================================ libc++ C++23 Status

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Overview

In November 2020, the C++ standard committee adopted the first changes to the next version of the C++ standard, known here as "C++2b" (probably to be C++23). In February 2023, the C++ standard committee approved this draft, and sent it to ISO for approval as C++23.

This page shows the status of libc++; the status of clang's support of the language features is here.

.. attention:: Features in unreleased drafts of the standard are subject to change.

The groups that have contributed papers:

CWG - Core Language Working group
LWG - Library working group
SG1 - Study group #1 (Concurrency working group)

.. note:: "Nothing to do" means that no library changes were needed to implement this change.

.. _paper-status-cxx23:

Paper Status

.. csv-table:: :file: Cxx23Papers.csv :header-rows: 1 :widths: auto

.. note::

.. [#note-P0533R9] P0533R9: isfinite, isinf, isnan and isnormal are implemented. .. [#note-P1413R3] P1413R3: std::aligned_storage_t and std::aligned_union_t are marked deprecated, but clang doesn't issue a diagnostic for deprecated using template declarations. .. [#note-P2520R0] P2520R0: Libc++ implemented this paper as a DR in C++20 as well. .. [#note-P2602R2] P2602R2: Libc++ implemented this paper as a DR in C++20 as well. .. [#note-P2711R1] P2711R1: join_with_view hasn't been done yet since this type isn't implemented yet. .. [#note-P2770R0] P2770R0: join_with_view hasn't been done yet since this type isn't implemented yet. .. [#note-P2693R1] P2693R1: The formatter for std::thread::id is implemented. The formatter for stacktrace is not implemented, since stacktrace is not implemented yet.

.. _issues-status-cxx23:

Library Working Group Issues Status

.. csv-table:: :file: Cxx23Issues.csv :header-rows: 1 :widths: auto

.. note::

.. [#note-LWG3750] LWG3750 Only __cpp_lib_format_ranges is fully implemented. .. [#note-LWG3798] LWG3798: join_with_view, zip_transform_view, and adjacent_transform_view haven't been done yet since these types aren't implemented yet. .. [#note-LWG3036] LWG3036: This issue was reverted by P2875R4