lib/ebitset.h

   1 /* Functions to support ebitsets.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _EBITSET_H
  20 #define _EBITSET_H
  21
  22 #include "bitset-int.h"
  23
  24 /* Number of words to use for each element.  */
  25 #ifndef EBITSET_ELT_WORDS
  26 #define EBITSET_ELT_WORDS 2
  27 #endif
  28
  29 /* Number of bits stored in each element.  */
  30 #define EBITSET_ELT_BITS \
  31   ((unsigned) (EBITSET_ELT_WORDS * BITSET_WORD_BITS))
  32
  33 /* Ebitset element.  We use an array of bits.  */
  34 typedef struct ebitset_elt_struct
  35 {
  36   union
  37   {
  38     bitset_word words[EBITSET_ELT_WORDS]; /* Bits that are set.  */
  39     struct ebitset_elt_struct *next;
  40   } u;
  41 } ebitset_elt;
  42
  43
  44 typedef ebitset_elt *ebitset_elts;
  45
  46 /* Head of ebitset linked list.  */
  47 typedef struct ebitset_struct
  48 {
  49   unsigned int size;            /* Number of elements.  */
  50   ebitset_elts *elts;           /* Expanding array of pointers to elements.  */
  51 } *ebitset;
  52
  53
  54 extern int ebitset_bytes PARAMS ((bitset_bindex));
  55
  56 extern void ebitset_release_memory PARAMS ((void));
  57
  58 #endif