copy_backward.pass.cpp
2.02 KB
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
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<BidirectionalIterator InIter, BidirectionalIterator OutIter>
// requires OutputIterator<OutIter, InIter::reference>
// constexpr OutIter // constexpr after C++17
// copy_backward(InIter first, InIter last, OutIter result);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "user_defined_integral.h"
template <class InIter, class OutIter>
TEST_CONSTEXPR_CXX20 void
test_copy_backward()
{
const unsigned N = 1000;
int ia[N] = {};
for (unsigned i = 0; i < N; ++i)
ia[i] = i;
int ib[N] = {0};
OutIter r = std::copy_backward(InIter(ia), InIter(ia+N), OutIter(ib+N));
assert(base(r) == ib);
for (unsigned i = 0; i < N; ++i)
assert(ia[i] == ib[i]);
}
TEST_CONSTEXPR_CXX20 bool
test()
{
test_copy_backward<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
test_copy_backward<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
test_copy_backward<bidirectional_iterator<const int*>, int*>();
test_copy_backward<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
test_copy_backward<random_access_iterator<const int*>, random_access_iterator<int*> >();
test_copy_backward<random_access_iterator<const int*>, int*>();
test_copy_backward<const int*, bidirectional_iterator<int*> >();
test_copy_backward<const int*, random_access_iterator<int*> >();
test_copy_backward<const int*, int*>();
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED)
static_assert(test());
#endif
return 0;
}