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84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
// Copyright (C) 2005-2019 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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// 25.3.9 [lib.alg.permutation.generators]
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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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using __gnu_test::test_container;
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using __gnu_test::bidirectional_iterator_wrapper;
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using std::prev_permutation;
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typedef test_container<int, bidirectional_iterator_wrapper> Container;
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void
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test1()
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{
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// Note: The standard is unclear on what should happen in this case.
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// This seems the only really sensible behaviour, and what is done.
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int array[] = {0};
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Container con(array, array);
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VERIFY(!prev_permutation(con.begin(), con.end()));
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}
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void
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test2()
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{
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int array[] = {0};
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Container con(array, array + 1);
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VERIFY(!prev_permutation(con.begin(), con.end()));
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}
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void
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test3()
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{
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int array[] = {3, 0};
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Container con(array, array + 2);
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VERIFY(prev_permutation(con.begin(), con.end()));
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VERIFY(array[0] == 0 && array[1] == 3);
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VERIFY(!prev_permutation(con.begin(), con.end()));
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VERIFY(array[0] == 3 && array[1] == 0);
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}
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void
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test4()
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{
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int array[6] = {5, 4, 3, 2, 1, 0};
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Container con(array, array + 6);
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for(int i = 0 ; i < 719; ++i)
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{
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int temp_array[6];
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std::copy(array, array + 6, temp_array);
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VERIFY(prev_permutation(array, array + 6));
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VERIFY(std::lexicographical_compare(array, array + 6,
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temp_array, temp_array + 6));
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}
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VERIFY(!prev_permutation(array,array + 6));
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for(int i = 0; i < 6; ++i)
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VERIFY(array[i] == 5 - i);
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}
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int main()
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{
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test1();
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test2();
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test3();
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test4();
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}
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