eqaul.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
11// <optional>
12
13// template <class T> constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept;
14// template <class T> constexpr bool operator==(nullopt_t, const optional<T>& x) noexcept;
15
16#include <optional>
17
18int main()
19{
20#if _LIBCPP_STD_VER > 11
21    {
22    typedef int T;
23    typedef std::optional<T> O;
24
25    constexpr O o1;     // disengaged
26    constexpr O o2{1};  // engaged
27
28    static_assert (   std::nullopt == o1 , "" );
29    static_assert ( !(std::nullopt == o2), "" );
30    static_assert (   o1 == std::nullopt , "" );
31    static_assert ( !(o2 == std::nullopt), "" );
32
33    static_assert (noexcept(std::nullopt == o1), "");
34    static_assert (noexcept(o1 == std::nullopt), "");
35    }
36#endif
37}
38