forked from OSchip/llvm-project
75 lines
2.0 KiB
C++
75 lines
2.0 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
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// <optional>
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// template <class T> constexpr bool operator==(const optional<T>& x, const optional<T>& y);
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#include <experimental/optional>
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#include <type_traits>
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#include <cassert>
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using std::experimental::optional;
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struct X
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{
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int i_;
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constexpr X(int i) : i_(i) {}
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};
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constexpr bool operator == ( const X &lhs, const X &rhs )
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{ return lhs.i_ == rhs.i_ ; }
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int main()
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{
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{
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typedef X T;
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typedef optional<T> O;
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constexpr O o1; // disengaged
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constexpr O o2; // disengaged
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constexpr O o3{1}; // engaged
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constexpr O o4{2}; // engaged
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constexpr O o5{1}; // engaged
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static_assert ( o1 == o1 , "" );
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static_assert ( o1 == o2 , "" );
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static_assert ( !(o1 == o3), "" );
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static_assert ( !(o1 == o4), "" );
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static_assert ( !(o1 == o5), "" );
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static_assert ( o2 == o1 , "" );
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static_assert ( o2 == o2 , "" );
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static_assert ( !(o2 == o3), "" );
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static_assert ( !(o2 == o4), "" );
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static_assert ( !(o2 == o5), "" );
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static_assert ( !(o3 == o1), "" );
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static_assert ( !(o3 == o2), "" );
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static_assert ( o3 == o3 , "" );
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static_assert ( !(o3 == o4), "" );
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static_assert ( o3 == o5 , "" );
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static_assert ( !(o4 == o1), "" );
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static_assert ( !(o4 == o2), "" );
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static_assert ( !(o4 == o3), "" );
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static_assert ( o4 == o4 , "" );
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static_assert ( !(o4 == o5), "" );
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static_assert ( !(o5 == o1), "" );
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static_assert ( !(o5 == o2), "" );
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static_assert ( o5 == o3 , "" );
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static_assert ( !(o5 == o4), "" );
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static_assert ( o5 == o5 , "" );
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}
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}
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