/*
** 2010 August 30
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
*/
#ifndef _SQLITE3RTREE_H_
#define _SQLITE3RTREE_H_
#include <sqlite3.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct sqlite3_rtree_geometry sqlite3_rtree_geometry;
/*
** Register a geometry callback named zGeom that can be used as part of an
** R-Tree geometry query as follows:
**
** SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
*/
int sqlite3_rtree_geometry_callback(
sqlite3 *db,
const char *zGeom,
int (*xGeom)(sqlite3_rtree_geometry *, int nCoord, double *aCoord, int *pRes),
void *pContext
);
/*
** A pointer to a structure of the following type is passed as the first
** argument to callbacks registered using rtree_geometry_callback().
*/
struct sqlite3_rtree_geometry {
void *pContext; /* Copy of pContext passed to s_r_g_c() */
int nParam; /* Size of array aParam[] */
double *aParam; /* Parameters passed to SQL geom function */
void *pUser; /* Callback implementation user data */
void (*xDelUser)(void *); /* Called by SQLite to clean up pUser */
};
#ifdef __cplusplus
} /* end of the 'extern "C"' block */
#endif
#endif /* ifndef _SQLITE3RTREE_H_ */