79 lines
2.4 KiB
Plaintext
79 lines
2.4 KiB
Plaintext
/* Inline Functions for bool-array.{h,cc}.
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Copyright (C) 1989-1998, 2002 Free Software Foundation, Inc.
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Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
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and Bruno Haible <bruno@clisp.org>.
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This file is part of GNU GPERF.
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GNU GPERF is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU GPERF is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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// This needs:
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//#include <stdio.h>
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//#include <string.h>
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//#include "options.h"
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/* Initializes the bit array with room for SIZE bits, numbered from
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0 to SIZE-1. */
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INLINE
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Bool_Array::Bool_Array (unsigned int size)
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: _size (size),
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_iteration_number (1),
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_storage_array (new unsigned int [size])
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{
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memset (_storage_array, 0, size * sizeof (_storage_array[0]));
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if (option[DEBUG])
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fprintf (stderr, "\nbool array size = %d, total bytes = %d\n",
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_size,
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static_cast<unsigned int> (_size * sizeof (_storage_array[0])));
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}
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/* Sets the specified bit to true.
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Returns its previous value (false or true). */
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INLINE bool
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Bool_Array::set_bit (unsigned int index)
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{
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if (_storage_array[index] == _iteration_number)
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/* The bit was set since the last clear() call. */
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return true;
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else
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{
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/* The last operation on this bit was clear(). Set it now. */
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_storage_array[index] = _iteration_number;
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return false;
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}
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}
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/* Resets all bits to zero. */
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INLINE void
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Bool_Array::clear ()
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{
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/* If we wrap around it's time to zero things out again! However, this only
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occurs once about every 2^32 iterations, so it will not happen more
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frequently than once per second. */
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if (++_iteration_number == 0)
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{
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_iteration_number = 1;
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memset (_storage_array, 0, _size * sizeof (_storage_array[0]));
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if (option[DEBUG])
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{
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fprintf (stderr, "(re-initialized bool_array)\n");
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fflush (stderr);
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}
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}
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}
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