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
19using std::experimental::optional;
20
21struct X
22{
23    int i_;
24
25    constexpr X(int i) : i_(i) {}
26};
27
28constexpr bool operator < ( const X &lhs, const X &rhs )
29    { return lhs.i_ < rhs.i_ ; }
30
31#endif
32
33int main()
34{
35#if _LIBCPP_STD_VER > 11
36
37    {
38    typedef X T;
39    typedef optional<T> O;
40
41    constexpr T val(2);
42    constexpr O o1;       // disengaged
43    constexpr O o2{1};    // engaged
44    constexpr O o3{val};  // engaged
45
46    static_assert ( !(o1 >= T(1)), "" );
47    static_assert (  (o2 >= T(1)), "" );  // equal
48    static_assert (  (o3 >= T(1)), "" );
49    static_assert ( !(o2 >=  val), "" );
50    static_assert (  (o3 >=  val), "" );  // equal
51    static_assert ( !(o3 >= T(3)), "" );
52
53    static_assert (   (T(1) >= o1), "" );
54    static_assert (   (T(1) >= o2), "" ); // equal
55    static_assert (  !(T(1) >= o3), "" );
56    static_assert (   (val  >= o2), "" );
57    static_assert (   (val  >= o3), "" ); // equal
58    static_assert (   (T(3) >= o3), "" );
59    }
60#endif
61}
62