libstdc++
checkers.h
Go to the documentation of this file.
00001 // -*- C++ -*-
00002 
00003 // Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the terms
00007 // of the GNU General Public License as published by the Free Software
00008 // Foundation; either version 3, or (at your option) any later
00009 // version.
00010 
00011 // This library is distributed in the hope that it will be useful, but
00012 // WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014 // General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file parallel/checkers.h
00026  *  @brief Routines for checking the correctness of algorithm results.
00027  *  This file is a GNU parallel extension to the Standard C++ Library.
00028  */
00029 
00030 // Written by Johannes Singler.
00031 
00032 #ifndef _GLIBCXX_PARALLEL_CHECKERS_H
00033 #define _GLIBCXX_PARALLEL_CHECKERS_H 1
00034 
00035 #include <cstdio>
00036 #include <bits/stl_algobase.h>
00037 #include <bits/stl_function.h>
00038 
00039 namespace __gnu_parallel
00040 {
00041   /**
00042    * @brief Check whether @c [__begin, @c __end) is sorted according
00043    * to @c __comp.
00044    * @param __begin Begin iterator of sequence.
00045    * @param __end End iterator of sequence.
00046    * @param __comp Comparator.
00047    * @return @c true if sorted, @c false otherwise.
00048    */
00049   template<typename _IIter, typename _Compare>
00050     bool
00051     __is_sorted(_IIter __begin, _IIter __end, _Compare __comp)
00052     {
00053       if (__begin == __end)
00054         return true;
00055 
00056       _IIter __current(__begin), __recent(__begin);
00057 
00058       unsigned long long __position = 1;
00059       for (__current++; __current != __end; __current++)
00060         {
00061           if (__comp(*__current, *__recent))
00062             {
00063               return false;
00064             }
00065           __recent = __current;
00066           __position++;
00067         }
00068 
00069       return true;
00070     }
00071 }
00072 
00073 #endif /* _GLIBCXX_PARALLEL_CHECKERS_H */