Commit fa0bc006 authored by Zoe Carver's avatar Zoe Carver
Browse files

Update libc++ release notes 

This patch updates the libc++ release notes.
I have picked out several features/fixes/updates
that I think are worth mentioning.

llvm-svn: 370514
parent 1cf7a880

libcxx/docs/ReleaseNotes.rst

+33 −0
Original line number Diff line number Diff line
@@ -25,3 +25,36 @@ For more information about libc++, please see the `Libc++ Web Site 


What's New in Libc++ 9.0.0?

===========================



Fixes

-----



* Minor fixes to ``std::chrono`` operators.

* libc++ now correctly handles Objective-C++ ARC qualifiers in ``std::is_pointer``.

* ``std::span`` general updates and fixes.

* Updates to the ``std::abs`` implementation.

* ``std::to_chars`` now adds leading zeros.

* Ensure ``std::tuple`` is trivially constructible.

* ``std::aligned_union`` now works in C++03.

* Output of nullptr to ``std::basic_ostream`` is formatted properly.



Features

--------



* Implemented P0608: sane variant converting constructor.

* Added ``ssize`` function.

* Added ``front`` and ``back`` methods in ``std::span``.

* ``std::is_unbounded_array`` and ``std::is_bounded_array`` added to type traits.

* ``std::atomic`` now includes many new features and specialization including improved Freestanding support.

* Added ``std::midpoint`` and ``std::lerp`` math functions.

* Added the function ``std::is_constant_evaluated``.

* Erase-like algorithms now return size type.

* Added ``contains`` method to container types.

* ``std::swap`` is now a constant expression.



Updates

-------



* libc++ dropped support for GCC 4.9; we now support GCC 5.1 and above.

* libc++ added explicit support for WebAssembly System Interface (WASI).

* Progress towards full support of rvalues and variadics in C++03 mode. ``std::move`` and ``std::forward`` now both work in C++03 mode.