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Diffstat (limited to 'libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc')
-rw-r--r-- | libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc b/libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc new file mode 100644 index 00000000000..530e032d7fc --- /dev/null +++ b/libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc @@ -0,0 +1,84 @@ +// Copyright (C) 2005 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 2, 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 COPYING. If not, write to the Free +// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, +// USA. + +// 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::prev_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(!prev_permutation(con.begin(), con.end())); +} + +void +test2() +{ + int array[] = {0}; + Container con(array, array + 1); + VERIFY(!prev_permutation(con.begin(), con.end())); +} + +void +test3() +{ + int array[] = {3, 0}; + Container con(array, array + 2); + VERIFY(prev_permutation(con.begin(), con.end())); + VERIFY(array[0] == 0 && array[1] == 3); + VERIFY(!prev_permutation(con.begin(), con.end())); + VERIFY(array[0] == 3 && array[1] == 0); +} + +void +test4() +{ + int array[6] = {5, 4, 3, 2, 1, 0}; + Container con(array, array + 6); + for(int i = 0 ; i < 719; ++i) + { + int temp_array[6]; + std::copy(array, array + 6, temp_array); + VERIFY(prev_permutation(array, array + 6)); + VERIFY(std::lexicographical_compare(array, array + 6, + temp_array, temp_array + 6)); + } + VERIFY(!prev_permutation(array,array + 6)); + for(int i = 0; i < 6; ++i) + VERIFY(array[i] == 5 - i); +} + +int main() +{ + test1(); + test2(); + test3(); + test4(); +} |