| //===----------------------------------------------------------------------===// |
| // |
| // 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 month; |
| |
| // constexpr month& operator+=(const month& d) noexcept; |
| // constexpr month& operator-=(const month& d) noexcept; |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| template <typename M, typename Ms> |
| constexpr bool testConstexpr() |
| { |
| M m1{1}; |
| if (static_cast<unsigned>(m1 += Ms{ 1}) != 2) return false; |
| if (static_cast<unsigned>(m1 += Ms{ 2}) != 4) return false; |
| if (static_cast<unsigned>(m1 += Ms{ 8}) != 12) return false; |
| if (static_cast<unsigned>(m1 -= Ms{ 1}) != 11) return false; |
| if (static_cast<unsigned>(m1 -= Ms{ 2}) != 9) return false; |
| if (static_cast<unsigned>(m1 -= Ms{ 8}) != 1) return false; |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| using month = std::chrono::month; |
| using months = std::chrono::months; |
| |
| ASSERT_NOEXCEPT(std::declval<month&>() += std::declval<months&>()); |
| ASSERT_NOEXCEPT(std::declval<month&>() -= std::declval<months&>()); |
| ASSERT_SAME_TYPE(month&, decltype(std::declval<month&>() += std::declval<months&>())); |
| ASSERT_SAME_TYPE(month&, decltype(std::declval<month&>() -= std::declval<months&>())); |
| |
| static_assert(testConstexpr<month, months>(), ""); |
| |
| for (unsigned i = 1; i <= 10; ++i) |
| { |
| month month(i); |
| int exp = i + 10; |
| while (exp > 12) |
| exp -= 12; |
| assert(static_cast<unsigned>(month += months{10}) == static_cast<unsigned>(exp)); |
| assert(static_cast<unsigned>(month) == static_cast<unsigned>(exp)); |
| } |
| |
| for (unsigned i = 1; i <= 10; ++i) |
| { |
| month month(i); |
| int exp = i - 9; |
| while (exp < 1) |
| exp += 12; |
| assert(static_cast<unsigned>(month -= months{ 9}) == static_cast<unsigned>(exp)); |
| assert(static_cast<unsigned>(month) == static_cast<unsigned>(exp)); |
| } |
| |
| return 0; |
| } |