1  // -*- C++ -*-
       2  
       3  // Copyright (C) 2007-2023 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        for (__current++; __current != __end; __current++)
      59          {
      60            if (__comp(*__current, *__recent))
      61              {
      62                return false;
      63              }
      64            __recent = __current;
      65          }
      66  
      67        return true;
      68      }
      69  }
      70  
      71  #endif /* _GLIBCXX_PARALLEL_CHECKERS_H */