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91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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_last;
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// constexpr year_month_day_last
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// operator-(const year_month_day_last& ymdl, const months& dm) noexcept;
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//
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// Returns: ymdl + (-dm).
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//
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// constexpr year_month_day_last
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// operator-(const year_month_day_last& ymdl, const years& dy) noexcept;
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//
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// Returns: ymdl + (-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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constexpr bool testConstexprYears (std::chrono::year_month_day_last ymdl)
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{
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std::chrono::year_month_day_last ym1 = ymdl - std::chrono::years{10};
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return
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ym1.year() == std::chrono::year{static_cast<int>(ymdl.year()) - 10}
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&& ym1.month() == ymdl.month()
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;
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}
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constexpr bool testConstexprMonths (std::chrono::year_month_day_last ymdl)
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{
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std::chrono::year_month_day_last ym1 = ymdl - std::chrono::months{6};
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return
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ym1.year() == ymdl.year()
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&& ym1.month() == std::chrono::month{static_cast<unsigned>(ymdl.month()) - 6}
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;
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}
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int main(int, char**)
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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 month_day_last = std::chrono::month_day_last;
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using year_month_day_last = std::chrono::year_month_day_last;
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using months = std::chrono::months;
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using years = std::chrono::years;
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constexpr month December = std::chrono::December;
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{ // year_month_day_last - years
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ASSERT_NOEXCEPT( std::declval<year_month_day_last>() - std::declval<years>());
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ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<years>()));
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static_assert(testConstexprYears(year_month_day_last{year{1234}, month_day_last{December}}), "");
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year_month_day_last ym{year{1234}, month_day_last{December}};
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for (int i = 0; i <= 10; ++i)
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{
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year_month_day_last ym1 = ym - years{i};
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assert(static_cast<int>(ym1.year()) == 1234 - i);
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assert(ym1.month() == December);
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}
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}
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{ // year_month_day_last - months
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ASSERT_NOEXCEPT( std::declval<year_month_day_last>() - std::declval<months>());
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ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<months>()));
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static_assert(testConstexprMonths(year_month_day_last{year{1234}, month_day_last{December}}), "");
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// TODO test wrapping
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year_month_day_last ym{year{1234}, month_day_last{December}};
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for (unsigned i = 0; i <= 10; ++i)
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{
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year_month_day_last ym1 = ym - months{i};
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assert(static_cast<int>(ym1.year()) == 1234);
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assert(static_cast<unsigned>(ym1.month()) == 12U-i);
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}
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}
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return 0;
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}
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