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54 lines
1.4 KiB
C++
54 lines
1.4 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--() noexcept;
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// constexpr day operator--(int) noexcept;
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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>
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constexpr bool testConstexpr()
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{
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D d1{10};
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if (static_cast<unsigned>(--d1) != 9) return false;
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if (static_cast<unsigned>(d1--) != 9) return false;
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if (static_cast<unsigned>(d1) != 8) 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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ASSERT_NOEXCEPT(--(std::declval<day&>()) );
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ASSERT_NOEXCEPT( (std::declval<day&>())--);
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ASSERT_SAME_TYPE(day , decltype( std::declval<day&>()--));
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ASSERT_SAME_TYPE(day&, decltype(--std::declval<day&>() ));
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static_assert(testConstexpr<day>(), "");
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for (unsigned i = 10; i <= 20; ++i)
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{
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day day(i);
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assert(static_cast<unsigned>(--day) == i - 1);
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assert(static_cast<unsigned>(day--) == i - 1);
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assert(static_cast<unsigned>(day) == i - 2);
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}
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return 0;
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}
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