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, c++14
11 // <optional>
12
13 // template <class T> constexpr bool operator==(const optional<T>& x, const optional<T>& y);
14
15 #include <optional>
16 #include <type_traits>
17 #include <cassert>
18
19 using std::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