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
|
//===----------------------------------------------------------------------===//
//
// 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
// template <class U>
// reverse_iterator& operator=(const reverse_iterator<U>& u); // constexpr since C++17
#include <iterator>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
template <class It, class U>
TEST_CONSTEXPR_CXX17 void test(U u) {
const std::reverse_iterator<U> r2(u);
std::reverse_iterator<It> r1;
std::reverse_iterator<It>& rr = r1 = r2;
assert(base(r1.base()) == base(u));
assert(&rr == &r1);
}
struct Base { };
struct Derived : Base { };
struct ToIter {
typedef std::bidirectional_iterator_tag iterator_category;
typedef char *pointer;
typedef char &reference;
typedef char value_type;
typedef value_type difference_type;
explicit TEST_CONSTEXPR_CXX17 ToIter() : m_value(0) {}
TEST_CONSTEXPR_CXX17 ToIter(const ToIter &src) : m_value(src.m_value) {}
// Intentionally not defined, must not be called.
ToIter(char *src);
TEST_CONSTEXPR_CXX17 ToIter &operator=(char *src) {
m_value = src;
return *this;
}
TEST_CONSTEXPR_CXX17 ToIter &operator=(const ToIter &src) {
m_value = src.m_value;
return *this;
}
char *m_value;
reference operator*() const;
};
TEST_CONSTEXPR_CXX17 bool tests() {
Derived d;
test<bidirectional_iterator<Base*> >(bidirectional_iterator<Derived*>(&d));
test<random_access_iterator<const Base*> >(random_access_iterator<Derived*>(&d));
test<Base*>(&d);
char c = '\0';
char *fi = &c;
const std::reverse_iterator<char *> rev_fi(fi);
std::reverse_iterator<ToIter> rev_ti;
rev_ti = rev_fi;
assert(rev_ti.base().m_value == fi);
return true;
}
int main(int, char**) {
tests();
#if TEST_STD_VER > 14
static_assert(tests(), "");
#endif
return 0;
}
|
