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sugar/sugar/cache.rkt

18 lines
570 B
Racket

#lang racket/base
(require (for-syntax
racket/base
"private/syntax-utils.rkt")
"define.rkt")
(define+provide+safe (make-caching-proc base-proc)
(procedure? . -> . procedure?)
(let ([cache (make-hash)])
(make-keyword-procedure
(λ (kws kw-args . args)
(hash-ref! cache (list* kws kw-args args) (λ () (keyword-apply base-proc kws kw-args args)))))))
(provide+safe define/caching)
(define-syntax (define/caching stx)
(with-syntax ([(ID LAMBDA-EXPR) (lambdafy stx)])
#'(define ID (make-caching-proc LAMBDA-EXPR))))