1 // -*- C++ -*-
2 
3 // Copyright (C) 2007-2016 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
__is_sorted(_IIter __begin,_IIter __end,_Compare __comp)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