forked from OSchip/llvm-project
59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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 T& v);
|
|
// template <class T> constexpr bool operator==(const T& v, const optional<T>& x);
|
|
|
|
#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 X T;
|
|
typedef optional<T> O;
|
|
|
|
constexpr T val(2);
|
|
constexpr O o1; // disengaged
|
|
constexpr O o2{1}; // engaged
|
|
constexpr O o3{val}; // engaged
|
|
|
|
static_assert ( !(o1 == T(1)), "" );
|
|
static_assert ( o2 == T(1), "" );
|
|
static_assert ( !(o3 == T(1)), "" );
|
|
static_assert ( o3 == T(2) , "" );
|
|
static_assert ( o3 == val, "" );
|
|
|
|
static_assert ( !(T(1) == o1), "" );
|
|
static_assert ( T(1) == o2, "" );
|
|
static_assert ( !(T(1) == o3), "" );
|
|
static_assert ( T(2) == o3 , "" );
|
|
static_assert ( val == o3 , "" );
|
|
}
|
|
#endif
|
|
}
|