(forgot to Cc to the list)
---------- Forwarded message ----------
From: Hans Hübner <hans(a)huebner.org>
Date: 06.11.2006 14:24
Subject: Re: [bknr-devel] :read :update keywords meaning
To: Kamen TOMOV <kamen(a)cybuild.com>
Hi Kamen,
:read means that a slot reader method is automatically defined,
:update means that a reader and a writer method is defined.
If you have a class
(define-persistent-class foo ()
((slot-a :read)
(slot-b :update)))
then macroexpanding this will yield:
(defclass foo (store-object)
((slot-a :reader foo-slot-a :initarg :slot-a)
(slot-b :accessor foo-slot-b :initarg :slot-b))
(:metaclass persistent-class))
Thus, :read gives you a :reader method whereas :update yields an
:accessor. Both create a :initarg so that you can initialize the
slots in a make-object. Note that nothing prevents you from writing
to a :read slot using change-slot-values or setf.
C-c C-m in slime macroexpands a s-expression, which is pretty handy.
Cheers,
-Hans
2006/11/6, Kamen TOMOV <kamen(a)cybuild.com>:
> Hi,
>
> I tried to find in the documentation the meaning of the :read and
> :update slot options in define-persistent-class and I couldn't. Then I
> tried in the source and got lost :-)
>
> Could you please help? Thanks!
>
> --
> Kamen
> _______________________________________________
> bknr-devel mailing list
> bknr-devel(a)common-lisp.net
> http://common-lisp.net/cgi-bin/mailman/listinfo/bknr-devel
>
Hi,
I tried to find in the documentation the meaning of the :read and
:update slot options in define-persistent-class and I couldn't. Then I
tried in the source and got lost :-)
Could you please help? Thanks!
--
Kamen
