[libcxx-commits] [libcxx] [libc++] P0718R2: Implementation of std::atomic<shared_ptr<T>> and std::atomic<weak_ptr<T>> (PR #194215)

[Hristo Hristov via libcxx-commits]

================
@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+// 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++20
+// UNSUPPORTED: no-threads
+
+// bool compare_exchange_strong(weak_ptr<T>&, weak_ptr<T>, memory_order, memory_order) noexcept;
+// bool compare_exchange_strong(weak_ptr<T>&, weak_ptr<T>, memory_order = memory_order_seq_cst) noexcept;
+
+#include <atomic>
+#include <cassert>
+#include <concepts> // needed on Armv7/Armv8 with -fmodules
----------------
Zingam wrote:

```suggestion
#include <concepts>
```

https://github.com/llvm/llvm-project/pull/194215