#include <db_cxx.h>

extern "C" {
	typedef void *(*db_realloc_fcn_type)(void *, size_t);
};
int
Db::set_realloc(db_realloc_fcn_type db_realloc_fcn);

Description

Set the realloc function used by the Db methods to allocate memory in which to return key/data items to the application.

The DB_DBT_REALLOC flag, when specified in the Dbt object, will cause the Db methods to allocate and re-allocate memory which then becomes the responsibility of the calling application. See Dbt for more information.

On systems where there may be multiple library versions of realloc (notably Windows NT), specifying the DB_DBT_REALLOC flag will fail because the Db library will allocate memory from a different heap than the application will use to free it. To avoid this problem, the Db::set_realloc method can be used to pass Berkeley DB a reference to the application's allocation routine, in which case it will be used to allocate the memory returned when the DB_DBT_REALLOC flag is set.

The method specified must match the calling conventions of the ANSI C X3.159-1989 (ANSI C) library routine of the same name.

The Db::set_realloc interface may only be used to configure Berkeley DB before the Db::open interface is called.

The Db::set_realloc method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

Errors

EINVAL

An invalid flag value or parameter was specified.

Class

See Also