1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
// template <class T, class U> constexpr bool operator>= (const optional<T>& x, const optional<U>& y);
#include <optional>
using std::optional;
struct X {
int i_;
constexpr X(int i) : i_(i) {}
};
constexpr bool operator>=(const X& lhs, const X& rhs) {
return lhs.i_ >= rhs.i_;
}
int main() {
{
typedef optional<X> O;
constexpr O o1; // disengaged
constexpr O o2; // disengaged
constexpr O o3{1}; // engaged
constexpr O o4{2}; // engaged
constexpr O o5{1}; // engaged
static_assert((o1 >= o1), "");
static_assert((o1 >= o2), "");
static_assert(!(o1 >= o3), "");
static_assert(!(o1 >= o4), "");
static_assert(!(o1 >= o5), "");
static_assert((o2 >= o1), "");
static_assert((o2 >= o2), "");
static_assert(!(o2 >= o3), "");
static_assert(!(o2 >= o4), "");
static_assert(!(o2 >= o5), "");
static_assert((o3 >= o1), "");
static_assert((o3 >= o2), "");
static_assert((o3 >= o3), "");
static_assert(!(o3 >= o4), "");
static_assert((o3 >= o5), "");
static_assert((o4 >= o1), "");
static_assert((o4 >= o2), "");
static_assert((o4 >= o3), "");
static_assert((o4 >= o4), "");
static_assert((o4 >= o5), "");
static_assert((o5 >= o1), "");
static_assert((o5 >= o2), "");
static_assert((o5 >= o3), "");
static_assert(!(o5 >= o4), "");
static_assert((o5 >= o5), "");
}
{
using O1 = optional<int>;
using O2 = optional<long>;
constexpr O1 o1(42);
static_assert(o1 >= O2(42), "");
static_assert(!(O2(11) >= o1), "");
}
{
using O1 = optional<int>;
using O2 = optional<const int>;
constexpr O1 o1(42);
static_assert(o1 >= O2(42), "");
static_assert(!(O2(1) >= o1), "");
}
}
|
