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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
// template <class T> constexpr bool operator==(const optional<T>& x, const optional<T>& y);
#include <optional>
#include <type_traits>
#include <cassert>
using std::optional;
struct X
{
int i_;
constexpr X(int i) : i_(i) {}
};
constexpr bool operator == ( const X &lhs, const X &rhs )
{ return lhs.i_ == rhs.i_ ; }
int main()
{
{
typedef X T;
typedef optional<T> O;
constexpr O o1; // disengaged
constexpr O o2; // disengaged
constexpr O o3{1}; // engaged
constexpr O o4{2}; // engaged
constexpr O o5{1}; // engaged
static_assert ( o1 == o1 , "" );
static_assert ( o1 == o2 , "" );
static_assert ( !(o1 == o3), "" );
static_assert ( !(o1 == o4), "" );
static_assert ( !(o1 == o5), "" );
static_assert ( o2 == o1 , "" );
static_assert ( o2 == o2 , "" );
static_assert ( !(o2 == o3), "" );
static_assert ( !(o2 == o4), "" );
static_assert ( !(o2 == o5), "" );
static_assert ( !(o3 == o1), "" );
static_assert ( !(o3 == o2), "" );
static_assert ( o3 == o3 , "" );
static_assert ( !(o3 == o4), "" );
static_assert ( o3 == o5 , "" );
static_assert ( !(o4 == o1), "" );
static_assert ( !(o4 == o2), "" );
static_assert ( !(o4 == o3), "" );
static_assert ( o4 == o4 , "" );
static_assert ( !(o4 == o5), "" );
static_assert ( !(o5 == o1), "" );
static_assert ( !(o5 == o2), "" );
static_assert ( o5 == o3 , "" );
static_assert ( !(o5 == o4), "" );
static_assert ( o5 == o5 , "" );
}
}
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