//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 // <chrono> // class year_month_day; // constexpr year_month_day operator+(const year_month_day& ymd, const months& dm) noexcept; // Returns: (ymd.year() / ymd.month() + dm) / ymd.day(). // // constexpr year_month_day operator+(const months& dm, const year_month_day& ymd) noexcept; // Returns: ymd + dm. // // // constexpr year_month_day operator+(const year_month_day& ymd, const years& dy) noexcept; // Returns: (ymd.year() + dy) / ymd.month() / ymd.day(). // // constexpr year_month_day operator+(const years& dy, const year_month_day& ymd) noexcept; // Returns: ym + dm. #include <chrono> #include <type_traits> #include <cassert> #include "test_macros.h" constexpr bool testConstexprYears(std::chrono::year_month_day 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_day 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() { using day = std::chrono::day; using year = std::chrono::year; using years = std::chrono::years; using month = std::chrono::month; using months = std::chrono::months; using year_month_day = std::chrono::year_month_day; { // year_month_day + months ASSERT_NOEXCEPT(std::declval<year_month_day>() + std::declval<months>()); ASSERT_NOEXCEPT(std::declval<months>() + std::declval<year_month_day>()); ASSERT_SAME_TYPE(year_month_day, decltype(std::declval<year_month_day>() + std::declval<months>())); ASSERT_SAME_TYPE(year_month_day, decltype(std::declval<months>() + std::declval<year_month_day>())); static_assert(testConstexprMonths(year_month_day{year{1}, month{1}, day{1}}), ""); year_month_day ym{year{1234}, std::chrono::January, day{12}}; for (int i = 0; i <= 10; ++i) // TODO test wrap-around { year_month_day ym1 = ym + months{i}; year_month_day 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.day() == day{12}); assert(ym2.day() == day{12}); assert(ym1 == ym2); } } { // year_month_day + years ASSERT_NOEXCEPT(std::declval<year_month_day>() + std::declval<years>()); ASSERT_NOEXCEPT(std::declval<years>() + std::declval<year_month_day>()); ASSERT_SAME_TYPE(year_month_day, decltype(std::declval<year_month_day>() + std::declval<years>())); ASSERT_SAME_TYPE(year_month_day, decltype(std::declval<years>() + std::declval<year_month_day>())); static_assert(testConstexprYears (year_month_day{year{1}, month{1}, day{1}}), ""); year_month_day ym{year{1234}, std::chrono::January, day{12}}; for (int i = 0; i <= 10; ++i) { year_month_day ym1 = ym + years{i}; year_month_day 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.day() == day{12}); assert(ym2.day() == day{12}); assert(ym1 == ym2); } } }