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, OutputIterator<auto, InIter::reference> OutIter,
12// Predicate<auto, InIter::value_type> Pred>
13// requires CopyConstructible<Pred>
14// constexpr OutIter // constexpr after C++17
15// remove_copy_if(InIter first, InIter last, OutIter result, Pred pred);
16
17#include <algorithm>
18#include <functional>
19#include <cassert>
20
21#include "test_macros.h"
22#include "test_iterators.h"
23
24TEST_CONSTEXPR bool equalToTwo(int v) { return v == 2; }
25
26#if TEST_STD_VER > 17
27TEST_CONSTEXPR bool test_constexpr() {
28 int ia[] = {1, 3, 5, 2, 5, 6};
29 int ib[std::size(ia)] = {0};
30
31 auto it = std::remove_copy_if(std::begin(ia), std::end(ia), std::begin(ib), equalToTwo);
32
33 return std::distance(std::begin(ib), it) == static_cast<int>(std::size(ia) - 1) // we removed one element
34 && std::none_of(std::begin(ib), it, equalToTwo)
35 && std::all_of (it, std::end(ib), [](int a) {return a == 0;})
36 ;
37 }
38#endif
39
40template <class InIter, class OutIter>
41void
42test()
43{
44 int ia[] = {0, 1, 2, 3, 4, 2, 3, 4, 2};
45 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
46 int ib[sa];
47 OutIter r = std::remove_copy_if(InIter(ia), InIter(ia+sa),
48 OutIter(ib), equalToTwo);
49 assert(base(r) == ib + sa-3);
50 assert(ib[0] == 0);
51 assert(ib[1] == 1);
52 assert(ib[2] == 3);
53 assert(ib[3] == 4);
54 assert(ib[4] == 3);
55 assert(ib[5] == 4);
56}
57
58int main(int, char**)
59{
60 test<cpp17_input_iterator<const int*>, cpp17_output_iterator<int*> >();
61 test<cpp17_input_iterator<const int*>, forward_iterator<int*> >();
62 test<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >();
63 test<cpp17_input_iterator<const int*>, random_access_iterator<int*> >();
64 test<cpp17_input_iterator<const int*>, int*>();
65
66 test<forward_iterator<const int*>, cpp17_output_iterator<int*> >();
67 test<forward_iterator<const int*>, forward_iterator<int*> >();
68 test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
69 test<forward_iterator<const int*>, random_access_iterator<int*> >();
70 test<forward_iterator<const int*>, int*>();
71
72 test<bidirectional_iterator<const int*>, cpp17_output_iterator<int*> >();
73 test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
74 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
75 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
76 test<bidirectional_iterator<const int*>, int*>();
77
78 test<random_access_iterator<const int*>, cpp17_output_iterator<int*> >();
79 test<random_access_iterator<const int*>, forward_iterator<int*> >();
80 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
81 test<random_access_iterator<const int*>, random_access_iterator<int*> >();
82 test<random_access_iterator<const int*>, int*>();
83
84 test<const int*, cpp17_output_iterator<int*> >();
85 test<const int*, forward_iterator<int*> >();
86 test<const int*, bidirectional_iterator<int*> >();
87 test<const int*, random_access_iterator<int*> >();
88 test<const int*, int*>();
89
90#if TEST_STD_VER > 17
91 static_assert(test_constexpr());
92#endif
93
94 return 0;
95}
96

source code of libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy_if.pass.cpp