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**651**- (**download**) (**annotate**)*Thu Jun 1 18:34:03 2000 UTC*(19 years ago) by*monnier*File size: 989 byte(s)

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(* * Acyclic subgraph adaptor. This takes a linear order of node id * return a view in which only the edges (and nodes) consistent with * the linear order is visible. * * -- Allen *) signature ACYCLIC_SUBGRAPH_VIEW = sig (* Acyclic node induced subgraph *) val acyclic_view : Graph.node_id list -> ('n,'e,'g) Graph.graph -> ('n,'e,'g) Graph.graph end structure AcyclicSubgraphView : ACYCLIC_SUBGRAPH_VIEW = struct structure G = Graph structure A = HashArray structure S = Subgraph_P_View fun acyclic_view nodes (G as G.GRAPH g) = let val ord = A.array(#capacity g (),~1) fun order(i,[]) = () | order(i,n::ns) = (A.update(ord,n,i); order(i+1,ns)) val _ = order(0,nodes) fun node_p i = A.sub(ord,i) >= 0 fun edge_p (i,j) = let val i = A.sub(ord,i) in i >= 0 andalso i < A.sub(ord,j) end in S.subgraph_p_view nodes node_p edge_p G end end

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