You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
16 lines
529 B
Racket
16 lines
529 B
Racket
#lang racket/base
|
|
(require (for-syntax racket/base) "define.rkt")
|
|
|
|
(define+provide+safe (make-caching-proc base-proc)
|
|
(procedure? . -> . procedure?)
|
|
(let ([cache (make-hash)])
|
|
(λ args
|
|
(hash-ref! cache args (λ () (apply base-proc args))))))
|
|
|
|
(provide+safe define/caching)
|
|
(define-syntax (define/caching stx)
|
|
(syntax-case stx ()
|
|
[(_ (name arg ... . rest-arg) body ...)
|
|
#'(define/caching name (λ(arg ... . rest-arg) body ...))]
|
|
[(_ name body ...)
|
|
#'(define name (make-caching-proc body ...))])) |