[libcxx-commits] [libcxx] [libc++][TZDB] Adds basics of zoned_time class. (PR #94999)

[Louis Dionne via libcxx-commits]

================
@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+// UNSUPPORTED: no-filesystem, no-localization, no-tzdb
+
+// XFAIL: libcpp-has-no-experimental-tzdb
+// XFAIL: availability-tzdb-missing
+
+// <chrono>
+
+// template<class Duration, class TimeZonePtr = const time_zone*>
+// class zoned_time;
+//
+// zoned_time& operator=(const zoned_time&) = default;
+
+#include <cassert>
+#include <chrono>
+
+int main(int, char**) {
+  std::chrono::zoned_time<std::chrono::seconds> zt{std::chrono::sys_seconds{std::chrono::seconds{42}}};
+  assert(zt.get_time_zone() == std::chrono::locate_zone("UTC"));
+  assert(zt.get_sys_time() == std::chrono::sys_seconds{std::chrono::seconds{42}});
+
+  std::chrono::zoned_time<std::chrono::seconds> copy;
+  copy = zt;
----------------
ldionne wrote:

```
std::same_as<zoned_time&> decltype(auto) result = (copy = zt);
assert(&result == &copy);
```

https://github.com/llvm/llvm-project/pull/94999