Scheme 48 is a programming language created in 1986 by Richard Kelsey and Jonathan Rees.
| #2511on PLDB | 38Years Old |
Scheme 48 is an implementation of Scheme written by Richard Kelsey and Jonathan Rees. The name ‘Scheme 48’ commemorates our having written the original version in forty-eight hours, on August 6th and 7th, 1986.
(define (make-counter)
(let ((value (make-cell 0)))
(lambda ()
(ensure-atomicity
(lambda ()
(let ((v (+ (provisional-cell-ref value)
1)))
(provisional-cell-set! value v)
v))))))