def cached_stamp

bendvy-ecs-core@0.1.0.3 · execution_query_store.bend:16

import Base
import bendvy-ecs-core@0.1.0.3/execution_query_matches.bend as Q
import bendvy-ecs-core@0.1.0.3/lifecycle.bend as Life

16def cached_stamp(-V:Data,rows:List<&2,Q.Row<V>>,+index:U32) -> Life.Stamp:
17  match rows:
18    case []:Life.Stamp{None{},None{}}
19    case +row <> rest:Life.choose(U32.is_eq(index,Q.row_offset(V,row)),Q.row_stamp(V,row),cached_stamp(V,rest,index))