structures

structures

[Joerg Anders]

Hi all!

I'm a LISP, SCHEME and GUILE newbie.  I try to study
Artificial Intelligence.

My problem is: Most published examples use 
the

 	(define-struct ...)

function to create und use structures.

I already searched the GUILE mailing list archive and found
(define-struct ...)  seems to be no SCHEME standard
statement.(?)
Is that really true? Or can I load some module with
syntax extentions?
If not: What is a good substitute for (define-struct ...) ?

-- 
J.Anders, Chemnitz, GERMANY (ja@informatik.tu-chemnitz.de)


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Re: structures

[Andreas Rottmann]

Joerg Anders <j.anders@informatik.tu-chemnitz.de> writes:

> Hi all!
>
> I'm a LISP, SCHEME and GUILE newbie.  I try to study
> Artificial Intelligence.
>
> My problem is: Most published examples use the
>
>  	(define-struct ...)
>
> function to create und use structures.
>
> I already searched the GUILE mailing list archive and found
> (define-struct ...)  seems to be no SCHEME standard
> statement.(?)
>
True there is no standard (R5RS) way to define structures, but there
is SRFI-9 [0] (Defining record types). You can load it into guile with
(use-modules (srfi srfi-9)).

[0] http://srfi.schemers.org/srfi-9/srfi-9.html

> Is that really true? Or can I load some module with
> syntax extentions?
> If not: What is a good substitute for (define-struct ...) ?
>
You could also use GOOPS classes instead of structures.

HTH, Rotty
-- 
Andreas Rottmann         | Rotty@ICQ      | 118634484@ICQ | a.rottmann@gmx.at
http://yi.org/rotty      | GnuPG Key: http://yi.org/rotty/gpg.asc
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