33 lines
940 B
Racket
33 lines
940 B
Racket
#lang typed/racket
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;https://stackoverflow.com/questions/65386334/racket-generic-graph-library-in-typed-racket
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(module graph-wrapper racket
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(require (prefix-in g: graph))
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(provide graph?
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directed-graph
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has-edge?
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graphviz)
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(struct graph (g))
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(define (directed-graph es [ws #f])
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(graph (g:directed-graph es ws)))
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(define (has-edge? g u v)
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(g:has-edge? (graph-g g) u v))
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(define (graphviz g #:output [output #f] #:colors [colors #f])
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(g:graphviz (graph-g g) #:output output #:colors colors)))
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(require/typed 'graph-wrapper
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[#:opaque Graph graph?]
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[directed-graph (->* ((Listof (List Any Any))) ((Listof Any)) Graph)]
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[has-edge? (-> Graph Any Any Boolean)]
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[graphviz (->* (Graph)
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(#:output Output-Port
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#:colors (HashTable Any Natural))
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String)])
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(define g (directed-graph '((a b) (b c))))
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(has-edge? g 'a 'c)
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(graphviz g)
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