SQLite

** ^The sqlite3_bind_pointer(S,I,P,T) routine causes the I-th parameter in
** [prepared statement] S to have an SQL value of NULL, but to also be
** associated with the pointer P of type T.
** ^The sqlite3_bind_pointer() routine can be used to pass
** host-language pointers into [application-defined SQL functions].
** ^A parameter that is initialized using [sqlite3_bind_pointer()] appears
** to be an ordinary SQL NULL value to everything other than
** [sqlite3_value_pointer()].  The T parameter should be a static string,
** preferably a string literal.  The procedure that invokes 
** sqlite3_bind_pointer(S,I,P,T) continues to own the P and T pointers and
** must guarantee that those pointers remain valid until after the last
** access via [sqlite3_value_pointer()].  The sqlite3_bind_pointer() routine
** is part of the [pointer passing interface] added for SQLite 3.20.0.
**
** ^If any of the sqlite3_bind_*() routines are called with a NULL pointer
** for the [prepared statement] or with a prepared statement for which
** [sqlite3_step()] has been called more recently than [sqlite3_reset()],
** then the call will return [SQLITE_MISUSE].  If any sqlite3_bind_()
** routine is passed a [prepared statement] that has been finalized, the
** result is undefined and probably harmful.

** kind of [sqlite3_value] object can be used with this interface.
**
** ^The sqlite3_result_pointer(C,P,T) interface sets the result to an
** SQL NULL value, just like [sqlite3_result_null(C)], except that it
** also associates the host-language pointer P or type T with that 
** NULL value such that the pointer can be retrieved within an
** [application-defined SQL function] using [sqlite3_value_pointer()].
** The T parameter should be a static string and preferably a string
** literal. The procedure that invokes sqlite3_result_pointer(C,P,T)
** continues to own the P and T pointers and must guarantee that 
** those pointers remain valid until after the last access via
** [sqlite3_value_pointer()].  The sqlite3_result_pointer() routine
** is part of the [pointer passing interface] added for SQLite 3.20.0.
**
** If these routines are called from within the different thread
** than the one containing the application-defined function that received
** the [sqlite3_context] pointer, the results are undefined.
*/
void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_blob64(sqlite3_context*,const void*,