dict.h

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/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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 *
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 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
 *
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/*
** Author: Eric Veach, July 1994.
**
*/

#ifndef __dict_list_h_
#define __dict_list_h_

/* Use #define's so that another heap implementation can use this one */

#define DictKey      DictListKey
#define Dict      DictList
#define DictNode  DictListNode

#define dictNewDict(frame,leq)      __gl_dictListNewDict(frame,leq)
#define dictDeleteDict(dict)     __gl_dictListDeleteDict(dict)

#define dictSearch(dict,key)     __gl_dictListSearch(dict,key)
#define dictInsert(dict,key)     __gl_dictListInsert(dict,key)
#define dictInsertBefore(dict,node,key)   __gl_dictListInsertBefore(dict,node,key)
#define dictDelete(dict,node)    __gl_dictListDelete(dict,node)

#define dictKey(n)         __gl_dictListKey(n)
#define dictSucc(n)        __gl_dictListSucc(n)
#define dictPred(n)        __gl_dictListPred(n)
#define dictMin(d)         __gl_dictListMin(d)
#define dictMax(d)         __gl_dictListMax(d)



typedef void *DictKey;
typedef struct Dict Dict;
typedef struct DictNode DictNode;

Dict     *dictNewDict(
         void *frame,
         int (*leq)(void *frame, DictKey key1, DictKey key2) );
         
void     dictDeleteDict( Dict *dict );

/* Search returns the node with the smallest key greater than or equal
 * to the given key.  If there is no such key, returns a node whose
 * key is NULL.  Similarly, Succ(Max(d)) has a NULL key, etc.
 */
DictNode *dictSearch( Dict *dict, DictKey key );
DictNode *dictInsertBefore( Dict *dict, DictNode *node, DictKey key );
void     dictDelete( Dict *dict, DictNode *node );

#define     __gl_dictListKey(n)  ((n)->key)
#define     __gl_dictListSucc(n) ((n)->next)
#define     __gl_dictListPred(n) ((n)->prev)
#define     __gl_dictListMin(d)  ((d)->head.next)
#define     __gl_dictListMax(d)  ((d)->head.prev)
#define         __gl_dictListInsert(d,k) (dictInsertBefore((d),&(d)->head,(k)))


/*** Private data structures ***/

struct DictNode {
  DictKey   key;
  DictNode  *next;
  DictNode  *prev;
};

struct Dict {
  DictNode  head;
  void      *frame;
  int    (*leq)(void *frame, DictKey key1, DictKey key2);
};

#endif