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 // UNSUPPORTED: c++98, c++03, c++11, c++14
11 // <optional>
12
13 // template <class T, class U> constexpr bool operator>=(const optional<T>& x, const U& v);
14 // template <class T, class U> constexpr bool operator>=(const U& v, const optional<T>& x);
15
16 #include <optional>
17
18 using std::optional;
19
20 struct X {
21 int i_;
22
XX23 constexpr X(int i) : i_(i) {}
24 };
25
operator >=(const X & lhs,const X & rhs)26 constexpr bool operator>=(const X& lhs, const X& rhs) {
27 return lhs.i_ >= rhs.i_;
28 }
29
main()30 int main() {
31 {
32 typedef X T;
33 typedef optional<T> O;
34
35 constexpr T val(2);
36 constexpr O o1; // disengaged
37 constexpr O o2{1}; // engaged
38 constexpr O o3{val}; // engaged
39
40 static_assert(!(o1 >= T(1)), "");
41 static_assert((o2 >= T(1)), ""); // equal
42 static_assert((o3 >= T(1)), "");
43 static_assert(!(o2 >= val), "");
44 static_assert((o3 >= val), ""); // equal
45 static_assert(!(o3 >= T(3)), "");
46
47 static_assert((T(1) >= o1), "");
48 static_assert((T(1) >= o2), ""); // equal
49 static_assert(!(T(1) >= o3), "");
50 static_assert((val >= o2), "");
51 static_assert((val >= o3), ""); // equal
52 static_assert((T(3) >= o3), "");
53 }
54 {
55 using O = optional<int>;
56 constexpr O o1(42);
57 static_assert(o1 >= 42l, "");
58 static_assert(!(11l >= o1), "");
59 }
60 {
61 using O = optional<const int>;
62 constexpr O o1(42);
63 static_assert(o1 >= 42, "");
64 static_assert(!(11 >= o1), "");
65 }
66 }
67