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

[Louis Dionne via libcxx-commits]

================
@@ -0,0 +1,59 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 {
+//  public:
+//    using duration = common_type_t<Duration, seconds>;
+//  ...
+//    zoned_time(const zoned_time&) = default;
+//    zoned_time& operator=(const zoned_time&) = default;
+//
+//  };
+
+#include <chrono>
+#include <concepts>
+#include <type_traits>
+#include <memory>
+
----------------
ldionne wrote:

Let's add a test like this:

```
static_assert(is_same_v<zoned_time<Duration>, zoned_time<Duration, const time_zone*>>);
```

for the default template argument.

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