[all-commits] [llvm/llvm-project] 9243f9: [libc] Add support for C++20 'atomic_ref' type (#1...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9243f99d17c0165800fd1f2f92c5c975cf702414
      https://github.com/llvm/llvm-project/commit/9243f99d17c0165800fd1f2f92c5c975cf702414
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2025-03-25 (Tue, 25 Mar 2025)

  Changed paths:
    M libc/src/__support/CPP/atomic.h
    M libc/test/src/__support/CPP/atomic_test.cpp

  Log Message:
  -----------
  [libc] Add support for C++20 'atomic_ref' type (#132302)

Summary:
C++20 introduced an atomic reference type, which more easily wraps
around the standard way of dealing with atomics. Instead of a dedicated
type, it allows you to treat an existing allocation as atomic.

This has no users yet, but I'm hoping to use it when I start finalizing
my GPU allocation interface, as it will need to handle atomic values
in-place that can't be done with placement new. Hopefully this is small
enough that we can just keep it in-tree until it's needed, but I'll
accept holding it here until it has a user.

I added one extension to allow implicit conversion and CTAD.



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