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 <class InputIterator, class OutputIterator1,
12 // class OutputIterator2, class Predicate>
13 // constexpr pair<OutputIterator1, OutputIterator2> // constexpr after C++17
14 // partition_copy(InputIterator first, InputIterator last,
15 // OutputIterator1 out_true, OutputIterator2 out_false,
16 // Predicate pred);
17
18 #include <algorithm>
19 #include <cassert>
20
21 #include "test_macros.h"
22 #include "test_iterators.h"
23
24 struct is_odd
25 {
operator ()is_odd26 TEST_CONSTEXPR bool operator()(const int& i) const {return i & 1;}
27 };
28
29 #if TEST_STD_VER > 17
test_constexpr()30 TEST_CONSTEXPR bool test_constexpr() {
31 int ia[] = {1, 3, 5, 2, 4, 6};
32 int r1[10] = {0};
33 int r2[10] = {0};
34
35 auto p = std::partition_copy(std::begin(ia), std::end(ia),
36 std::begin(r1), std::begin(r2), is_odd());
37
38 return std::all_of(std::begin(r1), p.first, is_odd())
39 && std::all_of(p.first, std::end(r1), [](int a){return a == 0;})
40 && std::none_of(std::begin(r2), p.second, is_odd())
41 && std::all_of(p.second, std::end(r2), [](int a){return a == 0;})
42 ;
43 }
44 #endif
45
main(int,char **)46 int main(int, char**)
47 {
48 {
49 const int ia[] = {1, 2, 3, 4, 6, 8, 5, 7};
50 int r1[10] = {0};
51 int r2[10] = {0};
52 typedef std::pair<output_iterator<int*>, int*> P;
53 P p = std::partition_copy(cpp17_input_iterator<const int*>(std::begin(ia)),
54 cpp17_input_iterator<const int*>(std::end(ia)),
55 output_iterator<int*>(r1), r2, is_odd());
56 assert(p.first.base() == r1 + 4);
57 assert(r1[0] == 1);
58 assert(r1[1] == 3);
59 assert(r1[2] == 5);
60 assert(r1[3] == 7);
61 assert(p.second == r2 + 4);
62 assert(r2[0] == 2);
63 assert(r2[1] == 4);
64 assert(r2[2] == 6);
65 assert(r2[3] == 8);
66 }
67
68 #if TEST_STD_VER > 17
69 static_assert(test_constexpr());
70 #endif
71
72 return 0;
73 }
74