equal.pass.cpp revision 01afa5c6e407e985d9643707d7b7ab1384bd9317 
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 <optional>
16
17int main()
18{
19#if _LIBCPP_STD_VER > 11
20    {
21    typedef int T;
22    typedef std::optional<T> O;
23
24    constexpr T val(2);
25    constexpr O o1;     // disengaged
26    constexpr O o2{1};  // engaged
27    constexpr O o3{val};  // engaged
28
29    static_assert ( !(o1 == 1), "" );
30    static_assert (   o2 == 1,  "" );
31    static_assert ( !(o3 == 1), "" );
32    static_assert (   o3 == 2 , "" );
33    static_assert (   o3 == val, "" );
34
35    static_assert ( !(1 == o1), "" );
36    static_assert (   1 == o2,  "" );
37    static_assert ( !(1 == o3), "" );
38    static_assert (   2 == o3 , "" );
39    static_assert ( val == o3 , "" );
40    }
41#endif
42}
43