1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <algorithm>
10 
11 // template<InputIterator InIter, typename OutIter,
12 //          Predicate<auto, InIter::value_type> Pred, class T>
13 //   requires OutputIterator<OutIter, InIter::reference>
14 //         && OutputIterator<OutIter, const T&>
15 //         && CopyConstructible<Pred>
16 //   constexpr OutIter      // constexpr after C++17
17 //   replace_copy_if(InIter first, InIter last, OutIter result, Pred pred, const T& new_value);
18 
19 #include <algorithm>
20 #include <functional>
21 #include <cassert>
22 
23 #include "test_macros.h"
24 #include "test_iterators.h"
25 
26 TEST_CONSTEXPR bool equalToTwo(int v) { return v == 2; }
27 
28 
29 #if TEST_STD_VER > 17
30 TEST_CONSTEXPR bool test_constexpr() {
31     int ia[] = {0, 1, 2, 3, 4};
32     int ib[] = {0, 0, 0, 0, 0, 0}; // one bigger
33     const int expected[] = {0, 1, 5, 3, 4};
34 
35     auto it = std::replace_copy_if(std::begin(ia), std::end(ia), std::begin(ib), equalToTwo, 5);
36 
37     return it == (std::begin(ib) + std::size(ia))
38         && *it == 0 // don't overwrite the last value in the output array
39         && std::equal(std::begin(ib), it, std::begin(expected), std::end(expected))
40         ;
41     }
42 #endif
43 
44 template <class InIter, class OutIter>
45 void
46 test()
47 {
48     int ia[] = {0, 1, 2, 3, 4};
49     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
50     int ib[sa] = {0};
51     OutIter r = std::replace_copy_if(InIter(ia), InIter(ia+sa),
52                                      OutIter(ib), equalToTwo, 5);
53     assert(base(r) == ib + sa);
54     assert(ib[0] == 0);
55     assert(ib[1] == 1);
56     assert(ib[2] == 5);
57     assert(ib[3] == 3);
58     assert(ib[4] == 4);
59 }
60 
61 int main(int, char**)
62 {
63     test<cpp17_input_iterator<const int*>, output_iterator<int*> >();
64     test<cpp17_input_iterator<const int*>, forward_iterator<int*> >();
65     test<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >();
66     test<cpp17_input_iterator<const int*>, random_access_iterator<int*> >();
67     test<cpp17_input_iterator<const int*>, int*>();
68 
69     test<forward_iterator<const int*>, output_iterator<int*> >();
70     test<forward_iterator<const int*>, forward_iterator<int*> >();
71     test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
72     test<forward_iterator<const int*>, random_access_iterator<int*> >();
73     test<forward_iterator<const int*>, int*>();
74 
75     test<bidirectional_iterator<const int*>, output_iterator<int*> >();
76     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
77     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
78     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
79     test<bidirectional_iterator<const int*>, int*>();
80 
81     test<random_access_iterator<const int*>, output_iterator<int*> >();
82     test<random_access_iterator<const int*>, forward_iterator<int*> >();
83     test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
84     test<random_access_iterator<const int*>, random_access_iterator<int*> >();
85     test<random_access_iterator<const int*>, int*>();
86 
87     test<const int*, output_iterator<int*> >();
88     test<const int*, forward_iterator<int*> >();
89     test<const int*, bidirectional_iterator<int*> >();
90     test<const int*, random_access_iterator<int*> >();
91     test<const int*, int*>();
92 
93 #if TEST_STD_VER > 17
94     static_assert(test_constexpr());
95 #endif
96 
97   return 0;
98 }
99