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https://github.com/autc04/Retro68.git
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75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
// Copyright (C) 2001-2014 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// 25.2.11 random_shuffle()
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#include <algorithm>
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#include <testsuite_hooks.h>
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bool test __attribute__((unused)) = true;
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const int N = 200000;
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int A[N], s1[N];
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#if _GLIBCXX_PARALLEL
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#define TAG , __gnu_parallel::sequential_tag()
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#else
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#define TAG
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#endif
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void fill_ascending()
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{
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for (int i = 0; i < N; ++i)
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A[i] = i;
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}
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void
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test01()
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{
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fill_ascending();
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#if _GLIBCXX_PARALLEL
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for (int num_threads = 1; num_threads <= 2; ++num_threads)
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{
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omp_set_num_threads(num_threads);
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#endif
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std::copy(A, A + N, s1);
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VERIFY(std::equal(s1, s1 + N, A TAG));
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std::random_shuffle(s1, s1 + N);
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// the chance that random_shuffle leaves the order as is by coincidence
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// is negligible, so we expect it to be permuted
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VERIFY(!std::equal(s1, s1 + N, A TAG));
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std::sort(s1, s1 + N TAG);
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VERIFY(std::equal(s1, s1 + N, A TAG));
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#if _GLIBCXX_PARALLEL
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}
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#endif
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}
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int
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main()
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{
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#if _GLIBCXX_PARALLEL
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__gnu_parallel::_Settings gpms = __gnu_parallel::_Settings::get();
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gpms.algorithm_strategy = __gnu_parallel::force_parallel;
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__gnu_parallel::_Settings::set(gpms);
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#endif
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test01();
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return 0;
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}
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