(forgot to Cc to the list)

---------- Forwarded message ---------- From: Hans Hübner hans@huebner.org Date: 06.11.2006 14:24 Subject: Re: [bknr-devel] :read :update keywords meaning To: Kamen TOMOV kamen@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@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@common-lisp.net http://common-lisp.net/cgi-bin/mailman/listinfo/bknr-devel