| //===----------------------------------------------------------------------===// |
| // |
| // 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 day& x, const days& y) noexcept; |
| // Returns: x + -y. |
| // |
| // constexpr days operator-(const day& x, const day& y) noexcept; |
| // Returns: days{int(unsigned{x}) - int(unsigned{y}). |
| |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| template <typename D, typename Ds> |
| constexpr bool testConstexpr() |
| { |
| D d{23}; |
| Ds offset{6}; |
| if (d - offset != D{17}) return false; |
| if (d - D{17} != offset) 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<day>()); |
| |
| ASSERT_SAME_TYPE(day, decltype(std::declval<day>() - std::declval<days>())); |
| ASSERT_SAME_TYPE(days, decltype(std::declval<day>() - std::declval<day>())); |
| |
| static_assert(testConstexpr<day, days>(), ""); |
| |
| day dy{12}; |
| for (unsigned i = 0; i <= 10; ++i) |
| { |
| day d1 = dy - days{i}; |
| days off = dy - day {i}; |
| assert(static_cast<unsigned>(d1) == 12 - i); |
| assert(off.count() == static_cast<int>(12 - i)); // days is signed |
| } |
| |
| return 0; |
| } |