| //===----------------------------------------------------------------------===// |
| // |
| // 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++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 + -dy. |
| // |
| // constexpr year_month operator-(const year_month& ym, const months& dm) noexcept; |
| // Returns: ym + -dm. |
| // |
| // constexpr months operator-(const year_month& x, const year_month& y) noexcept; |
| // Returns: x.year() - y.year() + months{static_cast<int>(unsigned{x.month()}) - |
| // static_cast<int>(unsigned{y.month()})} |
| |
| #include <chrono> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| 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; |
| |
| constexpr bool test() { |
| { // year_month - years |
| |
| year_month ym{year{1234}, std::chrono::January}; |
| for (int i = 0; i <= 10; ++i) { |
| year_month ym1 = ym - years{i}; |
| assert(static_cast<int>(ym1.year()) == 1234 - i); |
| assert(ym1.month() == std::chrono::January); |
| } |
| } |
| |
| { // year_month - months |
| |
| year_month ym{year{1234}, std::chrono::November}; |
| for (int i = 0; i <= 10; ++i) { |
| year_month ym1 = ym - months{i}; |
| assert(static_cast<int>(ym1.year()) == 1234); |
| assert(ym1.month() == month(11 - i)); |
| } |
| // Test the year wraps around. |
| for (int i = 12; i <= 15; ++i) { |
| year_month ym1 = ym - months{i}; |
| assert(static_cast<int>(ym1.year()) == 1233); |
| assert(ym1.month() == month(11 - i + 12)); |
| } |
| } |
| |
| { // year_month - year_month |
| |
| // Same year |
| year y{2345}; |
| for (int i = 1; i <= 12; ++i) |
| for (int j = 1; j <= 12; ++j) { |
| months diff = year_month{y, month(i)} - year_month{y, month(j)}; |
| assert(diff.count() == i - j); |
| } |
| |
| // TODO: different year |
| } |
| return true; |
| } |
| |
| int main(int, char**) { |
| // year_month - years |
| ASSERT_NOEXCEPT(std::declval<year_month>() - std::declval<years>()); |
| ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() - std::declval<years>())); |
| |
| // year_month - months |
| ASSERT_NOEXCEPT(std::declval<year_month>() - std::declval<months>()); |
| ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() - std::declval<months>())); |
| |
| // year_month - year_month |
| ASSERT_NOEXCEPT(std::declval<year_month>() - std::declval<year_month>()); |
| ASSERT_SAME_TYPE(months, decltype(std::declval<year_month>() - std::declval<year_month>())); |
| |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |