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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/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 */
  91.