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Re: Need advice about inheritance [message #44192 is a reply to message #44098]

Sun, 22 May 2005 23:28

Antonio Santiago
Messages: 201
Registered: February 2004

Senior Member

Before programming you need to stop and thing about your classes,
inheritance and relations.

> Methods such as "add" should return another object instance of the
> same class as "self".

Only for curiosity. ADD returns a new instance or the same instance with
the addition?

> Is there a way to get "add" to return a "timedata"
> object without having to copy the method verbatim from the "data"
> class to the "timedata" class?

Yes, don't write an "ADD" method for TIMEDATA and use the inherited from
DATA.

> The functionality is exactly the same, so I really don't want to do
> that.

what? Perhaps it hasn't got the same functionality. (Perhaps here, my
poor english doesn't bring me to use the correct words). That is, maybe
the concept is the same (the addition) but it is not the same integer
addition than "house" (objects) addition.

> Also, I can't dynamically define the class name for my call to obj_new
> because the init parameters are different.

Perhaps you can use keyword parameters in addition to some kind of
"template pattern". That is, you need your DATA::Init and TIMEDATA::Init
has the same positional parameters in addition to their respective
keyword parameters.
Now, you can call OBJ_NEW('DATA', d1) or OBJ_NEW('TIMEDATA', d1, XX=d2)
because they have the same parameters.

I don't know if this can be hopeful for you.
Bye.

--
-----------------------------------------------------
Antonio Santiago Pï¿½rez
( email: santiago<<at>>grahi.upc.edu )
( www: http://www.grahi.upc.edu/santiago )
( www: http://asantiago.blogsite.org )
-----------------------------------------------------
GRAHI - Grup de Recerca Aplicada en Hidrometeorologia
Universitat Politï¿½cnica de Catalunya
-----------------------------------------------------

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[Message index]

		Need advice about inheritance By: wcramer on Sat, 21 May 2005 08:03
		Re: Need advice about inheritance By: Antonio Santiago on Mon, 23 May 2005 08:34
		Re: Need advice about inheritance By: wcramer on Tue, 07 June 2005 10:48
		Re: Need advice about inheritance By: Antonio Santiago on Fri, 10 June 2005 02:21
		Re: Need advice about inheritance By: marc schellens[1] on Fri, 10 June 2005 01:06
		Re: Need advice about inheritance By: wcramer on Mon, 23 May 2005 08:13
		Re: Need advice about inheritance By: wcramer on Mon, 23 May 2005 08:00
		Re: Need advice about inheritance By: Michael Wallace on Fri, 10 June 2005 11:46
		Re: Need advice about inheritance By: Antonio Santiago on Sun, 22 May 2005 23:28
		Re: Need advice about inheritance By: David Fanning on Sat, 21 May 2005 16:46

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