Array-b.cc

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/*

Copyright (C) 1996-2012 John W. Eaton

This file is part of Octave.

Octave 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 of the License, or (at your
option) any later version.

Octave 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.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

// Instantiate Arrays of bool values.

#include "Array.h"
#include "Array.cc"
#define INLINE_ASCENDING_SORT
#define INLINE_DESCENDING_SORT
#include "oct-sort.cc"

// Specialize bool sorting (aka stable partitioning).

template<bool desc>
static void do_bool_partition (bool *data, octave_idx_type nel)
{
  octave_idx_type k = 0;
  for (octave_idx_type i = 0; i < nel; i++)
    if (data[i] == desc)
      data[k++] = desc;
  for (octave_idx_type i = k; i < nel; i++)
    data[i] = ! desc;
}

template<bool desc>
static void do_bool_partition (bool *data, octave_idx_type *idx,
                               octave_idx_type nel)
{
  // FIXME: This is essentially a simple bucket sort.
  // Can it be efficiently done by std::partition?
  OCTAVE_LOCAL_BUFFER (octave_idx_type, jdx, nel);
  octave_idx_type k = 0, l = 0;
  for (octave_idx_type i = 0; i < nel; i++)
    {
      if (data[i] == desc)
        {
          data[k] = desc;
          idx[k++] = idx[i];
        }
      else
        jdx[l++] = idx[i];
    }

  for (octave_idx_type i = k; i < nel; i++)
    {
      data[i] = ! desc;
      idx[i] = jdx[i-k];
    }
}

template <> template <>
void
octave_sort<bool>::sort (bool *data, octave_idx_type nel,
                         std::less<bool>)
{
  do_bool_partition<false> (data, nel);
}

template <> template <>
void
octave_sort<bool>::sort (bool *data, octave_idx_type nel,
                         std::greater<bool>)
{
  do_bool_partition<true> (data, nel);
}

template <> template <>
void
octave_sort<bool>::sort (bool *data, octave_idx_type *idx, octave_idx_type nel,
                         std::less<bool>)
{
  do_bool_partition<false> (data, idx, nel);
}

template <> template <>
void
octave_sort<bool>::sort (bool *data, octave_idx_type *idx, octave_idx_type nel,
                         std::greater<bool>)
{
  do_bool_partition<true> (data, idx, nel);
}

INSTANTIATE_ARRAY_SORT (bool);

INSTANTIATE_ARRAY (bool, OCTAVE_API);

template OCTAVE_API std::ostream& operator << (std::ostream&, const Array<bool>&);

#include "DiagArray2.h"
#include "DiagArray2.cc"

template class OCTAVE_API DiagArray2<bool>;