NAME

       todo - Todo List

       Global MDB_rel_func )(MDB_val *item, void *oldptr, void *newptr, void *relctx)
           This feature is currently unimplemented.

       Global mdb_set_relfunc (MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel)
           The relocation function is called whenever it is necessary to move the data of an item to a different
           position in the database (e.g. through tree balancing operations, shifts as a result of adds or
           deletes, etc.). It is intended to allow address/position-dependent data items to be stored in a
           database in an environment opened with the MDB_FIXEDMAP option. Currently the relocation feature is
           unimplemented and setting this function has no effect.