Pointers and references: Difference between revisions

=={{header|EchoLisp}}==

No pointers in EchoLisp. '''Boxes ''' or vectors can be used to perform call-by-reference operations.

<lang scheme>

(define B (box 42))

→ B ;; box reference

(unbox B)

→ 42 ;; box contents

;; sets new value for box contents

(define ( change-by-ref abox avalue)

(set-box! abox avalue) )

(change-by-ref B 666)

→ #[box 666]

(unbox B)

→ 666

</lang>