[libcxx-commits] [libcxx] [libc++] Implement P0493R5: Atomic minimum/maximum (PR #180333)

[Hristo Hristov via libcxx-commits]

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@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: std-at-least-c++26
+// XFAIL: !has-64-bit-atomics
+
+// <atomic>
+
+// template<class T>
+//     T
+//     atomic_fetch_max(volatile atomic<T>*, atomic<T>::value_type) noexcept;
+//
+// template<class T>
+//     T
+//     atomic_fetch_max(atomic<T>*, atomic<T>::value_type) noexcept;
----------------
H-G-Hristov wrote:

```suggestion
//  template<class T>
//    T atomic_fetch_max(volatile atomic<T>*, typename atomic<T>::value_type) noexcept;
//  template<class T>
//    constexpr T atomic_fetch_max(atomic<T>*, typename atomic<T>::value_type) noexcept;
```

The formatting of the synopsis looks odd. Can you copy those from the standard:

https://wg21.link/atomics.syn#header:%3catomic%3e

https://github.com/llvm/llvm-project/pull/180333