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fbd26352 | 1 | // Copyright (C) 2001-2019 Free Software Foundation, Inc. |
3494509a | 2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6bc9506f | 6 | // Free Software Foundation; either version 3, or (at your option) |
3494509a | 7 | // any later version. |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
6bc9506f | 15 | // with this library; see the file COPYING3. If not see |
16 | // <http://www.gnu.org/licenses/>. | |
3494509a | 17 | |
18 | // 25.2.11 random_shuffle() | |
19 | ||
20 | #include <algorithm> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
3494509a | 23 | const int N = 200000; |
24 | int A[N], s1[N]; | |
25 | ||
26 | #if _GLIBCXX_PARALLEL | |
27 | #define TAG , __gnu_parallel::sequential_tag() | |
28 | #else | |
29 | #define TAG | |
30 | #endif | |
31 | ||
32 | void fill_ascending() | |
33 | { | |
34 | for (int i = 0; i < N; ++i) | |
35 | A[i] = i; | |
36 | } | |
37 | ||
38 | void | |
39 | test01() | |
40 | { | |
41 | fill_ascending(); | |
42 | #if _GLIBCXX_PARALLEL | |
43 | for (int num_threads = 1; num_threads <= 2; ++num_threads) | |
44 | { | |
45 | omp_set_num_threads(num_threads); | |
46 | #endif | |
47 | std::copy(A, A + N, s1); | |
48 | VERIFY(std::equal(s1, s1 + N, A TAG)); | |
49 | ||
50 | std::random_shuffle(s1, s1 + N); | |
51 | // the chance that random_shuffle leaves the order as is by coincidence | |
52 | // is negligible, so we expect it to be permuted | |
53 | VERIFY(!std::equal(s1, s1 + N, A TAG)); | |
54 | ||
55 | std::sort(s1, s1 + N TAG); | |
56 | VERIFY(std::equal(s1, s1 + N, A TAG)); | |
57 | #if _GLIBCXX_PARALLEL | |
58 | } | |
59 | #endif | |
60 | } | |
61 | ||
62 | int | |
63 | main() | |
64 | { | |
65 | #if _GLIBCXX_PARALLEL | |
66 | __gnu_parallel::_Settings gpms = __gnu_parallel::_Settings::get(); | |
67 | gpms.algorithm_strategy = __gnu_parallel::force_parallel; | |
68 | __gnu_parallel::_Settings::set(gpms); | |
69 | #endif | |
70 | test01(); | |
71 | return 0; | |
72 | } |