1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <algorithm>
11
12// template<BidirectionalIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
13//   constexpr OutIter          // constexpr after C++17
14//   reverse_copy(InIter first, InIter last, OutIter result);
15
16#include <algorithm>
17#include <cassert>
18
19#include "test_macros.h"
20#include "test_iterators.h"
21
22#if TEST_STD_VER > 17
23TEST_CONSTEXPR bool test_constexpr() {
24    int ia[] = {1, 3, 5, 2, 5, 6};
25    int ib[std::size(ia)] = {0};
26
27    auto it = std::reverse_copy(std::begin(ia), std::end(ia), std::begin(ib));
28
29    return std::distance(std::begin(ib), it) == std::size(ia)
30        && std::equal   (std::begin(ia), std::end(ia), std::rbegin(ib))
31           ;
32    }
33#endif
34
35template <class InIter, class OutIter>
36void
37test()
38{
39    const int ia[] = {0};
40    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
41    int ja[sa] = {-1};
42    OutIter r = std::reverse_copy(InIter(ia), InIter(ia), OutIter(ja));
43    assert(base(r) == ja);
44    assert(ja[0] == -1);
45    r = std::reverse_copy(InIter(ia), InIter(ia+sa), OutIter(ja));
46    assert(ja[0] == 0);
47
48    const int ib[] = {0, 1};
49    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
50    int jb[sb] = {-1};
51    r = std::reverse_copy(InIter(ib), InIter(ib+sb), OutIter(jb));
52    assert(base(r) == jb+sb);
53    assert(jb[0] == 1);
54    assert(jb[1] == 0);
55
56    const int ic[] = {0, 1, 2};
57    const unsigned sc = sizeof(ic)/sizeof(ic[0]);
58    int jc[sc] = {-1};
59    r = std::reverse_copy(InIter(ic), InIter(ic+sc), OutIter(jc));
60    assert(base(r) == jc+sc);
61    assert(jc[0] == 2);
62    assert(jc[1] == 1);
63    assert(jc[2] == 0);
64
65    int id[] = {0, 1, 2, 3};
66    const unsigned sd = sizeof(id)/sizeof(id[0]);
67    int jd[sd] = {-1};
68    r = std::reverse_copy(InIter(id), InIter(id+sd), OutIter(jd));
69    assert(base(r) == jd+sd);
70    assert(jd[0] == 3);
71    assert(jd[1] == 2);
72    assert(jd[2] == 1);
73    assert(jd[3] == 0);
74}
75
76int main()
77{
78    test<bidirectional_iterator<const int*>, output_iterator<int*> >();
79    test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
80    test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
81    test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
82    test<bidirectional_iterator<const int*>, int*>();
83
84    test<random_access_iterator<const int*>, output_iterator<int*> >();
85    test<random_access_iterator<const int*>, forward_iterator<int*> >();
86    test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
87    test<random_access_iterator<const int*>, random_access_iterator<int*> >();
88    test<random_access_iterator<const int*>, int*>();
89
90    test<const int*, output_iterator<int*> >();
91    test<const int*, forward_iterator<int*> >();
92    test<const int*, bidirectional_iterator<int*> >();
93    test<const int*, random_access_iterator<int*> >();
94    test<const int*, int*>();
95
96#if TEST_STD_VER > 17
97    static_assert(test_constexpr());
98#endif
99}
100