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61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <chrono>
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// class year_month_day;
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// constexpr year_month_day operator-(const year_month_day& ymd, const years& dy) noexcept;
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// Returns: ymd + (-dy)
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#include <chrono>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include <iostream>
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constexpr bool test_constexpr ()
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{
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std::chrono::year_month_day ym0{std::chrono::year{1234}, std::chrono::January, std::chrono::day{12}};
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std::chrono::year_month_day ym1 = ym0 - std::chrono::years{10};
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return
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ym1.year() == std::chrono::year{1234-10}
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&& ym1.month() == std::chrono::January
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&& ym1.day() == std::chrono::day{12}
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;
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}
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int main()
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{
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using year = std::chrono::year;
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using month = std::chrono::month;
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using day = std::chrono::day;
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using year_month_day = std::chrono::year_month_day;
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using years = std::chrono::years;
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ASSERT_NOEXCEPT( std::declval<year_month_day>() - std::declval<years>());
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ASSERT_SAME_TYPE(year_month_day, decltype(std::declval<year_month_day>() - std::declval<years>()));
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constexpr month January = std::chrono::January;
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static_assert(test_constexpr(), "");
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year_month_day ym{year{1234}, January, day{10}};
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for (int i = 0; i <= 10; ++i)
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{
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year_month_day ym1 = ym - years{i};
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assert(static_cast<int>(ym1.year()) == 1234 - i);
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assert(ym1.month() == January);
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assert(ym1.day() == day{10});
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}
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}
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