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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>
#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 optional<X> 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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