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A* -------------------------------------------------------------------
B* This file contains source code for the PyMOL computer program
C* copyright 1998-2000 by Warren Lyford Delano of DeLano Scientific. 
D* -------------------------------------------------------------------
E* It is unlawful to modify or remove this copyright notice.
F* -------------------------------------------------------------------
G* Please see the accompanying LICENSE file for further information. 
H* -------------------------------------------------------------------
I* Additional authors of this source file include:
Z* -------------------------------------------------------------------

#ifndef _H_Tracker
#define _H_Tracker

#include "PyMOLGlobals.h"

/* Tracker is a generic data structure for tracking lists of
   candidates in a manner that:

   (1) is robust with respect to creation and deletion of candidates and lists
   (2) enables efficient iteration over the lists to which a candidate belongs
   (3) enables efficient iteration over the candidates to which a list belongs
   (4) is double-linked so that insertion and deletion take constant time
   (5) keeps running counts so that length determination takes constant time


typedef struct _CTracker CTracker;

typedef void *TrackerRef;

CTracker *TrackerNew(PyMOLGlobals *G);
void TrackerFree(CTracker *I);

/* creating and deleting candidates, lists, and iterators */

int TrackerNewCand(CTracker *I, TrackerRef *ref);
int TrackerDelCand(CTracker *I, int cand_id);

int TrackerNewList(CTracker *I, TrackerRef *ref);
int TrackerDelList(CTracker *I, int list_id);
int TrackerNewListCopy(CTracker *I, int list_id, TrackerRef *ref);

int TrackerNewIter(CTracker *I, int cand_id, int list_id);
int TrackerDelIter(CTracker *I, int iter_id);

/* creating and destroying links */

int TrackerLink(CTracker *I, int cand_id, int list_id, int priority);
int TrackerUnlink(CTracker *I, int cand_id, int list_id);

/* querying */

int TrackerGetNList(CTracker *I);
int TrackerGetNCand(CTracker *I);
int TrackerGetNLink(CTracker *I);
int TrackerGetNIter(CTracker *I);
int TrackerGetNListForCand(CTracker *I,int cand_id);
int TrackerGetNCandForList(CTracker *I,int list_id);

int TrackerGetCandRef(CTracker *I,int cand_id, TrackerRef **ref_ret);

/* iterating */

int TrackerIterNextCandInList(CTracker *I, int iter_id, TrackerRef **ref_ret);
int TrackerIterNextListInCand(CTracker *I, int iter_id, TrackerRef **ref_ret);

int TrackerUnitTest(PyMOLGlobals *G);


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