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 // UNSUPPORTED: c++03, c++11, c++14
10
11 // UNSUPPORTED: libcpp-has-no-incomplete-pstl
12
13 // <algorithm>
14
15 // template<class ExecutionPolicy, class ForwardIterator, class Predicate>
16 // ForwardIterator find_if(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last,
17 // Predicate pred);
18
19 #include <algorithm>
20 #include <cassert>
21 #include <vector>
22
23 #include "test_macros.h"
24 #include "test_execution_policies.h"
25 #include "test_iterators.h"
26
27 EXECUTION_POLICY_SFINAE_TEST(find_if);
28
29 static_assert(sfinae_test_find_if<int, int*, int*, bool (*)(int)>);
30 static_assert(!sfinae_test_find_if<std::execution::parallel_policy, int*, int*, int>);
31
32 template <class Iter>
33 struct Test {
34 template <class Policy>
operator ()Test35 void operator()(Policy&& policy) {
36 int a[] = {1, 2, 3, 4, 5, 6, 7, 8};
37
38 // simple test
39 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::end(a)), [](int i) { return i == 3; })) == a + 2);
40
41 // check that last is returned if no element matches
42 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::end(a)), [](int i) { return i == 0; })) ==
43 std::end(a));
44
45 // check that the first element is returned
46 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::end(a)), [](int i) { return i == 1; })) ==
47 std::begin(a));
48
49 // check that an empty range works
50 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::begin(a)), [](int i) { return i == 1; })) ==
51 std::begin(a));
52
53 // check that a one-element range works
54 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::begin(a) + 1), [](int i) { return i == 1; })) ==
55 std::begin(a));
56
57 // check that a two-element range works
58 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::begin(a) + 2), [](int i) { return i == 2; })) ==
59 std::begin(a) + 1);
60
61 // check that a large number of elements works
62 std::vector<int> vec(200, 4);
63 vec[176] = 5;
64 assert(base(std::find_if(policy, Iter(std::data(vec)), Iter(std::data(vec) + std::size(vec)), [](int i) {
65 return i == 5;
66 })) == std::data(vec) + 176);
67 }
68 };
69
main(int,char **)70 int main(int, char**) {
71 types::for_each(types::forward_iterator_list<int*>{}, TestIteratorWithPolicies<Test>{});
72
73 return 0;
74 }
75