libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_local_days.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
   9
  10 // <chrono>
  11 // class year_month_day_last;
  12
  13 // constexpr operator local_days() const noexcept;
  14 //  Returns: local_days{sys_days{*this}.time_since_epoch()}.
  15
  16 #include <chrono>
  17 #include <cassert>
  18 #include <type_traits>
  19 #include <utility>
  20
  21 #include "test_macros.h"
  22
  23 int main(int, char**)
  24 {
  25     using year                = std::chrono::year;
  26     using month_day_last      = std::chrono::month_day_last;
  27     using year_month_day_last = std::chrono::year_month_day_last;
  28     using local_days          = std::chrono::local_days;
  29     using days                = std::chrono::days;
  30
  31     ASSERT_NOEXCEPT(                      static_cast<local_days>(std::declval<const year_month_day_last>()));
  32     ASSERT_SAME_TYPE(local_days, decltype(static_cast<local_days>(std::declval<const year_month_day_last>())));
  33
  34     { // Last day in Jan 1970 was the 31st
  35     constexpr year_month_day_last ymdl{year{1970}, month_day_last{std::chrono::January}};
  36     constexpr local_days sd{ymdl};
  37
  38     static_assert(sd.time_since_epoch() == days{30}, "");
  39     }
  40
  41     {
  42     constexpr year_month_day_last ymdl{year{2000}, month_day_last{std::chrono::January}};
  43     constexpr local_days sd{ymdl};
  44
  45     static_assert(sd.time_since_epoch() == days{10957+30}, "");
  46     }
  47
  48     {
  49     constexpr year_month_day_last ymdl{year{1940}, month_day_last{std::chrono::January}};
  50     constexpr local_days sd{ymdl};
  51
  52     static_assert(sd.time_since_epoch() == days{-10957+29}, "");
  53     }
  54
  55     {
  56     year_month_day_last ymdl{year{1939}, month_day_last{std::chrono::November}};
  57     local_days sd{ymdl};
  58
  59     assert(sd.time_since_epoch() == days{-(10957+33)});
  60     }
  61
  62   return 0;
  63 }