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      1 // -*- C++ -*-
      2 
      3 // Copyright (C) 2007-2013 Free Software Foundation, Inc.
      4 //
      5 // This file is part of the GNU ISO C++ Library.  This library is free
      6 // software; you can redistribute it and/or modify it under the terms
      7 // of the GNU General Public License as published by the Free Software
      8 // Foundation; either version 3, or (at your option) any later
      9 // version.
     10 
     11 // This library is distributed in the hope that it will be useful, but
     12 // WITHOUT ANY WARRANTY; without even the implied warranty of
     13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14 // General Public License for more details.
     15 
     16 // Under Section 7 of GPL version 3, you are granted additional
     17 // permissions described in the GCC Runtime Library Exception, version
     18 // 3.1, as published by the Free Software Foundation.
     19 
     20 // You should have received a copy of the GNU General Public License and
     21 // a copy of the GCC Runtime Library Exception along with this program;
     22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     23 // <http://www.gnu.org/licenses/>.
     24 
     25 /** @file parallel/checkers.h
     26  *  @brief Routines for checking the correctness of algorithm results.
     27  *  This file is a GNU parallel extension to the Standard C++ Library.
     28  */
     29 
     30 // Written by Johannes Singler.
     31 
     32 #ifndef _GLIBCXX_PARALLEL_CHECKERS_H
     33 #define _GLIBCXX_PARALLEL_CHECKERS_H 1
     34 
     35 #include <cstdio>
     36 #include <bits/stl_algobase.h>
     37 #include <bits/stl_function.h>
     38 
     39 namespace __gnu_parallel
     40 {
     41   /**
     42    * @brief Check whether @c [__begin, @c __end) is sorted according
     43    * to @c __comp.
     44    * @param __begin Begin iterator of sequence.
     45    * @param __end End iterator of sequence.
     46    * @param __comp Comparator.
     47    * @return @c true if sorted, @c false otherwise.
     48    */
     49   template<typename _IIter, typename _Compare>
     50     bool
     51     __is_sorted(_IIter __begin, _IIter __end, _Compare __comp)
     52     {
     53       if (__begin == __end)
     54         return true;
     55 
     56       _IIter __current(__begin), __recent(__begin);
     57 
     58       unsigned long long __position = 1;
     59       for (__current++; __current != __end; __current++)
     60         {
     61           if (__comp(*__current, *__recent))
     62             {
     63               return false;
     64             }
     65           __recent = __current;
     66           __position++;
     67         }
     68 
     69       return true;
     70     }
     71 }
     72 
     73 #endif /* _GLIBCXX_PARALLEL_CHECKERS_H */
     74