libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_month.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 year_month_day_last& operator+=(const months& m) noexcept;
  14 // constexpr year_month_day_last& operator-=(const months& m) noexcept;
  15
  16 #include <chrono>
  17 #include <cassert>
  18 #include <type_traits>
  19 #include <utility>
  20
  21 #include "test_macros.h"
  22
  23 using year                = std::chrono::year;
  24 using month               = std::chrono::month;
  25 using month_day_last      = std::chrono::month_day_last;
  26 using year_month_day_last = std::chrono::year_month_day_last;
  27 using months              = std::chrono::months;
  28
  29 constexpr bool test() {
  30   for (unsigned i = 0; i <= 10; ++i) {
  31     year y{1234};
  32     month_day_last mdl{month{i}};
  33     year_month_day_last ymdl(y, mdl);
  34     assert(static_cast<unsigned>((ymdl += months{2}).month()) == i + 2);
  35     assert(ymdl.year() == y);
  36     assert(static_cast<unsigned>((ymdl).month()) == i + 2);
  37     assert(ymdl.year() == y);
  38     assert(static_cast<unsigned>((ymdl -= months{1}).month()) == i + 1);
  39     assert(ymdl.year() == y);
  40     assert(static_cast<unsigned>((ymdl).month()) == i + 1);
  41     assert(ymdl.year() == y);
  42   }
  43
  44   { // Test year wrapping
  45     year_month_day_last ymdl{year{2020}, month_day_last{month{4}}};
  46
  47     ymdl += months{12};
  48     assert((ymdl == year_month_day_last{year{2021}, month_day_last{month{4}}}));
  49
  50     ymdl -= months{12};
  51     assert((ymdl == year_month_day_last{year{2020}, month_day_last{month{4}}}));
  52   }
  53
  54   return true;
  55 }
  56
  57 int main(int, char**) {
  58   ASSERT_NOEXCEPT(std::declval<year_month_day_last&>() += std::declval<months>());
  59   ASSERT_NOEXCEPT(std::declval<year_month_day_last&>() -= std::declval<months>());
  60
  61   ASSERT_SAME_TYPE(year_month_day_last&, decltype(std::declval<year_month_day_last&>() += std::declval<months>()));
  62   ASSERT_SAME_TYPE(year_month_day_last&, decltype(std::declval<year_month_day_last&>() -= std::declval<months>()));
  63
  64   test();
  65   static_assert(test());
  66
  67   return 0;
  68 }