| //===----------------------------------------------------------------------===// |
| // |
| // 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++98, c++03, c++11, c++14, c++17 |
| |
| // <chrono> |
| // class day; |
| |
| // constexpr day& operator+=(const days& d) noexcept; |
| // constexpr day& operator-=(const days& d) noexcept; |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| template <typename D, typename Ds> |
| constexpr bool testConstexpr() |
| { |
| D d1{1}; |
| if (static_cast<unsigned>(d1 += Ds{ 1}) != 2) return false; |
| if (static_cast<unsigned>(d1 += Ds{ 2}) != 4) return false; |
| if (static_cast<unsigned>(d1 += Ds{22}) != 26) return false; |
| if (static_cast<unsigned>(d1 -= Ds{ 1}) != 25) return false; |
| if (static_cast<unsigned>(d1 -= Ds{ 2}) != 23) return false; |
| if (static_cast<unsigned>(d1 -= Ds{22}) != 1) return false; |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| using day = std::chrono::day; |
| using days = std::chrono::days; |
| |
| ASSERT_NOEXCEPT(std::declval<day&>() += std::declval<days>()); |
| ASSERT_NOEXCEPT(std::declval<day&>() -= std::declval<days>()); |
| |
| ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() += std::declval<days>())); |
| ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() -= std::declval<days>())); |
| |
| static_assert(testConstexpr<day, days>(), ""); |
| |
| for (unsigned i = 0; i <= 10; ++i) |
| { |
| day day(i); |
| assert(static_cast<unsigned>(day += days{22}) == i + 22); |
| assert(static_cast<unsigned>(day) == i + 22); |
| assert(static_cast<unsigned>(day -= days{12}) == i + 10); |
| assert(static_cast<unsigned>(day) == i + 10); |
| } |
| |
| return 0; |
| } |