Racket/Scheme: working with structs

Question

I have been given a struct to work with:

(struct Binding (id (value #:mutable)))

This struct represents a variable binding such as (set! x 3) where I would expect id = x and value = 3.

How do I create and initialize this struct? How do I get the values of id and value and to set the value of value?

Re: textbook request. Have you seen "How To Design Programs"? It's written by the authors of Racket, it's got five stars on Amazon, and best of all, it's available online at htdp.org. — John Clements
– John Clements, Commented Feb 28, 2011 at 16:53

Eli Barzilay · Accepted Answer · 2011-02-28 05:57:26Z

4

> (struct Binding (id (value #:mutable)))
> (define b (Binding 'x 123))
> (Binding-id b)
'x
> (Binding-value b)
123
> (set-Binding-value! b 456)
> (Binding-value b)
456

(See also the documentation page on structs.)

answered Feb 28, 2011 at 5:57

Eli Barzilay

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