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 optional<T>& y);
13
14 #include <experimental/optional>
15 #include <type_traits>
16 #include <cassert>
17
18 #if _LIBCPP_STD_VER > 11
19
20 using std::experimental::optional;
21
22 struct X
23 {
24 int i_;
25
XX26 constexpr X(int i) : i_(i) {}
27 };
28
operator ==(const X & lhs,const X & rhs)29 constexpr bool operator == ( const X &lhs, const X &rhs )
30 { return lhs.i_ == rhs.i_ ; }
31
32 #endif
33
main()34 int main()
35 {
36 #if _LIBCPP_STD_VER > 11
37 {
38 typedef X T;
39 typedef optional<T> O;
40
41 constexpr O o1; // disengaged
42 constexpr O o2; // disengaged
43 constexpr O o3{1}; // engaged
44 constexpr O o4{2}; // engaged
45 constexpr O o5{1}; // engaged
46
47 static_assert ( o1 == o1 , "" );
48 static_assert ( o1 == o2 , "" );
49 static_assert ( !(o1 == o3), "" );
50 static_assert ( !(o1 == o4), "" );
51 static_assert ( !(o1 == o5), "" );
52
53 static_assert ( o2 == o1 , "" );
54 static_assert ( o2 == o2 , "" );
55 static_assert ( !(o2 == o3), "" );
56 static_assert ( !(o2 == o4), "" );
57 static_assert ( !(o2 == o5), "" );
58
59 static_assert ( !(o3 == o1), "" );
60 static_assert ( !(o3 == o2), "" );
61 static_assert ( o3 == o3 , "" );
62 static_assert ( !(o3 == o4), "" );
63 static_assert ( o3 == o5 , "" );
64
65 static_assert ( !(o4 == o1), "" );
66 static_assert ( !(o4 == o2), "" );
67 static_assert ( !(o4 == o3), "" );
68 static_assert ( o4 == o4 , "" );
69 static_assert ( !(o4 == o5), "" );
70
71 static_assert ( !(o5 == o1), "" );
72 static_assert ( !(o5 == o2), "" );
73 static_assert ( o5 == o3 , "" );
74 static_assert ( !(o5 == o4), "" );
75 static_assert ( o5 == o5 , "" );
76
77 }
78 #endif
79 }
80