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60 lines
1.6 KiB
C++
60 lines
1.6 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 day;
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// constexpr day operator-(const day& x, const days& y) noexcept;
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// Returns: x + -y.
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//
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// constexpr days operator-(const day& x, const day& y) noexcept;
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// Returns: days{int(unsigned{x}) - int(unsigned{y}).
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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 D, typename Ds>
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constexpr bool testConstexpr()
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{
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D d{23};
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Ds offset{6};
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if (d - offset != D{17}) return false;
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if (d - D{17} != 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 day = std::chrono::day;
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using days = std::chrono::days;
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ASSERT_NOEXCEPT(std::declval<day>() - std::declval<days>());
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ASSERT_NOEXCEPT(std::declval<day>() - std::declval<day>());
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ASSERT_SAME_TYPE(day, decltype(std::declval<day>() - std::declval<days>()));
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ASSERT_SAME_TYPE(days, decltype(std::declval<day>() - std::declval<day>()));
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static_assert(testConstexpr<day, days>(), "");
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day dy{12};
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for (unsigned i = 0; i <= 10; ++i)
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{
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day d1 = dy - days{i};
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days off = dy - day {i};
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assert(static_cast<unsigned>(d1) == 12 - i);
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assert(off.count() == static_cast<int>(12 - i)); // days is signed
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}
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return 0;
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}
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