[libcxx-commits] [libcxx] [libc++] Implement C++20 atomic_ref (PR #76647)

[Louis Dionne via libcxx-commits]

================
@@ -0,0 +1,47 @@
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// operator T() const noexcept;
+
+#include <atomic>
+#include <cassert>
+#include <type_traits>
+
+#include "test_macros.h"
+
+template <typename T>
+void test_convert() {
+  T x(T(1));
+  std::atomic_ref<T> a(x);
+
+  assert(a == T(1));
----------------
ldionne wrote:

I think the best we can do here would be:

```c++
T converted = a;
assert(converted == T(1));
```

https://github.com/llvm/llvm-project/pull/76647