[llvm-branch-commits] [libcxx] [libc++][TZDB] Finishes zoned_time constructors. (PR #95010)

[Louis Dionne via llvm-branch-commits]

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@@ -0,0 +1,105 @@
+//===----------------------------------------------------------------------===/
+//
+// 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(string_view name, const local_time<Duration>& st, choose c);
+
+#include <chrono>
+#include <concepts>
+#include <cassert>
+
+#include "test_offset_time_zone.h"
+
+int main(int, char**) {
+  // Tests unique conversions. To make sure the test is does not depend on changes
+  // in the database it uses a time zone with a fixed offset.
+  {
+    std::chrono::zoned_time<std::chrono::seconds> zt{
+        "Etc/GMT+1", std::chrono::local_seconds{std::chrono::seconds{0}}, std::chrono::choose::earliest};
+
+    assert(zt.get_time_zone() == std::chrono::locate_zone("Etc/GMT+1"));
+    assert(zt.get_sys_time() == std::chrono::sys_seconds{std::chrono::hours{1}});
+  }
+
+  // Tests ambiguous conversions.
+  {
+    // Z Europe/Berlin 0:53:28 - LMT 1893 Ap
+    // ...
+    // 1 DE CE%sT 1980
+    // 1 E CE%sT
+    //
+    // ...
+    // R E 1981 ma - Mar lastSu 1u 1 S
+    // R E 1996 ma - O lastSu 1u 0 -
+
+    using namespace std::literals::chrono_literals;
+    {
+      std::chrono::zoned_time<std::chrono::seconds> zt{
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ldionne wrote:

You could consider using `namespace cr = std::chrono` to shorten these tests.

https://github.com/llvm/llvm-project/pull/95010