postgresql/contrib/btree_gist/btree_utils_num.h

typedef char GBT_NUMKEY;

/* Better readable key */
typedef struct
{
	const GBT_NUMKEY *lower,
			   *upper;
}	GBT_NUMKEY_R;


/* for sorting */
typedef struct
{
	int			i;
	GBT_NUMKEY *t;
}	Nsrt;


/* type description */

typedef struct
{

	/* Attribs */

	enum gbtree_type t;			/* data type */
	int32		size;			/* size of type , 0 means variable */

	/* Methods */

	bool		(*f_gt) (const void *, const void *);	/* greater then */
	bool		(*f_ge) (const void *, const void *);	/* greater equal */
	bool		(*f_eq) (const void *, const void *);	/* equal */
	bool		(*f_le) (const void *, const void *);	/* less equal */
	bool		(*f_lt) (const void *, const void *);	/* less then */
	int			(*f_cmp) (const void *, const void *);	/* key compare function */
}	gbtree_ninfo;


/*
 *	Numeric btree functions
*/


#define penalty_range_enlarge(olower,oupper,nlower,nupper) do { \
  res = 0; \
  if ( (nupper) > (oupper) ) \
	res += ( (nupper) - (oupper) ); \
  if (	(olower) > (nlower)  ) \
	res += ( (olower) - (nlower) ); \
} while (0);



extern bool gbt_num_consistent(const GBT_NUMKEY_R * key, const void *query,
				   const StrategyNumber *strategy, bool is_leaf,
				   const gbtree_ninfo * tinfo);

extern GIST_SPLITVEC *gbt_num_picksplit(const GistEntryVector *entryvec, GIST_SPLITVEC *v,
				  const gbtree_ninfo * tinfo);

extern GISTENTRY *gbt_num_compress(GISTENTRY *retval, GISTENTRY *entry,
				 const gbtree_ninfo * tinfo);


extern void *gbt_num_union(GBT_NUMKEY * out, const GistEntryVector *entryvec,
			  const gbtree_ninfo * tinfo);

extern bool gbt_num_same(const GBT_NUMKEY * a, const GBT_NUMKEY * b,
			 const gbtree_ninfo * tinfo);

extern void gbt_num_bin_union(Datum *u, GBT_NUMKEY * e,
				  const gbtree_ninfo * tinfo);