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92 lines
3.0 KiB
C++
92 lines
3.0 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;
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// constexpr year_month operator-(const year_month& ym, const years& dy) noexcept;
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// Returns: ym + -dy.
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//
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// constexpr year_month operator-(const year_month& ym, const months& dm) noexcept;
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// Returns: ym + -dm.
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//
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// constexpr months operator-(const year_month& x, const year_month& y) noexcept;
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// Returns: x.year() - y.year() + months{static_cast<int>(unsigned{x.month()}) -
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// static_cast<int>(unsigned{y.month()})}
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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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int main(int, char**)
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{
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using year = std::chrono::year;
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using years = std::chrono::years;
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using month = std::chrono::month;
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using months = std::chrono::months;
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using year_month = std::chrono::year_month;
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{ // year_month - years
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ASSERT_NOEXCEPT( std::declval<year_month>() - std::declval<years>());
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ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() - std::declval<years>()));
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// static_assert(testConstexprYears (year_month{year{1}, month{1}}), "");
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year_month ym{year{1234}, std::chrono::January};
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for (int i = 0; i <= 10; ++i)
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{
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year_month ym1 = ym - years{i};
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assert(static_cast<int>(ym1.year()) == 1234 - i);
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assert(ym1.month() == std::chrono::January);
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}
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}
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{ // year_month - months
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ASSERT_NOEXCEPT( std::declval<year_month>() - std::declval<months>());
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ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() - std::declval<months>()));
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// static_assert(testConstexprMonths(year_month{year{1}, month{1}}), "");
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year_month ym{year{1234}, std::chrono::November};
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for (int i = 0; i <= 10; ++i) // TODO test wrap-around
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{
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year_month ym1 = ym - months{i};
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assert(static_cast<int>(ym1.year()) == 1234);
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assert(ym1.month() == month(11 - i));
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}
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}
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{ // year_month - year_month
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ASSERT_NOEXCEPT( std::declval<year_month>() - std::declval<year_month>());
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ASSERT_SAME_TYPE(months, decltype(std::declval<year_month>() - std::declval<year_month>()));
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// static_assert(testConstexprMonths(year_month{year{1}, month{1}}), "");
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// Same year
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year y{2345};
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for (int i = 1; i <= 12; ++i)
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for (int j = 1; j <= 12; ++j)
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{
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months diff = year_month{y, month(i)} - year_month{y, month(j)};
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std::cout << "i: " << i << " j: " << j << " -> " << diff.count() << std::endl;
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assert(diff.count() == i - j);
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}
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// TODO: different year
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}
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return 0;
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}
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