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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.
//
//===----------------------------------------------------------------------===//
// <optional>
// template <class T> constexpr bool operator!=(const optional<T>& x, const optional<T>& y);
#include <experimental/optional>
#include <type_traits>
#include <cassert>
#if _LIBCPP_STD_VER > 11
using std::experimental::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_ ; }
#endif
int main()
{
#if _LIBCPP_STD_VER > 11
{
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), "" );
}
#endif
}
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