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[dragonfly.git] / contrib / gcc-4.7 / libstdc++-v3 / include / parallel / for_each.h
1 // -*- C++ -*-
2
3 // Copyright (C) 2007, 2008, 2009, 2010 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/for_each.h
26  *  @brief Main interface for embarrassingly parallel functions.
27  *
28  *  The explicit implementation are in other header files, like
29  *  workstealing.h, par_loop.h, omp_loop.h, and omp_loop_static.h.
30  *  This file is a GNU parallel extension to the Standard C++ Library.
31  */
32
33 // Written by Felix Putze.
34
35 #ifndef _GLIBCXX_PARALLEL_FOR_EACH_H
36 #define _GLIBCXX_PARALLEL_FOR_EACH_H 1
37
38 #include <parallel/settings.h>
39 #include <parallel/par_loop.h>
40 #include <parallel/omp_loop.h>
41 #include <parallel/workstealing.h>
42
43 namespace __gnu_parallel
44 {
45   /** @brief Chose the desired algorithm by evaluating @c __parallelism_tag.
46    *  @param __begin Begin iterator of input sequence.
47    *  @param __end End iterator of input sequence.
48    *  @param __user_op A user-specified functor (comparator, predicate,
49    *  associative operator,...)
50    *  @param __functionality functor to @a process an element with
51    *  __user_op (depends on desired functionality, e. g. accumulate,
52    *  for_each,...
53    *  @param __reduction Reduction functor.
54    *  @param __reduction_start Initial value for reduction.
55    *  @param __output Output iterator.
56    *  @param __bound Maximum number of elements processed.
57    *  @param __parallelism_tag Parallelization method */
58   template<typename _IIter, typename _UserOp,
59            typename _Functionality, typename _Red, typename _Result>
60     _UserOp
61     __for_each_template_random_access(_IIter __begin, _IIter __end,
62                                       _UserOp __user_op,
63                                       _Functionality& __functionality,
64                                       _Red __reduction,
65                                       _Result __reduction_start,
66                                       _Result& __output, typename
67                                       std::iterator_traits<_IIter>::
68                                       difference_type __bound,
69                                       _Parallelism __parallelism_tag)
70     {
71       if (__parallelism_tag == parallel_unbalanced)
72         return __for_each_template_random_access_ed
73           (__begin, __end, __user_op, __functionality, __reduction,
74            __reduction_start, __output, __bound);
75       else if (__parallelism_tag == parallel_omp_loop)
76         return __for_each_template_random_access_omp_loop
77           (__begin, __end, __user_op, __functionality, __reduction,
78            __reduction_start, __output, __bound);
79       else if (__parallelism_tag == parallel_omp_loop_static)
80         return __for_each_template_random_access_omp_loop
81           (__begin, __end, __user_op, __functionality, __reduction,
82            __reduction_start, __output, __bound);
83       else      //e. g. parallel_balanced
84         return __for_each_template_random_access_workstealing
85           (__begin, __end, __user_op, __functionality, __reduction,
86            __reduction_start, __output, __bound);
87   }
88 }
89
90 #endif /* _GLIBCXX_PARALLEL_FOR_EACH_H */