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 // UNSUPPORTED: c++98, c++03, c++11
11 // <optional>
12
13 // template <class T> constexpr bool operator!=(const optional<T>& x, const optional<T>& y);
14
15 #include <experimental/optional>
16 #include <type_traits>
17 #include <cassert>
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
main()31 int main()
32 {
33 {
34 typedef X T;
35 typedef optional<T> O;
36
37 constexpr O o1; // disengaged
38 constexpr O o2; // disengaged
39 constexpr O o3{1}; // engaged
40 constexpr O o4{2}; // engaged
41 constexpr O o5{1}; // engaged
42
43 static_assert ( !(o1 != o1), "" );
44 static_assert ( !(o1 != o2), "" );
45 static_assert ( (o1 != o3), "" );
46 static_assert ( (o1 != o4), "" );
47 static_assert ( (o1 != o5), "" );
48
49 static_assert ( !(o2 != o1), "" );
50 static_assert ( !(o2 != o2), "" );
51 static_assert ( (o2 != o3), "" );
52 static_assert ( (o2 != o4), "" );
53 static_assert ( (o2 != o5), "" );
54
55 static_assert ( (o3 != o1), "" );
56 static_assert ( (o3 != o2), "" );
57 static_assert ( !(o3 != o3), "" );
58 static_assert ( (o3 != o4), "" );
59 static_assert ( !(o3 != o5), "" );
60
61 static_assert ( (o4 != o1), "" );
62 static_assert ( (o4 != o2), "" );
63 static_assert ( (o4 != o3), "" );
64 static_assert ( !(o4 != o4), "" );
65 static_assert ( (o4 != o5), "" );
66
67 static_assert ( (o5 != o1), "" );
68 static_assert ( (o5 != o2), "" );
69 static_assert ( !(o5 != o3), "" );
70 static_assert ( (o5 != o4), "" );
71 static_assert ( !(o5 != o5), "" );
72
73 }
74 }
75