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64 lines
1.9 KiB
C++
64 lines
1.9 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;
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// constexpr year operator-(const year& x, const years& y) noexcept;
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// Returns: x + -y.
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//
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// constexpr years operator-(const year& x, const year& y) noexcept;
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// Returns: If x.ok() == true and y.ok() == true, returns a value m in the range
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// [years{0}, years{11}] satisfying y + m == x.
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// Otherwise the value returned is unspecified.
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// [Example: January - February == years{11}. —end example]
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extern "C" int printf(const char *, ...);
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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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template <typename Y, typename Ys>
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constexpr bool testConstexpr()
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{
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Y y{2313};
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Ys offset{1006};
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if (y - offset != Y{1307}) return false;
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if (y - Y{1307} != offset) 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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ASSERT_NOEXCEPT( std::declval<year>() - std::declval<years>());
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ASSERT_SAME_TYPE(year , decltype(std::declval<year>() - std::declval<years>()));
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ASSERT_NOEXCEPT( std::declval<year>() - std::declval<year>());
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ASSERT_SAME_TYPE(years, decltype(std::declval<year>() - std::declval<year>()));
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static_assert(testConstexpr<year, years>(), "");
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year y{1223};
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for (int i = 1100; i <= 1110; ++i)
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{
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year y1 = y - years{i};
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years ys1 = y - year{i};
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assert(static_cast<int>(y1) == 1223 - i);
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assert(ys1.count() == 1223 - i);
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}
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return 0;
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}
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