def take_leaf

bendvy-ecs-core@0.1.0.3 · chunk_column.bend:227

import Base
import bendvy-ecs-core@0.1.0.3/lifecycle.bend as L

227def take_leaf(-S:Data,-C:Type,values:Array<Maybe<&1,C>>,stamps:Array<L.Stamp>,+index:U32,allowed:Bool) -> Column<S,C> & Maybe<&1,C>:
228  match allowed:
229    case False{}:(Leaf{values,stamps},None{})
230    case True{}:take_leaf_done(S,C,stamps,index,Array.swap(Maybe<&1,C>,values,index,None{}))