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
|
//===----------------------------------------------------------------------===//
//
// 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> constexpr bool operator> (const optional<T>& x, const optional<T>& 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), "" );
}
}
|
