1/* Inline Functions for bool-array.{h,cc}.
2
3 Copyright (C) 1989-1998, 2002 Free Software Foundation, Inc.
4 Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
5 and Bruno Haible <bruno@clisp.org>.
6
7 This file is part of GNU GPERF.
8
9 This program is free software: you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22// This needs:
23//#include <stdio.h>
24//#include <string.h>
25//#include "options.h"
26
27/* Initializes the bit array with room for SIZE bits, numbered from
28 0 to SIZE-1. */
29INLINE
30Bool_Array::Bool_Array (unsigned int size)
31 : _size (size),
32 _iteration_number (1),
33 _storage_array (new unsigned int [size])
34{
35 memset (_storage_array, 0, size * sizeof (_storage_array[0]));
36 if (option[DEBUG])
37 fprintf (stderr, "\nbool array size = %d, total bytes = %d\n",
38 _size,
39 static_cast<unsigned int> (_size * sizeof (_storage_array[0])));
40}
41
42/* Sets the specified bit to true.
43 Returns its previous value (false or true). */
44INLINE bool
45Bool_Array::set_bit (unsigned int index)
46{
47 if (_storage_array[index] == _iteration_number)
48 /* The bit was set since the last clear() call. */
49 return true;
50 else
51 {
52 /* The last operation on this bit was clear(). Set it now. */
53 _storage_array[index] = _iteration_number;
54 return false;
55 }
56}
57
58/* Resets all bits to zero. */
59INLINE void
60Bool_Array::clear ()
61{
62 /* If we wrap around it's time to zero things out again! However, this only
63 occurs once about every 2^32 iterations, so it will not happen more
64 frequently than once per second. */
65
66 if (++_iteration_number == 0)
67 {
68 _iteration_number = 1;
69 memset (_storage_array, 0, _size * sizeof (_storage_array[0]));
70 if (option[DEBUG])
71 {
72 fprintf (stderr, "(re-initialized bool_array)\n");
73 fflush (stderr);
74 }
75 }
76}
77