xref: /minix3/external/bsd/libc++/dist/libcxx/test/utilities/optional/optional.comp_with_t/equal.pass.cpp (revision 4684ddb6aab0b36791c8099bc705d6140b3d05d0)
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