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// -*- C++ -*-
// Copyright (C) 2007, 2008, 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @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_H
#define _GLIBCXX_PARALLEL_CHECKERS_H 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 /* _GLIBCXX_PARALLEL_CHECKERS_H */
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