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Re: Need advice about inheritance [message #44196 is a reply to message #44098]

Sat, 21 May 2005 16:46

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

wcramer writes:

> I have two classes:
>
> ------
> "data": maintains a list of x, y data values and provide methods for
> operations between two "data" classes (i.e., "multiply", "add", etc.)
>
> "timedata": inherits "data" and treats x as time and y as value data
> ------
>
> Methods such as "add" should return another object instance of the same
> class as "self". 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? The functionality is exactly the same, so I
> really don't want to do that. Also, I can't dynamically define the
> class name for my call to obj_new because the init parameters are
> different.

Maybe I'm missing something, but if you want to copy the code
"verbatim", and the functionality is "exactly the same", can
it also be true that "the init parameters are different"!?
I'm confused. :-(

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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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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