May be we can help better with a reference to the exercise. I really can't make up what you are trying to do. Jos
_____ From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org] On Behalf Of iam_h...@aol.in Sent: 08 August 2010 19:20 To: users@racket-lang.org Subject: [racket] message passing Hello schemers what if I have program of massage passing and I have to return the object when it is defined. example- (define (single-order) (let ( (delivery #f) ) (define (the-order req) (cond ((eq? req 'available) available) (else (error "the-order: unknown req: " req)) ) ) (define (available) (set! delivery #t)) the-order ) ) (define (available object) ((object 'available))) => now when I will run it like (define mcdon(single-order)) - it should return mcdon instead of <#unspecified> Any ideas??
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