Hash_dh.h

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#ifndef HASH_D_DH
#define HASH_D_DH

/* todo: rehash should be implemented in Hash_dhInsert();
         as of now, an error is set if the table overflows.
*/

#include "euclid_common.h"

/* This should be done with templates, if this were in C++;
   for now, a record contains every type of entry we might
   need; this is a waste of memory, when one is only intersted
   in hashing <key, int> pairs!
*/
#ifdef __cplusplus
extern "C"
{
#endif

  typedef struct _hash_node
  {
    int iData;          /* integer */
    double fData;       /* float */
    int *iDataPtr;      /* pointer to integer */
    int *iDataPtr2;     /* pointer to integer */
    double *fDataPtr;       /* pointer to float */
  } HashData;


  typedef struct _hash_node_private HashRecord;

/* data structure for the hash table; do not directly access */
  struct _hash_dh
  {
    int size;           /* total slots in table */
    int count;          /* number of insertions in table */
    int curMark;
    HashRecord *data;
  };


  extern void Hash_dhCreate (Hash_dh * h, int size);
  extern void Hash_dhDestroy (Hash_dh h);
  extern void Hash_dhInsert (Hash_dh h, int key, HashData * data);
  extern HashData *Hash_dhLookup (Hash_dh h, int key);
  /* returns NULL if record isn't found. */

  extern void Hash_dhReset (Hash_dh h);
  extern void Hash_dhPrint (Hash_dh h, FILE * fp);


#define HASH_1(k,size,idxOut)    \
         {  *idxOut = k % size;  }

#define HASH_2(k,size,idxOut)      \
          {  \
            int r = k % (size-13); \
            r = (r % 2) ? r : r+1; \
            *idxOut = r;           \
          }

#ifdef __cplusplus
}
#endif
#endif