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===========================
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Libc++ 24.0.0 Release Notes
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===========================
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.. contents::
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:local:
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:depth: 2
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Written by the `Libc++ Team <https://libcxx.llvm.org>`_
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.. warning::
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These are in-progress notes for the upcoming libc++ 24.0.0 release.
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Release notes for previous releases can be found on
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`the Download Page <https://releases.llvm.org/download.html>`_.
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Introduction
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============
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This document contains the release notes for the libc++ C++ Standard Library,
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part of the LLVM Compiler Infrastructure, release 24.0.0. Here we describe the
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status of libc++ in some detail, including major improvements from the previous
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release and new feature work. For the general LLVM release notes, see `the LLVM
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documentation <https://llvm.org/docs/ReleaseNotes.html>`_. All LLVM releases may
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be downloaded from the `LLVM releases web site <https://llvm.org/releases/>`_.
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For more information about libc++, please see the `Libc++ Web Site
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<https://libcxx.llvm.org>`_ or the `LLVM Web Site <https://llvm.org>`_.
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Note that if you are reading this file from a Git checkout or the
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main Libc++ web page, this document applies to the *next* release, not
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the current one. To see the release notes for a specific release, please
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see the `releases page <https://llvm.org/releases/>`_.
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What's New in Libc++ 24.0.0?
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==============================
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Implemented Papers
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------------------
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- P0493R5: Atomic minimum/maximum (`Github <https://llvm.org/PR105418>`__)
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- P0792R14: ``function_ref`` : a type-erased callable reference (`Github <https://llvm.org/PR105376>`__)
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- P3948R1: ``constant_wrapper`` is the only tool needed for passing constant expressions via function arguments (`Github <https://llvm.org/PR189604>`__)
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- P3961R1: Less double indirection in ``function_ref`` (RU-220) (`Github <https://llvm.org/PR189606>`__)
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- P1901R2: Enabling the Use of ``weak_ptr`` as Keys in Unordered Associative Containers (`Github <https://llvm.org/PR105372>`__)
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Improvements and New Features
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-----------------------------
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Deprecations and Removals
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-------------------------
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- The ``std::launch::any`` enumerator that was accidentally provided as an extension is now deprecated.
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It will be removed in LLVM 25.
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Potentially breaking changes
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----------------------------
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- TODO: In LLVM 23, libc++ dropped a lot of transitive includes in all language modes. This improves compile time significantly,
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but causes programs which rely on these includes to not compile anymore. The ``_LIBCPP_KEEP_TRANSITIVE_INCLUDES_LLVM23``
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macro that was provided in LLVM 23 to ease the transition has been removed in this release.
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Announcements About Future Releases
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-----------------------------------
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ABI Affecting Changes
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---------------------
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- TODO: ``std::allocator`` is trivially default constructible since LLVM 22. In LLVM 23, the ``_LIBCPP_DEPRECATED_ABI_NON_TRIVIAL_ALLOCATOR``
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macro was provided as an escape hatch, but it has been removed in LLVM 24 since there was no evidence of it being useful.
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- TODO: ``bitset::operator[]`` returns ``bool`` since LLVM 22, fixing a conformance bug. In LLVM 23, the ``_LIBCPP_DEPRECATED_ABI_BITSET_CONST_SUBSCRIPT_RETURN_REF``
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macro was provided as an escape hatch, but it has been removed in LLVM 24 since there was no evidence of it being useful.
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Build System Changes
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--------------------
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