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/* Inline Functions for bool-array.{h,cc}.
Copyright (C) 1989-1998, 2002 Free Software Foundation, Inc.
Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
and Bruno Haible <bruno@clisp.org>.
This file is part of GNU GPERF.
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
// This needs:
//#include <stdio.h>
//#include <string.h>
//#include "options.h"
/* Initializes the bit array with room for SIZE bits, numbered from
0 to SIZE-1. */
INLINE
Bool_Array::Bool_Array (unsigned int size)
: _size (size),
_iteration_number (1),
_storage_array (new unsigned int [size])
{
memset (_storage_array, 0, size * sizeof (_storage_array[0]));
if (option[DEBUG])
fprintf (stderr, "\nbool array size = %d, total bytes = %d\n",
_size,
static_cast<unsigned int> (_size * sizeof (_storage_array[0])));
}
/* Sets the specified bit to true.
Returns its previous value (false or true). */
INLINE bool
Bool_Array::set_bit (unsigned int index)
{
if (_storage_array[index] == _iteration_number)
/* The bit was set since the last clear() call. */
return true;
else
{
/* The last operation on this bit was clear(). Set it now. */
_storage_array[index] = _iteration_number;
return false;
}
}
/* Resets all bits to zero. */
INLINE void
Bool_Array::clear ()
{
/* If we wrap around it's time to zero things out again! However, this only
occurs once about every 2^32 iterations, so it will not happen more
frequently than once per second. */
if (++_iteration_number == 0)
{
_iteration_number = 1;
memset (_storage_array, 0, _size * sizeof (_storage_array[0]));
if (option[DEBUG])
{
fprintf (stderr, "(re-initialized bool_array)\n");
fflush (stderr);
}
}
}
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