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108 lines
3.7 KiB
C++
108 lines
3.7 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.year() + dy) / ym.month().
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//
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// constexpr year_month operator+(const years& dy, const year_month& ym) 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: A year_month value z such that z - ym == dm.
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// Complexity: O(1) with respect to the value of dm.
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//
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// constexpr year_month operator+(const months& dm, const year_month& ym) noexcept;
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// Returns: ym + dm.
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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 ym)
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{
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std::chrono::years offset{23};
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if (static_cast<int>((ym ).year()) != 1) return false;
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if (static_cast<int>((ym + offset).year()) != 24) return false;
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if (static_cast<int>((offset + ym).year()) != 24) return false;
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return true;
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}
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constexpr bool testConstexprMonths(std::chrono::year_month ym)
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{
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std::chrono::months offset{6};
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if (static_cast<unsigned>((ym ).month()) != 1) return false;
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if (static_cast<unsigned>((ym + offset).month()) != 7) return false;
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if (static_cast<unsigned>((offset + ym).month()) != 7) return false;
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return true;
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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 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_NOEXCEPT(std::declval<years>() + std::declval<year_month>());
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ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<years>()));
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ASSERT_SAME_TYPE(year_month, decltype(std::declval<years>() + std::declval<year_month>()));
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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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year_month ym2 = years{i} + ym;
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assert(static_cast<int>(ym1.year()) == i + 1234);
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assert(static_cast<int>(ym2.year()) == i + 1234);
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assert(ym1.month() == std::chrono::January);
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assert(ym2.month() == std::chrono::January);
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assert(ym1 == ym2);
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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_NOEXCEPT(std::declval<months>() + std::declval<year_month>());
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ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<months>()));
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ASSERT_SAME_TYPE(year_month, decltype(std::declval<months>() + std::declval<year_month>()));
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static_assert(testConstexprMonths(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) // TODO test wrap-around
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{
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year_month ym1 = ym + months{i};
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year_month ym2 = months{i} + ym;
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assert(static_cast<int>(ym1.year()) == 1234);
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assert(static_cast<int>(ym2.year()) == 1234);
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assert(ym1.month() == month(1 + i));
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assert(ym2.month() == month(1 + i));
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assert(ym1 == ym2);
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}
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}
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return 0;
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}
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