1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <optional>
11
12 // template <class T> constexpr bool operator!=(const optional<T>& x, const T& v);
13 // template <class T> constexpr bool operator!=(const T& v, const optional<T>& x);
14
15 #include <experimental/optional>
16
17 #if _LIBCPP_STD_VER > 11
18
19 using std::experimental::optional;
20
21 struct X
22 {
23 int i_;
24
XX25 constexpr X(int i) : i_(i) {}
26 };
27
operator ==(const X & lhs,const X & rhs)28 constexpr bool operator == ( const X &lhs, const X &rhs )
29 { return lhs.i_ == rhs.i_ ; }
30
31 #endif
32
main()33 int main()
34 {
35 #if _LIBCPP_STD_VER > 11
36 {
37 typedef X T;
38 typedef optional<T> O;
39
40 constexpr T val(2);
41 constexpr O o1; // disengaged
42 constexpr O o2{1}; // engaged
43 constexpr O o3{val}; // engaged
44
45 static_assert ( (o1 != T(1)), "" );
46 static_assert ( !(o2 != T(1)), "" );
47 static_assert ( (o3 != T(1)), "" );
48 static_assert ( !(o3 != T(2)), "" );
49 static_assert ( !(o3 != val), "" );
50
51 static_assert ( (T(1) != o1), "" );
52 static_assert ( !(T(1) != o2), "" );
53 static_assert ( (T(1) != o3), "" );
54 static_assert ( !(T(2) != o3), "" );
55 static_assert ( !(val != o3), "" );
56 }
57 #endif
58 }
59