| //===----------------------------------------------------------------------===// |
| // |
| // 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 weekday; |
| |
| // constexpr weekday& operator--() noexcept; |
| // constexpr weekday operator--(int) noexcept; |
| |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "../../euclidian.h" |
| |
| template <typename WD> |
| constexpr bool testConstexpr() |
| { |
| WD wd{1}; |
| if (static_cast<unsigned>(--wd) != 0) return false; |
| if (static_cast<unsigned>(wd--) != 0) return false; |
| if (static_cast<unsigned>(wd) != 6) return false; |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| using weekday = std::chrono::weekday; |
| ASSERT_NOEXCEPT(--(std::declval<weekday&>()) ); |
| ASSERT_NOEXCEPT( (std::declval<weekday&>())--); |
| |
| ASSERT_SAME_TYPE(weekday , decltype( std::declval<weekday&>()--)); |
| ASSERT_SAME_TYPE(weekday&, decltype(--std::declval<weekday&>() )); |
| |
| static_assert(testConstexpr<weekday>(), ""); |
| |
| for (unsigned i = 0; i <= 6; ++i) |
| { |
| weekday wd(i); |
| assert((static_cast<unsigned>(--wd) == euclidian_subtraction<unsigned, 0, 6>(i, 1))); |
| assert((static_cast<unsigned>(wd--) == euclidian_subtraction<unsigned, 0, 6>(i, 1))); |
| assert((static_cast<unsigned>(wd) == euclidian_subtraction<unsigned, 0, 6>(i, 2))); |
| } |
| |
| return 0; |
| } |