| //===----------------------------------------------------------------------===// |
| // |
| // 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 year_month; |
| |
| // constexpr year_month operator+(const year_month& ym, const years& dy) noexcept; |
| // Returns: (ym.year() + dy) / ym.month(). |
| // |
| // constexpr year_month operator+(const years& dy, const year_month& ym) noexcept; |
| // Returns: ym + dy. |
| // |
| // constexpr year_month operator+(const year_month& ym, const months& dm) noexcept; |
| // Returns: A year_month value z such that z - ym == dm. |
| // Complexity: O(1) with respect to the value of dm. |
| // |
| // constexpr year_month operator+(const months& dm, const year_month& ym) noexcept; |
| // Returns: ym + dm. |
| |
| |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| constexpr bool testConstexprYears(std::chrono::year_month ym) |
| { |
| std::chrono::years offset{23}; |
| if (static_cast<int>((ym ).year()) != 1) return false; |
| if (static_cast<int>((ym + offset).year()) != 24) return false; |
| if (static_cast<int>((offset + ym).year()) != 24) return false; |
| return true; |
| } |
| |
| |
| constexpr bool testConstexprMonths(std::chrono::year_month ym) |
| { |
| std::chrono::months offset{6}; |
| if (static_cast<unsigned>((ym ).month()) != 1) return false; |
| if (static_cast<unsigned>((ym + offset).month()) != 7) return false; |
| if (static_cast<unsigned>((offset + ym).month()) != 7) return false; |
| return true; |
| } |
| |
| |
| int main(int, char**) |
| { |
| using year = std::chrono::year; |
| using years = std::chrono::years; |
| using month = std::chrono::month; |
| using months = std::chrono::months; |
| using year_month = std::chrono::year_month; |
| |
| { // year_month + years |
| ASSERT_NOEXCEPT(std::declval<year_month>() + std::declval<years>()); |
| ASSERT_NOEXCEPT(std::declval<years>() + std::declval<year_month>()); |
| |
| ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<years>())); |
| ASSERT_SAME_TYPE(year_month, decltype(std::declval<years>() + std::declval<year_month>())); |
| |
| static_assert(testConstexprYears (year_month{year{1}, month{1}}), ""); |
| |
| year_month ym{year{1234}, std::chrono::January}; |
| for (int i = 0; i <= 10; ++i) |
| { |
| year_month ym1 = ym + years{i}; |
| year_month ym2 = years{i} + ym; |
| assert(static_cast<int>(ym1.year()) == i + 1234); |
| assert(static_cast<int>(ym2.year()) == i + 1234); |
| assert(ym1.month() == std::chrono::January); |
| assert(ym2.month() == std::chrono::January); |
| assert(ym1 == ym2); |
| } |
| } |
| |
| { // year_month + months |
| ASSERT_NOEXCEPT(std::declval<year_month>() + std::declval<months>()); |
| ASSERT_NOEXCEPT(std::declval<months>() + std::declval<year_month>()); |
| |
| ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<months>())); |
| ASSERT_SAME_TYPE(year_month, decltype(std::declval<months>() + std::declval<year_month>())); |
| |
| static_assert(testConstexprMonths(year_month{year{1}, month{1}}), ""); |
| |
| year_month ym{year{1234}, std::chrono::January}; |
| for (int i = 0; i <= 10; ++i) // TODO test wrap-around |
| { |
| year_month ym1 = ym + months{i}; |
| year_month ym2 = months{i} + ym; |
| assert(static_cast<int>(ym1.year()) == 1234); |
| assert(static_cast<int>(ym2.year()) == 1234); |
| assert(ym1.month() == month(1 + i)); |
| assert(ym2.month() == month(1 + i)); |
| assert(ym1 == ym2); |
| } |
| } |
| |
| return 0; |
| } |