[Chicken-users] Re: coops / override initialize-instance

[John J Foerch]

Felix <address@hidden> writes:
> From: John J Foerch <address@hidden>
> Subject: [Chicken-users] coops / override initialize-instance
> Date: Tue, 08 Mar 2011 16:30:32 -0500
>
>> Hello,
>> 
>> What is the recommended way to perform complex initialization of object
>> instances in coops?  Say I need to initialize a certain slot based on
>> the values of other slots in the object.  Is the initialize-instance
>> generic designed in a way that it is safe to do something like this:
>> 
>>   (define-method (initialize-instance (o <myobject))
>>     ;; initialization code here
>>     )
>> 
>> or is it recommended to write a wrapper function like this:
>> 
>>   (define (make-myobject a b c)
>>     (let ((o (make <myobject> 'a a 'b b 'c c)))
>>       ;; initialization code here
>>       o))
>
> "initialize-instance" is the right way to do it. You just should make
> sure to use "call-next-method" before you you can refer to other
> slots, because the default method initializes all slots with their
> default values.
>
>
> cheers,
> felix


elegant; thank you very much.

-- 
John Foerch