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>API Evolution and Deprecation History</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, api, evolution, deprecation, history" /><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="appendix_porting.html" title="Appendix B. Porting and Maintenance" /><link rel="prev" href="abi.html" title="ABI Policy and Guidelines" /><link rel="next" href="backwards.html" title="Backwards Compatibility" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">API Evolution and Deprecation History</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="abi.html">Prev</a> </td><th width="60%" align="center">Appendix B. 3 Porting and Maintenance 4 5</th><td width="20%" align="right"> <a accesskey="n" href="backwards.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="appendix.porting.api"></a>API Evolution and Deprecation History</h2></div></div></div><p> 6A list of user-visible changes, in chronological order 7</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_300"></a><code class="constant">3.0</code></h3></div></div></div><p> 8Extensions moved to <code class="filename">include/ext</code>. 9 </p><p> 10Include files from the SGI/HP sources that pre-date the ISO standard 11are added. These files are placed into 12the <code class="filename">include/backward</code> directory and a deprecated warning 13is added that notifies on inclusion (<code class="literal">-Wno-deprecated</code> 14deactivates the warning.) 15</p><p>Deprecated include <code class="filename">backward/strstream</code> added.</p><p>Removal of include <code class="filename">builtinbuf.h</code>, <code class="filename">indstream.h</code>, <code class="filename">parsestream.h</code>, <code class="filename">PlotFile.h</code>, <code class="filename">SFile.h</code>, <code class="filename">stdiostream.h</code>, and <code class="filename">stream.h</code>. 16</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_310"></a><code class="constant">3.1</code></h3></div></div></div><p> 17 </p><p> 18Extensions from SGI/HP moved from <code class="code">namespace std</code> 19to <code class="code">namespace __gnu_cxx</code>. As part of this, the following 20new includes are 21added: <code class="filename">ext/algorithm</code>, <code class="filename">ext/functional</code>, <code class="filename">ext/iterator</code>, <code class="filename">ext/memory</code>, and <code class="filename">ext/numeric</code>. 22</p><p> 23Extensions to <code class="code">basic_filebuf</code> introduced: <code class="code">__gnu_cxx::enc_filebuf</code>, and <code class="code">__gnu_cxx::stdio_filebuf</code>. 24</p><p> 25Extensions to tree data structures added in <code class="filename">ext/rb_tree</code>. 26</p><p> 27Removal of <code class="filename">ext/tree</code>, moved to <code class="filename">backward/tree.h</code>. 28</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_320"></a><code class="constant">3.2</code></h3></div></div></div><p> 29 </p><p>Symbol versioning introduced for shared library.</p><p>Removal of include <code class="filename">backward/strstream.h</code>.</p><p>Allocator changes. Change <code class="code">__malloc_alloc</code> to <code class="code">malloc_allocator</code> and <code class="code">__new_alloc</code> to <code class="code">new_allocator</code>. </p><p> For GCC releases from 2.95 through the 3.1 series, defining 30 <code class="literal">__USE_MALLOC</code> on the gcc command line would change the 31 default allocation strategy to instead use <code class="code"> malloc</code> and 32 <code class="function">free</code>. For the 3.2 and 3.3 release series the same 33 functionality was spelled <code class="literal">_GLIBCXX_FORCE_NEW</code>. From 34 GCC 3.4 onwards the functionality is enabled by setting 35 <code class="literal">GLIBCXX_FORCE_NEW</code> in the environment, see 36 <a class="link" href="mt_allocator.html" title="Chapter 20. The mt_allocator">the mt allocator chapter</a> 37 for details. 38 </p><p>Error handling in iostreams cleaned up, made consistent. </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_330"></a><code class="constant">3.3</code></h3></div></div></div><p> 39 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_340"></a><code class="constant">3.4</code></h3></div></div></div><p> 40 </p><p> 41Large file support. 42</p><p> Extensions for generic characters and <code class="code">char_traits</code> added in <code class="filename">ext/pod_char_traits.h</code>. 43</p><p> 44Support for <code class="code">wchar_t</code> specializations of <code class="code">basic_filebuf</code> enhanced to support <code class="code">UTF-8</code> and <code class="code">Unicode</code>, depending on host. More hosts support basic <code class="code">wchar_t</code> functionality. 45</p><p> 46Support for <code class="code">char_traits</code> beyond builtin types. 47</p><p> 48Conformant <code class="code">allocator</code> class and usage in containers. As 49part of this, the following extensions are 50added: <code class="filename">ext/bitmap_allocator.h</code>, <code class="filename">ext/debug_allocator.h</code>, <code class="filename">ext/mt_allocator.h</code>, <code class="filename">ext/malloc_allocator.h</code>,<code class="filename">ext/new_allocator.h</code>, <code class="filename">ext/pool_allocator.h</code>. 51</p><p> 52This is a change from all previous versions, and may require 53source-level changes due to allocator-related changes to structures 54names and template parameters, filenames, and file locations. Some, 55like <code class="code">__simple_alloc, __allocator, __alloc, </code> and <code class="code"> 56_Alloc_traits</code> have been removed. 57</p><p>Default behavior of <code class="code">std::allocator</code> has changed.</p><p> 58 Previous versions prior to 3.4 cache allocations in a memory 59 pool, instead of passing through to call the global allocation 60 operators (i.e., <code class="classname">__gnu_cxx::pool_allocator</code>). More 61 recent versions default to the 62 simpler <code class="classname">__gnu_cxx::new_allocator</code>. 63</p><p> Previously, all allocators were written to the SGI 64 style, and all STL containers expected this interface. This 65 interface had a traits class called <code class="code">_Alloc_traits</code> that 66 attempted to provide more information for compile-time allocation 67 selection and optimization. This traits class had another allocator 68 wrapper, <code class="code">__simple_alloc<T,A></code>, which was a 69 wrapper around another allocator, A, which itself is an allocator 70 for instances of T. But wait, there's more: 71 <code class="code">__allocator<T,A></code> is another adapter. Many of 72 the provided allocator classes were SGI style: such classes can be 73 changed to a conforming interface with this wrapper: 74 <code class="code">__allocator<T, __alloc></code> is thus the same as 75 <code class="code">allocator<T></code>. 76 </p><p> The class <code class="classname">allocator</code> used the typedef 77 <span class="type">__alloc</span> to select an underlying allocator that 78 satisfied memory allocation requests. The selection of this 79 underlying allocator was not user-configurable. 80 </p><div class="table"><a id="table.extension_allocators"></a><p class="title"><strong>Table B.6. Extension Allocators</strong></p><div class="table-contents"><table class="table" summary="Extension Allocators" 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">Allocator (3.4)</th><th align="left">Header (3.4)</th><th align="left">Allocator (3.[0-3])</th><th align="left">Header (3.[0-3])</th></tr></thead><tbody><tr><td align="left"><code class="classname">__gnu_cxx::new_allocator<T></code></td><td align="left"><code class="filename">ext/new_allocator.h</code></td><td align="left"><code class="classname">std::__new_alloc</code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::malloc_allocator<T></code></td><td align="left"><code class="filename">ext/malloc_allocator.h</code></td><td align="left"><code class="classname">std::__malloc_alloc_template<int></code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::debug_allocator<T></code></td><td align="left"><code class="filename">ext/debug_allocator.h</code></td><td align="left"><code class="classname">std::debug_alloc<T></code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::__pool_alloc<T></code></td><td align="left"><code class="filename">ext/pool_allocator.h</code></td><td align="left"><code class="classname">std::__default_alloc_template<bool,int></code></td><td align="left"><code class="filename">memory</code></td></tr><tr><td align="left"><code class="classname">__gnu_cxx::__mt_alloc<T></code></td><td align="left"><code class="filename">ext/mt_allocator.h</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left"><code class="classname">__gnu_cxx::bitmap_allocator<T></code></td><td align="left"><code class="filename">ext/bitmap_allocator.h</code></td><td align="left"> </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><p> Releases after gcc-3.4 have continued to add to the collection 81 of available allocators. All of these new allocators are 82 standard-style. The following table includes details, along with 83 the first released version of GCC that included the extension allocator. 84 </p><div class="table"><a id="table.extension_allocators2"></a><p class="title"><strong>Table B.7. Extension Allocators Continued</strong></p><div class="table-contents"><table class="table" summary="Extension Allocators Continued" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /></colgroup><thead><tr><th align="left">Allocator</th><th align="left">Include</th><th align="left">Version</th></tr></thead><tbody><tr><td align="left"><code class="classname">__gnu_cxx::array_allocator<T></code></td><td align="left"><code class="filename">ext/array_allocator.h</code></td><td align="left">4.0.0</td></tr><tr><td align="left"><code class="classname">__gnu_cxx::throw_allocator<T></code></td><td align="left"><code class="filename">ext/throw_allocator.h</code></td><td align="left">4.2.0</td></tr></tbody></table></div></div><br class="table-break" /><p> 85Debug mode first appears. 86</p><p> 87Precompiled header support <acronym class="acronym">PCH</acronym> support. 88</p><p> 89Macro guard for changed, from <code class="literal">_GLIBCPP_</code> to <code class="literal">_GLIBCXX_</code>. 90</p><p> 91Extension <code class="filename">ext/stdio_sync_filebuf.h</code> added. 92</p><p> 93Extension <code class="filename">ext/demangle.h</code> added. 94</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_400"></a><code class="constant">4.0</code></h3></div></div></div><p> 95 </p><p> 96TR1 features first appear. 97</p><p> 98Extension allocator <code class="filename">ext/array_allocator.h</code> added. 99</p><p> 100Extension <code class="code">codecvt</code> specializations moved to <code class="filename">ext/codecvt_specializations.h</code>. 101</p><p> 102Removal of <code class="filename">ext/demangle.h</code>. 103</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_410"></a><code class="constant">4.1</code></h3></div></div></div><p> 104 </p><p> 105Removal of <code class="filename">cassert</code> from all standard headers: now has to be explicitly included for <code class="code">std::assert</code> calls. 106</p><p> Extensions for policy-based data structures first added. New includes, 107types, namespace <code class="code">pb_assoc</code>. 108</p><p> Extensions for typelists added in <code class="filename">ext/typelist.h</code>. 109</p><p> Extension for policy-based <code class="code">basic_string</code> first added: <code class="code">__gnu_cxx::__versa_string</code> in <code class="filename">ext/vstring.h</code>. 110</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_420"></a><code class="constant">4.2</code></h3></div></div></div><p> 111 </p><p> Default visibility attributes applied to <code class="code">namespace std</code>. Support for <code class="code">-fvisibility</code>. 112</p><p>TR1 <code class="filename">random</code>, <code class="filename">complex</code>, and C compatibility headers added.</p><p> Extensions for concurrent programming consolidated 113into <code class="filename">ext/concurrence.h</code> and <code class="filename">ext/atomicity.h</code>, 114including change of namespace to <code class="code">__gnu_cxx</code> in some 115cases. Added types 116include <code class="code">_Lock_policy</code>, <code class="code">__concurrence_lock_error</code>, <code class="code">__concurrence_unlock_error</code>, <code class="code">__mutex</code>, <code class="code">__scoped_lock</code>.</p><p> Extensions for type traits consolidated 117into <code class="filename">ext/type_traits.h</code>. Additional traits are added 118(<code class="code">__conditional_type</code>, <code class="code">__enable_if</code>, others.) 119</p><p> Extensions for policy-based data structures revised. New includes, 120types, namespace moved to <code class="code">__pb_ds</code>. 121</p><p> Extensions for debug mode modified: now nested in <code class="code">namespace 122std::__debug</code> and extensions in <code class="code">namespace 123__gnu_cxx::__debug</code>.</p><p> Extensions added: <code class="filename">ext/typelist.h</code> 124and <code class="filename">ext/throw_allocator.h</code>. 125</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_430"></a><code class="constant">4.3</code></h3></div></div></div><p> 126 </p><p> 127C++0X features first appear. 128</p><p>TR1 <code class="filename">regex</code> and <code class="filename">cmath</code>'s mathematical special function added. 129</p><p> 130Backward include edit. 131</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Removed</p><p> 132<code class="filename">algobase.h</code> <code class="filename">algo.h</code> <code class="filename">alloc.h</code> <code class="filename">bvector.h</code> <code class="filename">complex.h</code> 133<code class="filename">defalloc.h</code> <code class="filename">deque.h</code> <code class="filename">fstream.h</code> <code class="filename">function.h</code> <code class="filename">hash_map.h</code> <code class="filename">hash_set.h</code> 134<code class="filename">hashtable.h</code> <code class="filename">heap.h</code> <code class="filename">iomanip.h</code> <code class="filename">iostream.h</code> <code class="filename">istream.h</code> <code class="filename">iterator.h</code> 135<code class="filename">list.h</code> <code class="filename">map.h</code> <code class="filename">multimap.h</code> <code class="filename">multiset.h</code> <code class="filename">new.h</code> <code class="filename">ostream.h</code> <code class="filename">pair.h</code> <code class="filename">queue.h</code> <code class="filename">rope.h</code> <code class="filename">set.h</code> <code class="filename">slist.h</code> <code class="filename">stack.h</code> <code class="filename">streambuf.h</code> <code class="filename">stream.h</code> <code class="filename">tempbuf.h</code> 136<code class="filename">tree.h</code> <code class="filename">vector.h</code> 137 </p></li><li class="listitem"><p>Added</p><p> 138 <code class="filename">hash_map</code> and <code class="filename">hash_set</code> 139 </p></li><li class="listitem"><p>Added in C++11</p><p> 140 <code class="filename">auto_ptr.h</code> and <code class="filename">binders.h</code> 141 </p></li></ul></div><p> 142Header dependency streamlining. 143</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><code class="filename">algorithm</code> no longer includes <code class="filename">climits</code>, <code class="filename">cstring</code>, or <code class="filename">iosfwd</code> </p></li><li class="listitem"><p><code class="filename">bitset</code> no longer includes <code class="filename">istream</code> or <code class="filename">ostream</code>, adds <code class="filename">iosfwd</code> </p></li><li class="listitem"><p><code class="filename">functional</code> no longer includes <code class="filename">cstddef</code></p></li><li class="listitem"><p><code class="filename">iomanip</code> no longer includes <code class="filename">istream</code>, <code class="filename">istream</code>, or <code class="filename">functional</code>, adds <code class="filename">ioswd</code> </p></li><li class="listitem"><p><code class="filename">numeric</code> no longer includes <code class="filename">iterator</code></p></li><li class="listitem"><p><code class="filename">string</code> no longer includes <code class="filename">algorithm</code> or <code class="filename">memory</code></p></li><li class="listitem"><p><code class="filename">valarray</code> no longer includes <code class="filename">numeric</code> or <code class="filename">cstdlib</code></p></li><li class="listitem"><p><code class="filename">tr1/hashtable</code> no longer includes <code class="filename">memory</code> or <code class="filename">functional</code></p></li><li class="listitem"><p><code class="filename">tr1/memory</code> no longer includes <code class="filename">algorithm</code></p></li><li class="listitem"><p><code class="filename">tr1/random</code> no longer includes <code class="filename">algorithm</code> or <code class="filename">fstream</code></p></li></ul></div><p> 144Debug mode for <code class="filename">unordered_map</code> and <code class="filename">unordered_set</code>. 145</p><p> 146Parallel mode first appears. 147</p><p>Variadic template implementations of items in <code class="filename">tuple</code> and 148 <code class="filename">functional</code>. 149</p><p>Default <code class="code">what</code> implementations give more elaborate 150 exception strings for <code class="code">bad_cast</code>, 151 <code class="code">bad_typeid</code>, <code class="code">bad_exception</code>, and 152 <code class="code">bad_alloc</code>. 153</p><p> 154PCH binary files no longer installed. Instead, the source files are installed. 155</p><p> 156Namespace pb_ds moved to __gnu_pb_ds. 157</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_440"></a><code class="constant">4.4</code></h3></div></div></div><p> 158 </p><p> 159C++0X features. 160</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> 161 Added. 162 </p><p> 163 <code class="filename">atomic</code>, 164 <code class="filename">chrono</code>, 165 <code class="filename">condition_variable</code>, 166 <code class="filename">forward_list</code>, 167 <code class="filename">initializer_list</code>, 168 <code class="filename">mutex</code>, 169 <code class="filename">ratio</code>, 170 <code class="filename">thread</code> 171 </p></li><li class="listitem"><p> 172 Updated and improved. 173 </p><p> 174 <code class="filename">algorithm</code>, 175 <code class="filename">system_error</code>, 176 <code class="filename">type_traits</code> 177 </p></li><li class="listitem"><p> 178 Use of the GNU extension namespace association converted to inline namespaces. 179 </p></li><li class="listitem"><p> 180 Preliminary support for <code class="classname">initializer_list</code> 181 and defaulted and deleted constructors in container classes. 182 </p></li><li class="listitem"><p> 183 <code class="classname">unique_ptr</code>. 184 </p></li><li class="listitem"><p> 185 Support for new character types <span class="type">char16_t</span> 186 and <span class="type">char32_t</span> added 187 to <code class="classname">char_traits</code>, <code class="classname">basic_string</code>, <code class="classname">numeric_limits</code>, 188 and assorted compile-time type traits. 189 </p></li><li class="listitem"><p> 190 Support for string conversions <code class="function">to_string</code> 191 and <code class="function">to_wstring</code>. 192 </p></li><li class="listitem"><p> 193 Member functions taking string arguments were added to iostreams 194 including <code class="classname">basic_filebuf</code>, <code class="classname">basic_ofstream</code>, 195 and <code class="classname">basic_ifstream</code>. 196 </p></li><li class="listitem"><p> 197 Exception propagation support, 198 including <code class="classname">exception_ptr</code>, <code class="function">current_exception</code>, <code class="function">copy_exception</code>, 199 and <code class="function">rethrow_exception</code>. 200 </p></li></ul></div><p> 201Uglification of <code class="literal">try</code> to <code class="literal">__try</code> 202and <code class="literal">catch</code> to <code class="literal">__catch</code>. 203 </p><p> 204Audit of internal mutex usage, conversion to functions returning static 205local mutex. 206 </p><p> Extensions 207added: <code class="filename">ext/pointer.h</code> 208and <code class="filename">ext/extptr_allocator.h</code>. Support 209for non-standard pointer types has been added 210to <code class="classname">vector</code> 211and <code class="classname">forward_list</code>. 212</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_450"></a><code class="constant">4.5</code></h3></div></div></div><p> 213 </p><p> 214C++0X features. 215</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> 216 Added. 217 </p><p> 218 <code class="filename">functional</code>, 219 <code class="filename">future</code>, 220 <code class="filename">random</code> 221 </p></li><li class="listitem"><p> 222 Updated and improved. 223 </p><p> 224 <code class="filename">atomic</code>, 225 <code class="filename">system_error</code>, 226 <code class="filename">type_traits</code> 227 </p></li><li class="listitem"><p> 228 Add support for explicit operators and standard layout types. 229 </p></li></ul></div><p> 230Profile mode first appears. 231</p><p> 232Support for decimal floating-point arithmetic, including <code class="classname">decimal32</code>, <code class="classname">decimal64</code>, and <code class="classname">decimal128</code>. 233</p><p> 234Python pretty-printers are added for use with appropriately-advanced versions of <span class="command"><strong>gdb</strong></span>. 235</p><p> 236Audit for application of function attributes nothrow, const, pure, and noreturn. 237</p><p> 238The default behavior for comparing typeinfo names changed, so 239in <code class="filename">typeinfo</code>, <code class="literal">__GXX_MERGED_TYPEINFO_NAMES</code> 240now defaults to zero. 241</p><p> Extensions modified: <code class="filename">ext/throw_allocator.h</code>. 242</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_460"></a><code class="constant">4.6</code></h3></div></div></div><p> 243 Use constexpr and nullptr where appropriate throughout the library. 244</p><p> 245 The library was updated to avoid including 246 <code class="filename">stddef.h</code> in order 247 to reduce namespace pollution. 248</p><p>Reference-count annotations to assist data race detectors. 249</p><p> 250 Added <code class="function">make_exception_ptr</code> as an alias of 251 <code class="function">copy_exception</code>. 252</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_470"></a><code class="constant">4.7</code></h3></div></div></div><p>Use of noexcept throughout library.</p><p>Partial support for C++11 allocators first appears.</p><p> 253 <code class="classname">monotonic_clock</code> renamed to 254 <code class="classname">steady_clock</code> as required by the final C++11 255 standard. 256</p><p>A new clocale model for newlib is available.</p><p> 257 The library was updated to avoid including 258 <code class="filename">unistd.h</code> in order 259 to reduce namespace pollution. 260</p><p>Debug Mode was improved for unordered containers. </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_480"></a><code class="constant">4.8</code></h3></div></div></div><p> 261 New random number engines and distributions. 262 Optimisations for random. 263</p><p>New --enable-libstdcxx-verbose configure option</p><p> 264 The --enable-libstdcxx-time configure option becomes unnecessary given a 265 sufficiently recent glibc. 266</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_490"></a><code class="constant">4.9</code></h3></div></div></div><p> Implementation of <code class="classname">regex</code> completed. </p><p> C++14 library and TS implementations are added. </p><p> <code class="function">copy_exception</code> deprecated. </p><p> <code class="classname">__gnu_cxx::array_allocator</code> deprecated. </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_51"></a><code class="constant">5</code></h3></div></div></div><p> 267 ABI transition adds new implementations of several components, using the 268 <code class="code">abi_tag</code> attribute and the <code class="code">__cxx11</code> inline 269 namespace to distinguish the new entities from the old ones. 270</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> 271 Use of the new or old ABI can be selected per-translation unit with the 272 <a class="xref" href="using_macros.html" title="Macros">Macros</a>. 273 </p></li><li class="listitem"><p> 274 New non-reference-counted <code class="classname">string</code> implementation. 275 </p></li><li class="listitem"><p> 276 New <code class="classname">list</code> implementation containing a new 277 data member in order to provide O(1) <code class="function">size()</code>. 278 </p></li><li class="listitem"><p> 279 New <code class="classname">ios_base::failure</code> implementation inheriting 280 from <code class="classname">system_error</code>. 281 </p></li></ul></div><p> 282 C++11 support completed (movable iostreams, new I/O manipulators, 283 Unicode conversion utilities, atomic operations for 284 <code class="classname">shared_ptr</code>, functions for notifying condition 285 variables and making futures ready at thread exit). 286</p><p> 287 Changed formatting of floating point types when 288 <code class="code">ios_base::fixed|ios_base::scientific</code> is set in a stream's 289 format flags. 290</p><p> Improved C++14 support and TS implementations. </p><p> New random number engines and distributions. </p><p> 291 GDB Xmethods for containers and <code class="classname">unique_ptr</code> added. 292</p><p> 293 <code class="classname">has_trivial_default_constructor</code>, 294 <code class="classname">has_trivial_copy_constructor</code> and 295 <code class="classname">has_trivial_copy_assign</code> deprecated. 296</p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="api.rel_53"></a><code class="constant">5.3</code></h4></div></div></div><p> Experimental implementation of the C++ Filesystem TS added. </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_61"></a><code class="constant">6</code></h3></div></div></div><p> C++14 support completed. </p><p> 297 Support for mathematical special functions (ISO/IEC 29124:2010) added. 298</p><p> 299 Assertions to check function preconditions can be enabled by defining the 300 <a class="xref" href="using_macros.html" title="Macros">Macros</a>. 301 The initial set of assertions are a subset of the checks enabled by 302 the Debug Mode, but without the ABI changes and changes to algorithmic 303 complexity that are caused by enabling the full Debug Mode. 304</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_71"></a><code class="constant">7</code></h3></div></div></div><p> 305 The type of exception thrown by iostreams changed to the <code class="code">cxx11</code> 306 ABI version of <code class="classname">std::ios_base::failure</code>. 307</p><p> 308 Experimental C++17 support added, including most new library features. 309 The meaning of <code class="classname">shared_ptr<T[]></code> changed to 310 match the C++17 semantics. 311</p><p> 312 <a class="xref" href="using_macros.html" title="Macros">Macros</a> added. 313</p><p> 314 <code class="classname">has_trivial_default_constructor</code>, 315 <code class="classname">has_trivial_copy_constructor</code> and 316 <code class="classname">has_trivial_copy_assign</code> removed. 317</p><p> Profile Mode was deprecated. </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="api.rel_73"></a><code class="constant">7.3</code></h4></div></div></div><p> 318 Including new C++14 or C++17 headers without a suitable <code class="option">-std</code> 319 no longer causes compilation to fail via <code class="literal">#error</code>. 320 Instead the header is simply empty and doesn't define anything. 321</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_81"></a><code class="constant">8</code></h3></div></div></div><p> 322 The exceptions thrown by iostreams can now be caught by handlers for either 323 version of <code class="classname">std::ios_base::failure</code>. 324</p><p> 325 Experimental implementation of the C++17 Filesystem library added. 326</p><p> 327 AddressSanitizer annotations added to <code class="classname">std::vector</code> 328 to detect out-of-range accesses to the unused capacity of a vector. 329</p><p> 330 <code class="function">std::char_traits<char16_t>::to_int_type(u'\uFFFF')</code> 331 now returns <code class="literal">0xFFFD</code>, as <code class="literal">0xFFFF</code> is 332 used for <code class="function">std::char_traits<char16_t>::eof()</code>. 333</p><p> 334 The extension allowing arithmetic on 335 <code class="classname">std::atomic<void*></code> and types like 336 <code class="classname">std::atomic<R(*)()></code> was deprecated. 337</p><p> 338 The <code class="function">std::uncaught_exception</code> function was deprecated 339 for C++17 mode. 340</p><p> 341 The nested typedefs <span class="type">std::hash::result_type</span> and 342 <span class="type">std::hash::argument_type</span> were deprecated for C++17 mode. 343</p><p> 344 The deprecated iostream members <span class="type">ios_base::io_state</span>, 345 <span class="type">ios_base::open_mode</span>, <span class="type">ios_base::seek_dir</span>, and 346 <code class="function">basic_streambuf::stossc</code> were removed for C++17 mode. 347</p><p> 348 The non-standard C++0x <code class="function">std::copy_exception</code> function 349 was removed. 350</p><p> 351 For <code class="option">-std=c++11</code>, <code class="option">-std=c++14</code>, and 352 <code class="option">-std=c++17</code> modes the <code class="filename"><complex.h></code> 353 header no longer includes the C99 <code class="filename"><complex.h></code> 354 header. 355</p><p> 356 For the non-default <code class="option">--enable-symvers=gnu-versioned-namespace</code> 357 configuration, the shared library SONAME has been changed to 358 <code class="filename">libstdc++.so.8</code>. 359</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="abi.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendix_porting.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="backwards.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ABI Policy and Guidelines </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Backwards Compatibility</td></tr></table></div></body></html>