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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libstdc++-v3/testsuite/25_algorithms/next_permutation/1.cc | |
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Diffstat (limited to 'libstdc++-v3/testsuite/25_algorithms/next_permutation/1.cc')
-rw-r--r-- | libstdc++-v3/testsuite/25_algorithms/next_permutation/1.cc | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/25_algorithms/next_permutation/1.cc b/libstdc++-v3/testsuite/25_algorithms/next_permutation/1.cc new file mode 100644 index 000000000..e00ca261a --- /dev/null +++ b/libstdc++-v3/testsuite/25_algorithms/next_permutation/1.cc @@ -0,0 +1,83 @@ +// Copyright (C) 2005, 2009 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING3. If not see +// <http://www.gnu.org/licenses/>. + +// 25.3.9 [lib.alg.permutation.generators] + +#include <algorithm> +#include <testsuite_hooks.h> +#include <testsuite_iterators.h> + +using __gnu_test::test_container; +using __gnu_test::bidirectional_iterator_wrapper; +using std::next_permutation; + +typedef test_container<int, bidirectional_iterator_wrapper> Container; + +void +test1() +{ + // Note: The standard is unclear on what should happen in this case. + // This seems the only really sensible behaviour, and what is done. + int array[] = {0}; + Container con(array, array); + VERIFY(!next_permutation(con.begin(), con.end())); +} + +void +test2() +{ + int array[] = {0}; + Container con(array, array + 1); + VERIFY(!next_permutation(con.begin(), con.end())); +} + +void +test3() +{ + int array[] = {0, 3}; + Container con(array, array + 2); + VERIFY(next_permutation(con.begin(), con.end())); + VERIFY(array[0] == 3 && array[1] == 0); + VERIFY(!next_permutation(con.begin(), con.end())); + VERIFY(array[0] == 0 && array[1] == 3); +} + +void +test4() +{ + int array[6] = {0, 1, 2, 3, 4, 5}; + Container con(array, array + 6); + for(int i = 0 ; i < 719; ++i) + { + int temp_array[6]; + std::copy(array, array + 6, temp_array); + VERIFY(next_permutation(array, array + 6)); + VERIFY(std::lexicographical_compare(temp_array, temp_array + 6, + array, array + 6)); + } + VERIFY(!next_permutation(array,array + 6)); + for(int i = 0; i < 6; ++i) + VERIFY(array[i] == i); +} + +int main() +{ + test1(); + test2(); + test3(); + test4(); +} |