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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <iterator>
// struct iterator_traits
// {
// };
#include <iterator>
#include <type_traits>
#include "test_macros.h"
template <class...>
using always_void = void;
#define HAS_XXX(member) \
template <class T, class = void> \
struct has_##member : std::false_type {}; \
template <class T> \
struct has_##member<T, always_void<typename T::member> > : std::true_type {}
HAS_XXX(difference_type);
HAS_XXX(value_type);
HAS_XXX(pointer);
HAS_XXX(reference);
HAS_XXX(iterator_category);
struct A {};
struct NotAnIteratorEmpty {};
struct NotAnIteratorNoDifference {
// typedef int difference_type;
typedef A value_type;
typedef A* pointer;
typedef A& reference;
typedef std::forward_iterator_tag iterator_category;
};
struct NotAnIteratorNoValue {
typedef int difference_type;
// typedef A value_type;
typedef A* pointer;
typedef A& reference;
typedef std::forward_iterator_tag iterator_category;
};
struct NotAnIteratorNoPointer {
typedef int difference_type;
typedef A value_type;
// typedef A* pointer;
typedef A& reference;
typedef std::forward_iterator_tag iterator_category;
};
struct NotAnIteratorNoReference {
typedef int difference_type;
typedef A value_type;
typedef A* pointer;
// typedef A& reference;
typedef std::forward_iterator_tag iterator_category;
};
struct NotAnIteratorNoCategory {
typedef int difference_type;
typedef A value_type;
typedef A* pointer;
typedef A& reference;
// typedef std::forward_iterator_tag iterator_category;
};
void test() {
{
typedef std::iterator_traits<NotAnIteratorEmpty> T;
static_assert(!has_difference_type<T>::value, "");
static_assert(!has_value_type<T>::value, "");
static_assert(!has_pointer<T>::value, "");
static_assert(!has_reference<T>::value, "");
static_assert(!has_iterator_category<T>::value, "");
}
{
typedef std::iterator_traits<NotAnIteratorNoDifference> T;
static_assert(!has_difference_type<T>::value, "");
static_assert(!has_value_type<T>::value, "");
static_assert(!has_pointer<T>::value, "");
static_assert(!has_reference<T>::value, "");
static_assert(!has_iterator_category<T>::value, "");
}
{
typedef std::iterator_traits<NotAnIteratorNoValue> T;
static_assert(!has_difference_type<T>::value, "");
static_assert(!has_value_type<T>::value, "");
static_assert(!has_pointer<T>::value, "");
static_assert(!has_reference<T>::value, "");
static_assert(!has_iterator_category<T>::value, "");
}
#if TEST_STD_VER <= 17 || !defined(__cpp_lib_concepts)
{
typedef std::iterator_traits<NotAnIteratorNoPointer> T;
static_assert(!has_difference_type<T>::value, "");
static_assert(!has_value_type<T>::value, "");
static_assert(!has_pointer<T>::value, "");
static_assert(!has_reference<T>::value, "");
static_assert(!has_iterator_category<T>::value, "");
}
#endif // TEST_STD_VER <= 17 || !defined(__cpp_lib_concepts)
{
typedef std::iterator_traits<NotAnIteratorNoReference> T;
static_assert(!has_difference_type<T>::value, "");
static_assert(!has_value_type<T>::value, "");
static_assert(!has_pointer<T>::value, "");
static_assert(!has_reference<T>::value, "");
static_assert(!has_iterator_category<T>::value, "");
}
{
typedef std::iterator_traits<NotAnIteratorNoCategory> T;
static_assert(!has_difference_type<T>::value, "");
static_assert(!has_value_type<T>::value, "");
static_assert(!has_pointer<T>::value, "");
static_assert(!has_reference<T>::value, "");
static_assert(!has_iterator_category<T>::value, "");
}
}
|
