#define MDB_IDL_N( ids ) ( MDB_IDL_IS_RANGE(ids) \
? ((ids)[2]-(ids)[1])+1 : (ids)[0] )
+#if 0 /* superseded by append/sort */
/** Insert an ID into an IDL.
* @param[in,out] ids The IDL to insert into.
* @param[in] id The ID to insert.
* @return 0 on success, -1 if the ID was already present in the IDL.
*/
int mdb_midl_insert( IDL ids, ID id );
+#endif
/** Append an ID onto an IDL.
* @param[in,out] ids The IDL to append to.