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 // REQUIRES: with-pstl
12
13 // <algorithm>
14
15 // template<class ExecutionPolicy, class ForwardIterator1, class Size, class ForwardIterator2>
16 // ForwardIterator2 copy_n(ExecutionPolicy&& exec,
17 // ForwardIterator1 first, Size n,
18 // ForwardIterator2 result);
19
20 #include <algorithm>
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(copy_n);
28
29 static_assert(sfinae_test_copy_n<int, int*, int*, bool (*)(int)>);
30 static_assert(!sfinae_test_copy_n<std::execution::parallel_policy, int*, int*, int>);
31
32 template <class Iter1, class Iter2>
33 struct TestInt {
34 template <class Policy>
operator ()TestInt35 void operator()(Policy&& policy) {
36 // simple test
37 for (const int size : {0, 1, 2, 100, 350}) {
38 std::vector<int> a(size);
39 for (int i = 0; i != size; ++i)
40 a[i] = i + 1;
41
42 std::vector<int> out(std::size(a));
43 decltype(auto) ret = std::copy_n(policy, Iter1(std::data(a)), std::size(a), Iter2(std::data(out)));
44 static_assert(std::is_same_v<decltype(ret), Iter2>);
45 assert(base(ret) == std::data(out) + std::size(out));
46 for (int i = 0; i != size; ++i)
47 assert(out[i] == i + 1);
48 }
49 }
50 };
51
52 struct TestIteratorsInt {
53 template <class Iter2>
operator ()TestIteratorsInt54 void operator()() {
55 types::for_each(types::forward_iterator_list<int*>{},
56 TestIteratorWithPolicies<types::partial_instantiation<TestInt, Iter2>::template apply>{});
57 }
58 };
59
60 struct CopiedToTester {
61 bool copied_to = false;
62 CopiedToTester() = default;
CopiedToTesterCopiedToTester63 CopiedToTester(const CopiedToTester&) {}
operator =CopiedToTester64 CopiedToTester& operator=(const CopiedToTester&) {
65 assert(!copied_to);
66 copied_to = true;
67 return *this;
68 }
69 ~CopiedToTester() = default;
70 };
71
72 template <class Iter1, class Iter2>
73 struct TestNonTrivial {
74 template <class Policy>
operator ()TestNonTrivial75 void operator()(Policy&& policy) {
76 // simple test
77 for (const int size : {0, 1, 2, 100, 350}) {
78 std::vector<CopiedToTester> a(size);
79
80 std::vector<CopiedToTester> out(std::size(a));
81 auto ret = std::copy_n(policy, Iter1(std::data(a)), std::size(a), Iter2(std::data(out)));
82 assert(base(ret) == std::data(out) + std::size(out));
83 assert(std::all_of(std::begin(out), std::end(out), [](CopiedToTester& t) { return t.copied_to; }));
84 assert(std::none_of(std::begin(a), std::end(a), [](CopiedToTester& t) { return t.copied_to; }));
85 }
86 }
87 };
88
89 struct TestIteratorsNonTrivial {
90 template <class Iter2>
operator ()TestIteratorsNonTrivial91 void operator()() {
92 types::for_each(types::forward_iterator_list<CopiedToTester*>{},
93 TestIteratorWithPolicies<types::partial_instantiation<TestNonTrivial, Iter2>::template apply>{});
94 }
95 };
96
main(int,char **)97 int main(int, char**) {
98 types::for_each(types::forward_iterator_list<int*>{}, TestIteratorsInt{});
99 types::for_each(types::forward_iterator_list<CopiedToTester*>{}, TestIteratorsNonTrivial{});
100
101 return 0;
102 }
103