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This patch updates the libc++ release notes. I have picked out several features/fixes/updates that I think are worth mentioning. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/branches/release_90@370514 91177308-0d34-0410-b5e6-96231b3b80d8
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2.2 KiB
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61 lines
2.2 KiB
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==========================
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Libc++ 9.0.0 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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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 9.0.0. 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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What's New in Libc++ 9.0.0?
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===========================
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Fixes
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-----
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* Minor fixes to ``std::chrono`` operators.
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* libc++ now correctly handles Objective-C++ ARC qualifiers in ``std::is_pointer``.
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* ``std::span`` general updates and fixes.
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* Updates to the ``std::abs`` implementation.
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* ``std::to_chars`` now adds leading zeros.
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* Ensure ``std::tuple`` is trivially constructible.
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* ``std::aligned_union`` now works in C++03.
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* Output of nullptr to ``std::basic_ostream`` is formatted properly.
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Features
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--------
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* Implemented P0608: sane variant converting constructor.
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* Added ``ssize`` function.
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* Added ``front`` and ``back`` methods in ``std::span``.
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* ``std::is_unbounded_array`` and ``std::is_bounded_array`` added to type traits.
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* ``std::atomic`` now includes many new features and specialization including improved Freestanding support.
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* Added ``std::midpoint`` and ``std::lerp`` math functions.
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* Added the function ``std::is_constant_evaluated``.
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* Erase-like algorithms now return size type.
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* Added ``contains`` method to container types.
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* ``std::swap`` is now a constant expression.
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Updates
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-------
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* libc++ dropped support for GCC 4.9; we now support GCC 5.1 and above.
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* libc++ added explicit support for WebAssembly System Interface (WASI).
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* Progress towards full support of rvalues and variadics in C++03 mode. ``std::move`` and ``std::forward`` now both work in C++03 mode.
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