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<ForwardIterator Iter, Predicate<auto, Iter::value_type> Pred, class T>
12// requires OutputIterator<Iter, Iter::reference>
13// && OutputIterator<Iter, const T&>
14// && CopyConstructible<Pred>
15// constexpr void // constexpr after C++17
16// replace_if(Iter first, Iter last, Pred pred, const T& new_value);
17
18#include <algorithm>
19#include <functional>
20#include <cassert>
21
22#include "test_macros.h"
23#include "test_iterators.h"
24
25TEST_CONSTEXPR bool equalToTwo(int v) { return v == 2; }
26
27#if TEST_STD_VER > 17
28TEST_CONSTEXPR bool test_constexpr() {
29 int ia[] = {0, 1, 2, 3, 4};
30 const int expected[] = {0, 1, 5, 3, 4};
31
32 std::replace_if(std::begin(ia), std::end(ia), equalToTwo, 5);
33 return std::equal(std::begin(ia), std::end(ia), std::begin(expected), std::end(expected))
34 ;
35 }
36#endif
37
38
39template <class Iter>
40void
41test()
42{
43 int ia[] = {0, 1, 2, 3, 4};
44 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
45 std::replace_if(Iter(ia), Iter(ia+sa), equalToTwo, 5);
46 assert(ia[0] == 0);
47 assert(ia[1] == 1);
48 assert(ia[2] == 5);
49 assert(ia[3] == 3);
50 assert(ia[4] == 4);
51}
52
53int main(int, char**)
54{
55 test<forward_iterator<int*> >();
56 test<bidirectional_iterator<int*> >();
57 test<random_access_iterator<int*> >();
58 test<int*>();
59
60#if TEST_STD_VER > 17
61 static_assert(test_constexpr());
62#endif
63
64 return 0;
65}
66

source code of libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp