libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_year.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;
  12
  13 // constexpr year_month_day& operator+=(const years& d) noexcept;
  14 // constexpr year_month_day& operator-=(const years& d) 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 day            = std::chrono::day;
  26 using year_month_day = std::chrono::year_month_day;
  27 using years          = std::chrono::years;
  28
  29 constexpr bool test() {
  30   for (int i = 1000; i <= 1010; ++i) {
  31     month m{2};
  32     day d{23};
  33     year_month_day ym(year{i}, m, d);
  34     assert(static_cast<int>((ym += years{2}).year()) == i + 2);
  35     assert(ym.month() == m);
  36     assert(ym.day() == d);
  37     assert(static_cast<int>((ym).year()) == i + 2);
  38     assert(ym.month() == m);
  39     assert(ym.day() == d);
  40     assert(static_cast<int>((ym -= years{1}).year()) == i + 1);
  41     assert(ym.month() == m);
  42     assert(ym.day() == d);
  43     assert(static_cast<int>((ym).year()) == i + 1);
  44     assert(ym.month() == m);
  45     assert(ym.day() == d);
  46   }
  47
  48   return true;
  49 }
  50
  51 int main(int, char**) {
  52   ASSERT_NOEXCEPT(std::declval<year_month_day&>() += std::declval<years>());
  53   ASSERT_NOEXCEPT(std::declval<year_month_day&>() -= std::declval<years>());
  54
  55   ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() += std::declval<years>()));
  56   ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() -= std::declval<years>()));
  57
  58   test();
  59   static_assert(test());
  60
  61   return 0;
  62 }