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
|
//===----------------------------------------------------------------------===//
//
// 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>
// reverse_iterator
// pointer operator->() const; // constexpr in C++17
// Be sure to respect LWG 198:
// http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#198
// LWG 198 was superseded by LWG 2360
// http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2360
#include <iterator>
#include <list>
#include <cassert>
#include "test_macros.h"
class A
{
int data_;
public:
A() : data_(1) {}
~A() {data_ = -1;}
int get() const {return data_;}
friend bool operator==(const A& x, const A& y)
{return x.data_ == y.data_;}
};
template <class It>
void
test(It i, typename std::iterator_traits<It>::value_type x)
{
std::reverse_iterator<It> r(i);
assert(r->get() == x.get());
}
class B
{
int data_;
public:
B(int d=1) : data_(d) {}
~B() {data_ = -1;}
int get() const {return data_;}
friend bool operator==(const B& x, const B& y)
{return x.data_ == y.data_;}
const B *operator&() const { return nullptr; }
B *operator&() { return nullptr; }
};
class C
{
int data_;
public:
TEST_CONSTEXPR C() : data_(1) {}
TEST_CONSTEXPR int get() const {return data_;}
friend TEST_CONSTEXPR bool operator==(const C& x, const C& y)
{return x.data_ == y.data_;}
};
TEST_CONSTEXPR C gC;
int main(int, char**)
{
A a;
test(&a+1, A());
{
std::list<B> l;
l.push_back(B(0));
l.push_back(B(1));
l.push_back(B(2));
{
std::list<B>::const_iterator i = l.begin();
assert ( i->get() == 0 ); ++i;
assert ( i->get() == 1 ); ++i;
assert ( i->get() == 2 ); ++i;
assert ( i == l.end ());
}
{
std::list<B>::const_reverse_iterator ri = l.rbegin();
assert ( ri->get() == 2 ); ++ri;
assert ( ri->get() == 1 ); ++ri;
assert ( ri->get() == 0 ); ++ri;
assert ( ri == l.rend ());
}
}
#if TEST_STD_VER > 14
{
typedef std::reverse_iterator<const C *> RI;
constexpr RI it1 = std::make_reverse_iterator(&gC+1);
static_assert(it1->get() == gC.get(), "");
}
#endif
{
((void)gC);
}
return 0;
}
|
