#include <db_cxx.h> int Db::get_partition_callback(u_int32_t *partsp, u_int32_t (**callback_fcn) (DB *dbp, DBT *key);
        The Db::get_partition_callback() method
        returns the database partitioning callback as set by the 
        Db::set_partition()
        method.
    
         The Db::get_partition_callback() method
         may be called at any time during the life of the application.
    
         The Db::get_partition_callback() 
            
            
                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.