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85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
// { dg-do run { target c++11 } }
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// Copyright (C) 2009-2018 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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// XXX FIXME: parallel-mode should deal correctly with moveable-only types
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// per C++0x, at minimum smoothly fall back to serial.
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#undef _GLIBCXX_PARALLEL
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#include <algorithm>
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#include <testsuite_hooks.h>
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#include <testsuite_iterators.h>
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#include <testsuite_rvalref.h>
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using __gnu_test::test_container;
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using __gnu_test::random_access_iterator_wrapper;
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using __gnu_test::rvalstruct;
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typedef test_container<rvalstruct, random_access_iterator_wrapper> Container;
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const unsigned int N = 10000;
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int A[N]; // This is made global because we don't want it on the stack
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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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rvalstruct rv[N];
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std::copy(A, A + N, rv);
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Container con(rv, rv + N);
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std::random_shuffle(con.begin(), con.end());
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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(rv, rv + N, A) );
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std::sort(con.begin(), con.end());
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VERIFY( std::equal(rv, rv + N, A) );
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}
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int random_generator(int)
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{ return 0; }
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void
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test02()
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{
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rvalstruct rv[10] = {1,2,3,4,5,6,7,8,9,10};
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int result[10] = {10,1,2,3,4,5,6,7,8,9};
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Container con(rv, rv + 10);
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std::random_shuffle(con.begin(), con.end(), random_generator);
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// The above answer was generated by hand. It is not required by the standard,
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// but is produced by the current algorithm.
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VERIFY( std::equal(rv, rv + 10, result) );
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}
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int
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main()
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{
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test01();
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test02();
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return 0;
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}
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