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📄 algo.h(102.35 KB)
📄 algobase.h(10.88 KB)
📄 algorithm(1.35 KB)
📄 algorithmfwd.h(29.46 KB)
📄 balanced_quicksort.h(15.78 KB)
📄 base.h(12.02 KB)
📄 basic_iterator.h(1.57 KB)
📄 checkers.h(4.5 KB)
📄 compatibility.h(10.06 KB)
📄 compiletime_settings.h(2.75 KB)
📄 equally_split.h(3.12 KB)
📄 features.h(3.5 KB)
📄 find.h(13.96 KB)
📄 find_selectors.h(6.93 KB)
📄 for_each.h(3.58 KB)
📄 for_each_selectors.h(9.57 KB)
📄 iterator.h(5.15 KB)
📄 list_partition.h(5.79 KB)
📄 losertree.h(25.12 KB)
📄 merge.h(9.33 KB)
📄 multiseq_selection.h(16.31 KB)
📄 multiway_merge.h(71.04 KB)
📄 multiway_mergesort.h(15.12 KB)
📄 numeric(19.04 KB)
📄 numericfwd.h(6.77 KB)
📄 omp_loop.h(3.9 KB)
📄 omp_loop_static.h(3.94 KB)
📄 par_loop.h(4.43 KB)
📄 parallel.h(1.54 KB)
📄 partial_sum.h(6.88 KB)
📄 partition.h(14.56 KB)
📄 queue.h(4.79 KB)
📄 quicksort.h(5.78 KB)
📄 random_number.h(3.72 KB)
📄 random_shuffle.h(17.28 KB)
📄 search.h(5.47 KB)
📄 set_operations.h(14.13 KB)
📄 settings.h(10.73 KB)
📄 sort.h(7.25 KB)
📄 tags.h(5.96 KB)
📄 types.h(4.02 KB)
📄 unique_copy.h(5.67 KB)
📄 workstealing.h(9.85 KB)

Editing: equally_split.h

// -*- C++ -*-

// Copyright (C) 2007, 2009 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, or (at your option) any later
// version.

// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file parallel/equally_split.h
 *  This file is a GNU parallel extension to the Standard C++ Library.
 */

// Written by Johannes Singler.

#ifndef _GLIBCXX_PARALLEL_EQUALLY_SPLIT_H
#define _GLIBCXX_PARALLEL_EQUALLY_SPLIT_H 1

namespace __gnu_parallel
{
/** @brief Function to split a sequence into parts of almost equal size.
 *
 *  The resulting sequence s of length num_threads+1 contains the splitting
 *  positions when splitting the range [0,n) into parts of almost
 *  equal size (plus minus 1).  The first entry is 0, the last one
 *  n. There may result empty parts.
 *  @param n Number of elements
 *  @param num_threads Number of parts
 *  @param s Splitters
 *  @returns End of splitter sequence, i. e. @c s+num_threads+1 */
template<typename difference_type, typename OutputIterator>
  OutputIterator
  equally_split(difference_type n, thread_index_t num_threads, OutputIterator s)
  {
    difference_type chunk_length = n / num_threads;
    difference_type num_longer_chunks = n % num_threads;
    difference_type pos = 0;
    for (thread_index_t i = 0; i < num_threads; ++i)
      {
        *s++ = pos;
        pos += (i < num_longer_chunks) ? (chunk_length + 1) : chunk_length;
      }
    *s++ = n;
    return s;
  }

/** @brief Function to split a sequence into parts of almost equal size.
 *
 *  Returns the position of the splitting point between
 *  thread number thread_no (included) and
 *  thread number thread_no+1 (excluded).
 *  @param n Number of elements
 *  @param num_threads Number of parts
 *  @returns _SplittingAlgorithm point */
template<typename difference_type>
  difference_type
  equally_split_point(difference_type n,
                      thread_index_t num_threads,
                      thread_index_t thread_no)
  {
    difference_type chunk_length = n / num_threads;
    difference_type num_longer_chunks = n % num_threads;
    if (thread_no < num_longer_chunks)
      return thread_no * (chunk_length + 1);
    else
      return num_longer_chunks * (chunk_length + 1)
          + (thread_no - num_longer_chunks) * chunk_length;
  }
}

#endif /* _GLIBCXX_PARALLEL_EQUALLY_SPLIT_H */

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