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54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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 month;
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// constexpr month& operator--() noexcept;
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// constexpr month 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 M>
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constexpr bool testConstexpr()
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{
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M m1{10};
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if (static_cast<unsigned>(--m1) != 9) return false;
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if (static_cast<unsigned>(m1--) != 9) return false;
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if (static_cast<unsigned>(m1) != 8) return false;
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return true;
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}
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int main()
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{
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using month = std::chrono::month;
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ASSERT_NOEXCEPT(--(std::declval<month&>()) );
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ASSERT_NOEXCEPT( (std::declval<month&>())--);
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ASSERT_SAME_TYPE(month , decltype( std::declval<month&>()--));
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ASSERT_SAME_TYPE(month&, decltype(--std::declval<month&>() ));
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static_assert(testConstexpr<month>(), "");
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for (unsigned i = 10; i <= 20; ++i)
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{
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month month(i);
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assert(static_cast<unsigned>(--month) == i - 1);
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assert(static_cast<unsigned>(month--) == i - 1);
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assert(static_cast<unsigned>(month) == i - 2);
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}
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}
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