01afa5c6e4
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189772 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.2 KiB
C++
43 lines
1.2 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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// <optional>
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// template <class T> constexpr bool operator==(const optional<T>& x, const T& v);
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// template <class T> constexpr bool operator==(const T& v, const optional<T>& x);
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#include <optional>
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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{
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typedef int T;
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typedef std::optional<T> O;
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constexpr T val(2);
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constexpr O o1; // disengaged
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constexpr O o2{1}; // engaged
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constexpr O o3{val}; // engaged
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static_assert ( !(o1 == 1), "" );
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static_assert ( o2 == 1, "" );
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static_assert ( !(o3 == 1), "" );
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static_assert ( o3 == 2 , "" );
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static_assert ( o3 == val, "" );
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static_assert ( !(1 == o1), "" );
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static_assert ( 1 == o2, "" );
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static_assert ( !(1 == o3), "" );
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static_assert ( 2 == o3 , "" );
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static_assert ( val == o3 , "" );
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}
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#endif
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}
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