libcxx/test/std/time/time.zone/time.zone.zonedtime/time.zone.zonedtime.ctor/zoned_time_duration2.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10 // UNSUPPORTED: no-filesystem, no-localization, no-tzdb
  11
  12 // XFAIL: libcpp-has-no-experimental-tzdb
  13 // XFAIL: availability-tzdb-missing
  14
  15 // <chrono>
  16
  17 // template<class Duration, class TimeZonePtr = const time_zone*>
  18 // class zoned_time;
  19
  20 // template<class Duration2>
  21 // zoned_time(const zoned_time<Duration2, TimeZonePtr>& y);
  22
  23 #include <chrono>
  24 #include <concepts>
  25 #include <cassert>
  26
  27 namespace cr = std::chrono;
  28
  29 int main(int, char**) {
  30   // is_convertible_v<sys_time<Duration2>, sys_time<Duration>> is true.
  31   {
  32     using duration   = cr::microseconds;
  33     using time_point = cr::sys_time<duration>;
  34     cr::zoned_time<duration> zt{time_point{duration{42}}};
  35
  36     using duration2   = cr::nanoseconds;
  37     using time_point2 = cr::sys_time<duration2>;
  38     static_assert(std::constructible_from<cr::zoned_time<duration2>, cr::zoned_time<duration>>);
  39     cr::zoned_time<duration2> zt2{zt};
  40
  41     assert(zt2.get_sys_time() == time_point2{duration2{42'000}});
  42   }
  43   {
  44     using duration   = cr::milliseconds;
  45     using time_point = cr::sys_time<duration>;
  46     cr::zoned_time<duration> zt{time_point{duration{42}}};
  47
  48     using duration2   = cr::nanoseconds;
  49     using time_point2 = cr::sys_time<duration2>;
  50     static_assert(std::constructible_from<cr::zoned_time<duration2>, cr::zoned_time<duration>>);
  51     cr::zoned_time<duration2> zt2{zt};
  52
  53     assert(zt2.get_sys_time() == time_point2{duration2{42'000'000}});
  54   }
  55   {
  56     using duration   = cr::seconds;
  57     using time_point = cr::sys_time<duration>;
  58     cr::zoned_time<duration> zt{time_point{duration{42}}};
  59
  60     using duration2   = cr::nanoseconds;
  61     using time_point2 = cr::sys_time<duration2>;
  62     static_assert(std::constructible_from<cr::zoned_time<duration2>, cr::zoned_time<duration>>);
  63     cr::zoned_time<duration2> zt2{zt};
  64
  65     assert(zt2.get_sys_time() == time_point2{duration2{42'000'000'000}});
  66   }
  67   // is_convertible_v<sys_time<Duration2>, sys_time<Duration>> is false.
  68   {
  69     using duration = cr::milliseconds;
  70
  71     using duration2 = cr::seconds;
  72     static_assert(!std::constructible_from<cr::zoned_time<duration2>, cr::zoned_time<duration>>);
  73   }
  74   {
  75     using duration = cr::microseconds;
  76
  77     using duration2 = cr::seconds;
  78     static_assert(!std::constructible_from<cr::zoned_time<duration2>, cr::zoned_time<duration>>);
  79   }
  80   {
  81     using duration = cr::nanoseconds;
  82
  83     using duration2 = cr::seconds;
  84     static_assert(!std::constructible_from<cr::zoned_time<duration2>, cr::zoned_time<duration>>);
  85   }
  86
  87   return 0;
  88 }