176d0caaeSpatrick.. _cxx20-status: 276d0caaeSpatrick 376d0caaeSpatrick================================ 476d0caaeSpatricklibc++ C++20 Status 576d0caaeSpatrick================================ 676d0caaeSpatrick 776d0caaeSpatrick.. include:: ../Helpers/Styles.rst 876d0caaeSpatrick 976d0caaeSpatrick.. contents:: 1076d0caaeSpatrick :local: 1176d0caaeSpatrick 1276d0caaeSpatrick 1376d0caaeSpatrickOverview 1476d0caaeSpatrick================================ 1576d0caaeSpatrick 1676d0caaeSpatrickIn July 2017, the C++ standard committee created a draft for the next version of the C++ standard, initially known as "C++2a". 1776d0caaeSpatrickIn September 2020, the C++ standard committee approved this draft, and sent it to ISO for approval as C++20. 1876d0caaeSpatrick 1976d0caaeSpatrickThis page shows the status of libc++; the status of clang's support of the language features is `here <https://clang.llvm.org/cxx_status.html#cxx20>`__. 2076d0caaeSpatrick 2176d0caaeSpatrick.. attention:: Features in unreleased drafts of the standard are subject to change. 2276d0caaeSpatrick 2376d0caaeSpatrickThe groups that have contributed papers: 2476d0caaeSpatrick 2576d0caaeSpatrick- CWG - Core Language Working group 2676d0caaeSpatrick- LWG - Library working group 2776d0caaeSpatrick- SG1 - Study group #1 (Concurrency working group) 2876d0caaeSpatrick 2976d0caaeSpatrick.. note:: "Nothing to do" means that no library changes were needed to implement this change. 3076d0caaeSpatrick 3176d0caaeSpatrick.. _paper-status-cxx20: 3276d0caaeSpatrick 3376d0caaeSpatrickPaper Status 3476d0caaeSpatrick==================================== 3576d0caaeSpatrick 3676d0caaeSpatrick.. csv-table:: 3776d0caaeSpatrick :file: Cxx20Papers.csv 3876d0caaeSpatrick :header-rows: 1 3976d0caaeSpatrick :widths: auto 4076d0caaeSpatrick 4176d0caaeSpatrick.. note:: 4276d0caaeSpatrick 43*4bdff4beSrobert .. [#note-P0591] P0591: The changes in [mem.poly.allocator.mem] are missing. 44*4bdff4beSrobert .. [#note-P0645] P0645: The paper is implemented but still marked as an incomplete feature 45*4bdff4beSrobert (the feature-test macro is not set and the libary is only available when built with ``-fexperimental-library``). 46*4bdff4beSrobert Not yet implemented LWG-issues will cause API and ABI breakage. 4776d0caaeSpatrick .. [#note-P0966] P0966: It was previously erroneously marked as complete in version 8.0. See `bug 45368 <https://llvm.org/PR45368>`__. 4876d0caaeSpatrick .. [#note-P0619] P0619: Only sections D.8, D.9, D.10 and D.13 are implemented. Sections D.4, D.7, D.11, D.12, and D.14 remain undone. 49*4bdff4beSrobert .. [#note-P0883.1] P0883: shared_ptr and floating-point changes weren't applied as they themselves aren't implemented yet. 50*4bdff4beSrobert .. [#note-P0883.2] P0883: ``ATOMIC_FLAG_INIT`` was marked deprecated in version 14.0, but was undeprecated with the implementation of LWG3659 in version 15.0. 51*4bdff4beSrobert .. [#note-P2231] P2231: Optional is complete. The changes to variant haven't been implemented yet. 5276d0caaeSpatrick 5376d0caaeSpatrick.. _issues-status-cxx20: 5476d0caaeSpatrick 5576d0caaeSpatrickLibrary Working Group Issues Status 5676d0caaeSpatrick==================================== 5776d0caaeSpatrick 5876d0caaeSpatrick.. csv-table:: 5976d0caaeSpatrick :file: Cxx20Issues.csv 6076d0caaeSpatrick :header-rows: 1 6176d0caaeSpatrick :widths: auto 62