <code class="code">regex_iterator</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.1</td><td align="left"><code class="code">regex_iterator</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.2</td><td align="left"><code class="code">regex_iterator</code> comparisons</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.3</td><td align="left"><code class="code">regex_iterator</code> dereference</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.4</td><td align="left"><code class="code">regex_iterator</code> increment</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2</td><td align="left">Class template <code class="code">regex_token_iterator</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.1</td><td align="left"><code class="code">regex_token_iterator</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.2</td><td align="left"><code class="code">regex_token_iterator</code> comparisons</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.3</td><td align="left"><code class="code">regex_token_iterator</code> dereference</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.4</td><td align="left"><code class="code">regex_token_iterator</code> increment</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>8</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>C Compatibility</em></span></td></tr><tr><td align="left">8.1</td><td align="left">Additions to header <code class="code"><complex></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.2</td><td align="left">Function <code class="code">acos</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.3</td><td align="left">Function <code class="code">asin</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.4</td><td align="left">Function <code class="code">atan</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.5</td><td align="left">Function <code class="code">acosh</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.6</td><td align="left">Function <code class="code">asinh</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.7</td><td align="left">Function <code class="code">atanh</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.8</td><td align="left">Function <code class="code">fabs</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.9</td><td align="left">Additional Overloads</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.2</td><td align="left">Header <code class="code"><ccomplex></code></td><td align="left">N</td><td align="left">DR 551</td></tr><tr bgcolor="#C8B0B0"><td align="left">8.3</td><td align="left">Header <code class="code"><complex.h></code></td><td align="left">N</td><td align="left">DR 551</td></tr><tr><td align="left">8.4</td><td align="left">Additions to header <code class="code"><cctype></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.4.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.4.2</td><td align="left">Function <code class="code">isblank</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.5</td><td align="left">Additions to header <code class="code"><ctype.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.6</td><td align="left">Header <code class="code"><cfenv></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.6.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.6.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.7</td><td align="left">Header <code class="code"><fenv.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.8</td><td align="left">Additions to header <code class="code"><cfloat></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.9</td><td align="left">Additions to header <code class="code"><float.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10</td><td align="left">Additions to header <code class="code"><ios></code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10.1</td><td align="left">Synopsis</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10.2</td><td align="left">Function <code class="code">hexfloat</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">8.11</td><td align="left">Header <code class="code"><cinttypes></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.11.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left">DR 557</td></tr><tr><td align="left">8.11.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.12</td><td align="left">Header <code class="code"><inttypes.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.13</td><td align="left">Additions to header <code class="code"><climits></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.14</td><td align="left">Additions to header <code class="code"><limits.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.15</td><td align="left">Additions to header <code class="code"><locale></code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">8.16</td><td align="left">Additions to header <code class="code"><cmath></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.3</td><td align="left">Function template definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.4</td><td align="left">Additional overloads</td><td align="left">Y</td><td align="left">DR 568; DR 550</td></tr><tr><td align="left">8.17</td><td align="left">Additions to header <code class="code"><math.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.18</td><td align="left">Additions to header <code class="code"><cstdarg></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.19</td><td align="left">Additions to header <code class="code"><stdarg.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.20</td><td align="left">The header <code class="code"><cstdbool></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.21</td><td align="left">The header <code class="code"><stdbool.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.22</td><td align="left">The header <code class="code"><cstdint></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.22.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.22.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.23</td><td align="left">The header <code class="code"><stdint.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24</td><td align="left">Additions to header <code class="code"><cstdio></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24.3</td><td align="left">Additional format specifiers</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.24.4</td><td align="left">Additions to header <code class="code"><stdio.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25</td><td align="left">Additions to header <code class="code"><cstdlib></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.3</td><td align="left">Function <code class="code">abs</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.4</td><td align="left">Function <code class="code">div</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.26</td><td align="left">Additions to header <code class="code"><stdlib.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.27</td><td align="left">Header <code class="code"><ctgmath></code></td><td align="left">Y</td><td align="left">DR 551</td></tr><tr><td align="left">8.28</td><td align="left">Header <code class="code"><tgmath.h></code></td><td align="left">Y</td><td align="left">DR 551</td></tr><tr><td align="left">8.29</td><td align="left">Additions to header <code class="code"><ctime></code></td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.30</td><td align="left">Additions to header <code class="code"><cwchar></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.30.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.30.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.30.3</td><td align="left">Additional wide format specifiers</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.31</td><td align="left">Additions to header <code class="code"><wchar.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.32</td><td align="left">Additions to header <code class="code"><cwctype></code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.32.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.32.2</td><td align="left">Function <code class="code">iswblank</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.33</td><td align="left">Additions to header <code class="code"><wctype.h></code></td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.tr1.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is specified by the 1998 and 2003 standards, 1596 see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation 1597 Specific Behavior</a>. This section documents behaviour which 1598 is required by TR1. 1599 </p><p> 1600 <span class="emphasis"><em>3.6.4 [tr.func.bind.place]/1</em></span> There are 29 1601 placeholders defined and the placeholder types are 1602 <code class="literal">Assignable</code>. 1603 </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr24733"></a>C++ TR 24733</h3></div></div></div><p> 1604This table is based on the table of contents of 1605ISO/IEC TR 24733 Date: 2009-08-28 1606Extension for the programming language C++ to support 1607decimal floating-point arithmetic 1608</p><p> 1609This page describes the TR 24733 support in mainline GCC, not in any 1610particular release. 1611</p><div class="table"><a id="table.decfp_status"></a><p class="title"><strong>Table 1.10. C++ TR 24733 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ TR 24733 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 1612 <span class="emphasis"><em>0</em></span> 1613 </td><td colspan="3" align="left"> 1614 <span class="emphasis"><em>Introduction</em></span> 1615 </td></tr><tr><td align="left"> 1616 <span class="emphasis"><em>1</em></span> 1617 </td><td colspan="3" align="left"> 1618 <span class="emphasis"><em>Normative references</em></span> 1619 </td></tr><tr><td align="left"> 1620 <span class="emphasis"><em>2</em></span> 1621 </td><td colspan="3" align="left"> 1622 <span class="emphasis"><em>Conventions</em></span> 1623 </td></tr><tr><td align="left"> 1624 <span class="emphasis"><em>3</em></span> 1625 </td><td colspan="3" align="left"> 1626 <span class="emphasis"><em>Decimal floating-point types</em></span> 1627 </td></tr><tr><td align="left">3.1</td><td align="left">Characteristics of decimal floating-point types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.2</td><td align="left">Decimal Types</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.1</td><td align="left">Class <code class="code">decimal</code> synopsis</td><td align="left">Partial</td><td align="left">Missing declarations for formatted input/output; non-conforming extension for functions converting to integral type</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.2</td><td align="left">Class <code class="code">decimal32</code></td><td align="left">Partial</td><td align="left">Missing 3.2.2.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.3</td><td align="left">Class <code class="code">decimal64</code></td><td align="left">Partial</td><td align="left">Missing 3.2.3.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.4</td><td align="left">Class <code class="code">decimal128</code></td><td align="left">Partial</td><td align="left">Missing 3.2.4.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr><td align="left">3.2.5</td><td align="left">Initialization from coefficient and exponent</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.6</td><td align="left">Conversion to generic floating-point type</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.7</td><td align="left">Unary arithmetic operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.8</td><td align="left">Binary arithmetic operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.9</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.2.10</td><td align="left">Formatted input</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.2.11</td><td align="left">Formatted output</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.3</td><td align="left">Additions to header <code class="code">limits</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">3.4</td><td align="left">Headers <code class="code">cfloat</code> and <code class="code">float.h</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.4.2</td><td align="left">Additions to header <code class="code">cfloat</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">3.4.3</td><td align="left">Additions to header <code class="code">float.h</code> synopsis</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">3.4.4</td><td align="left">Maximum finite value</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.5</td><td align="left">Epsilon</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.6</td><td align="left">Minimum positive normal value</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.7</td><td align="left">Minimum positive subnormal value</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.8</td><td align="left">Evaluation format</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.5</td><td align="left">Additions to <code class="code">cfenv</code> and <code class="code">fenv.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.6</td><td align="left">Additions to <code class="code">cmath</code> and <code class="code">math.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.7</td><td align="left">Additions to <code class="code">cstdio</code> and <code class="code">stdio.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.8</td><td align="left">Additions to <code class="code">cstdlib</code> and <code class="code">stdlib.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.9</td><td align="left">Additions to <code class="code">cwchar</code> and <code class="code">wchar.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.10</td><td align="left">Facets</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.11</td><td align="left">Type traits</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.12</td><td align="left">Hash functions</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left"> 1628 <span class="emphasis"><em>4</em></span> 1629 </td><td colspan="3" align="left"> 1630 <span class="emphasis"><em>Notes on C compatibility</em></span> 1631 </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.specfun"></a>C++ IS 29124</h3></div></div></div><p> 1632This table is based on the table of contents of ISO/IEC FDIS 29124 1633Doc No: N3060 Date: 2010-03-06 1634Extensions to the C++ Library to support mathematical special functions 1635</p><p> 1636Complete support for IS 29124 is in GCC 6.1 and later releases, when using 1637at least C++11 (for older releases or C++98/C++03 use TR1 instead). 1638For C++11 and C++14 the additions to the library are not declared by their 1639respective headers unless <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code> 1640is defined as a macro that expands to a non-zero integer constant. 1641For C++17 the special functions are always declared (since GCC 7.1). 1642</p><p> 1643When the special functions are declared the macro 1644<code class="code">__STDCPP_MATH_SPEC_FUNCS__</code> is defined to <code class="code">201003L</code>. 1645</p><p> 1646In addition to the special functions defined in IS 29124, for 1647non-strict modes (i.e. <code class="code">-std=gnu++NN</code> modes) the 1648hypergeometric functions and confluent hypergeometric functions 1649from TR1 are also provided, defined in namespace 1650<code class="code">__gnu_cxx</code>. 1651</p><div class="table"><a id="table.specfun_status"></a><p class="title"><strong>Table 1.11. C++ Special Functions Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Special Functions Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr bgcolor="#B0B0B0"><td align="left">7</td><td align="left">Macro names</td><td align="left">Partial</td><td align="left">No diagnostic for inconsistent definitions of 1652 <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code></td></tr><tr><td align="left">8</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1</td><td align="left">Additions to header <code class="code"><cmath></code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.1</td><td align="left">associated Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.2</td><td align="left">associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.3</td><td align="left">beta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.4</td><td align="left">(complete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.5</td><td align="left">(complete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.6</td><td align="left">(complete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.7</td><td align="left">regular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.8</td><td align="left">cylindrical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.9</td><td align="left">irregular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.10</td><td align="left">cylindrical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.11</td><td align="left">(incomplete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.12</td><td align="left">(incomplete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.13</td><td align="left">(incomplete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.14</td><td align="left">exponential integral</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.15</td><td align="left">Hermite polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.16</td><td align="left">Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.17</td><td align="left">Legendre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.18</td><td align="left">Riemann zeta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.19</td><td align="left">spherical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.20</td><td align="left">spherical associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.21</td><td align="left">spherical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.2</td><td align="left">Additions to header <code class="code"><math.h></code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">8.3</td><td align="left">The header <code class="code"><ctgmath></code></td><td align="left">Partial</td><td align="left">Conflicts with C++ 2011 requirements.</td></tr><tr bgcolor="#C8B0B0"><td align="left">8.4</td><td align="left">The header <code class="code"><tgmath.h></code></td><td align="left">N</td><td align="left">Conflicts with C++ 2011 requirements.</td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.specfun.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is specified by the 2011 standard, 1653 see <a class="link" href="status.html#iso.2011.specific" title="Implementation Specific Behavior">C++ 2011 Implementation 1654 Specific Behavior</a>. This section documents behaviour which 1655 is required by IS 29124. 1656 </p><p> 1657 <span class="emphasis"><em>7.2 [macro.user]/3 /4</em></span> The functions declared in 1658 Clause 8 are only declared when 1659 <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__ == 1</code> 1660 (or in C++17 mode, for GCC 7.1 and later). 1661 </p><p> 1662 <span class="emphasis"><em>8.1.1 [sf.cmath.Lnm]/1</em></span> The effect of calling 1663 these functions with <code class="code">n >= 128</code> or <code class="code">m >= 128</code> 1664 should be described here. 1665 </p><p> 1666 <span class="emphasis"><em>8.1.2 [sf.cmath.Plm]/3</em></span> The effect of calling 1667 these functions with <code class="code">l >= 128</code> should be described here. 1668 </p><p> 1669 <span class="emphasis"><em>8.1.3 [sf.cmath.I]/3</em></span> The effect of calling 1670 these functions with <code class="code">nu >= 128</code> should be described here. 1671 </p><p> 1672 <span class="emphasis"><em>8.1.8 [sf.cmath.J]/3</em></span> The effect of calling 1673 these functions with <code class="code">nu >= 128</code> should be described here. 1674 </p><p> 1675 <span class="emphasis"><em>8.1.9 [sf.cmath.K]/3</em></span> The effect of calling 1676 these functions with <code class="code">nu >= 128</code> should be described here. 1677 </p><p> 1678 <span class="emphasis"><em>8.1.10 [sf.cmath.N]/3</em></span> The effect of calling 1679 these functions with <code class="code">nu >= 128</code> should be described here. 1680 </p><p> 1681 <span class="emphasis"><em>8.1.15 [sf.cmath.Hn]/3</em></span> The effect of calling 1682 these functions with <code class="code">n >= 128</code> should be described here. 1683 </p><p> 1684 <span class="emphasis"><em>8.1.16 [sf.cmath.Ln]/3</em></span> The effect of calling 1685 these functions with <code class="code">n >= 128</code> should be described here. 1686 </p><p> 1687 <span class="emphasis"><em>8.1.17 [sf.cmath.Pl]/3</em></span> The effect of calling 1688 these functions with <code class="code">l >= 128</code> should be described here. 1689 </p><p> 1690 <span class="emphasis"><em>8.1.19 [sf.cmath.j]/3</em></span> The effect of calling 1691 these functions with <code class="code">n >= 128</code> should be described here. 1692 </p><p> 1693 <span class="emphasis"><em>8.1.20 [sf.cmath.Ylm]/3</em></span> The effect of calling 1694 these functions with <code class="code">l >= 128</code> should be described here. 1695 </p><p> 1696 <span class="emphasis"><em>8.1.21 [sf.cmath.n]/3</em></span> The effect of calling 1697 these functions with <code class="code">n >= 128</code> should be described here. 1698 </p></div></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="intro.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="intro.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="license.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Part I. 1699 Introduction 1700 1701 </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> License</td></tr></table></div></body></html>