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Diffstat (limited to 'libstdc++-v3/include/parallel/checkers.h')
| -rw-r--r-- | libstdc++-v3/include/parallel/checkers.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/libstdc++-v3/include/parallel/checkers.h b/libstdc++-v3/include/parallel/checkers.h new file mode 100644 index 00000000000..1c6bc355d17 --- /dev/null +++ b/libstdc++-v3/include/parallel/checkers.h @@ -0,0 +1,160 @@ +// -*- C++ -*- + +// Copyright (C) 2007, 2008 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. + +// As a special exception, you may use this file as part of a free +// software library without restriction. Specifically, if other files +// instantiate templates or use macros or inline functions from this +// file, or you compile this file and link it with other files to +// produce an executable, this file does not by itself cause the +// resulting executable to be covered by the GNU General Public +// License. This exception does not however invalidate any other +// reasons why the executable file might be covered by the GNU General +// Public License. + +/** @file parallel/checkers.h + * @brief Routines for checking the correctness of algorithm results. + * This file is a GNU parallel extension to the Standard C++ Library. + */ + +// Written by Johannes Singler. + +#ifndef _GLIBCXX_PARALLEL_CHECKERS +#define _GLIBCXX_PARALLEL_CHECKERS 1 + +#include <functional> +#include <cstdio> +#include <bits/stl_algobase.h> + +namespace __gnu_parallel +{ + /** + * @brief Check whether @c [begin, @c end) is sorted according to @c comp. + * @param begin Begin iterator of sequence. + * @param end End iterator of sequence. + * @param comp Comparator. + * @return @c true if sorted, @c false otherwise. + */ + // XXX Comparator default template argument + template<typename InputIterator, typename Comparator> + bool + is_sorted(InputIterator begin, InputIterator end, + Comparator comp + = std::less<typename std::iterator_traits<InputIterator>:: + value_type>()) + { + if (begin == end) + return true; + + InputIterator current(begin), recent(begin); + + unsigned long long position = 1; + for (current++; current != end; current++) + { + if (comp(*current, *recent)) + { + printf("is_sorted: check failed before position %i.\n", + position); + return false; + } + recent = current; + position++; + } + + return true; + } + + /** + * @brief Check whether @c [begin, @c end) is sorted according to @c comp. + * Prints the position in case an unordered pair is found. + * @param begin Begin iterator of sequence. + * @param end End iterator of sequence. + * @param first_failure The first failure is returned in this variable. + * @param comp Comparator. + * @return @c true if sorted, @c false otherwise. + */ + // XXX Comparator default template argument + template<typename InputIterator, typename Comparator> + bool + is_sorted_failure(InputIterator begin, InputIterator end, + InputIterator& first_failure, + Comparator comp + = std::less<typename std::iterator_traits<InputIterator>:: + value_type>()) + { + if (begin == end) + return true; + + InputIterator current(begin), recent(begin); + + unsigned long long position = 1; + for (current++; current != end; current++) + { + if (comp(*current, *recent)) + { + first_failure = current; + printf("is_sorted: check failed before position %lld.\n", + position); + return false; + } + recent = current; + position++; + } + + first_failure = end; + return true; + } + + /** + * @brief Check whether @c [begin, @c end) is sorted according to @c comp. + * Prints all unordered pair, including the surrounding two elements. + * @param begin Begin iterator of sequence. + * @param end End iterator of sequence. + * @param comp Comparator. + * @return @c true if sorted, @c false otherwise. + */ + template<typename InputIterator, typename Comparator> + bool + // XXX Comparator default template argument + is_sorted_print_failures(InputIterator begin, InputIterator end, + Comparator comp + = std::less<typename std::iterator_traits + <InputIterator>::value_type>()) + { + if (begin == end) + return true; + + InputIterator recent(begin); + bool ok = true; + + for (InputIterator pos(begin + 1); pos != end; pos++) + { + if (comp(*pos, *recent)) + { + printf("%ld: %d %d %d %d\n", pos - begin, *(pos - 2), + *(pos- 1), *pos, *(pos + 1)); + ok = false; + } + recent = pos; + } + return ok; + } +} + +#endif |