eqaul.pass.cpp revision 0cdbe6048173c1f05628dbc85430acf191a3e173 
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 <experimental/optional>
17
18int main()
19{
20#if _LIBCPP_STD_VER > 11
21	using std::experimental::optional;
22	using std::experimental::nullopt_t;
23	using std::experimental::nullopt;
24
25    {
26    typedef int T;
27    typedef optional<T> O;
28
29    constexpr O o1;     // disengaged
30    constexpr O o2{1};  // engaged
31
32    static_assert (   nullopt == o1 , "" );
33    static_assert ( !(nullopt == o2), "" );
34    static_assert (   o1 == nullopt , "" );
35    static_assert ( !(o2 == nullopt), "" );
36
37    static_assert (noexcept(nullopt == o1), "");
38    static_assert (noexcept(o1 == nullopt), "");
39    }
40#endif
41}
42