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101 lines
3.5 KiB
C++
101 lines
3.5 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_weekday;
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// constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const months& dm) noexcept;
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// Returns: ymwd + (-dm).
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//
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// constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const years& dy) noexcept;
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// Returns: ymwd + (-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 testConstexprYears ()
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{
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std::chrono::year_month_weekday ym0{std::chrono::year{1234}, std::chrono::January, std::chrono::weekday_indexed{std::chrono::Tuesday, 1}};
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std::chrono::year_month_weekday 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.weekday() == std::chrono::Tuesday
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&& ym1.index() == 1
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;
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}
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constexpr bool testConstexprMonths ()
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{
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std::chrono::year_month_weekday ym0{std::chrono::year{1234}, std::chrono::November, std::chrono::weekday_indexed{std::chrono::Tuesday, 1}};
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std::chrono::year_month_weekday ym1 = ym0 - std::chrono::months{6};
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return
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ym1.year() == std::chrono::year{1234}
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&& ym1.month() == std::chrono::May
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&& ym1.weekday() == std::chrono::Tuesday
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&& ym1.index() == 1
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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 weekday = std::chrono::weekday;
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using weekday_indexed = std::chrono::weekday_indexed;
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using year_month_weekday = std::chrono::year_month_weekday;
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using years = std::chrono::years;
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using months = std::chrono::months;
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constexpr month November = std::chrono::November;
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constexpr weekday Tuesday = std::chrono::Tuesday;
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{ // year_month_weekday - years
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ASSERT_NOEXCEPT( std::declval<year_month_weekday>() - std::declval<years>());
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ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<years>()));
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static_assert(testConstexprYears(), "");
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year_month_weekday ym{year{1234}, November, weekday_indexed{Tuesday, 1}};
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for (int i = 0; i <= 10; ++i)
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{
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year_month_weekday ym1 = ym - years{i};
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assert(static_cast<int>(ym1.year()) == 1234 - i);
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assert(ym1.month() == November);
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assert(ym1.weekday() == Tuesday);
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assert(ym1.index() == 1);
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}
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}
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{ // year_month_weekday - months
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ASSERT_NOEXCEPT( std::declval<year_month_weekday>() - std::declval<months>());
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ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<months>()));
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static_assert(testConstexprMonths(), "");
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year_month_weekday ym{year{1234}, November, weekday_indexed{Tuesday, 2}};
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for (unsigned i = 1; i <= 10; ++i)
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{
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year_month_weekday ym1 = ym - months{i};
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assert(ym1.year() == year{1234});
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assert(ym1.month() == month{11-i});
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assert(ym1.weekday() == Tuesday);
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assert(ym1.index() == 2);
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}
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}
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}
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