8.3 Indices
value
: "A contract defining the set of suport index types."
predicate
(graph-has-index? graph index-kind) → boolean?
graph : graph? index-kind : graph-index-kind/c
Return #t if graph supports an index of kind index-kind.
procedure
(graph-indexes graph) → (listof graph-index-kind/c)
graph : graph?
Return a list of the index kinds supported by the graph.
procedure
(graph-index graph index-kind)
→ (or/c (hash/c any/c (listof statement?)) #f) graph : graph? index-kind : graph-index-kind/c
Return the index maintained by graph, of kind index-kind if it is supported, else #f.
procedure
(graph-index-create graph index-kind) → void?
graph : graph? index-kind : graph-index-kind/c
Create a new index in graph, of kind index-kind, if one does not already exist.
procedure
(graph-index-drop graph index-kind) → void?
graph : graph? index-kind : graph-index-kind/c
Remove an index in graph, of kind index-kind, if it exist.