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Re: Need advice about inheritance [message #44303 is a reply to message #44182]

Tue, 07 June 2005 10:48

wcramer
Messages: 9
Registered: February 2005

Junior Member

Sorry that it's taken me so long to respond to your post, "Mr. A"; I
got sidetracked with something else.

Let's do this with code so it will be more clear. Here's what I have:

function data::add,data2
...
result = obj_new('data', <data init params>)
...
return, result
end

I want this function to return a TIMEDATA object if called with a
TIMEDATA object. There are two ways that I can think of to do this:

(1) Override the ADD function in the TIMEDATA class:

function timedata::add,timedata2
...
temp = data::add(timedata2)
result = obj_new('timedata', data = temp)
...
return, result
end

I really don't want to do this.

(2) Dynamically pass the class type to OBJ_NEW:

function data::add,data2
...
result = obj_new(obj_class(self), <common data/timedata init params>)
...
return, result
end

The problem with this method is that I define the INIT parameters as
keyword parameters, and the parameter names are different for DATA and
TIMEDATA. I can't convert the parameters to positional parameters
because INIT allows multiple possibilities of initialization (MATRIX,
SIZE, or X/TIMES and Y/VALUES)

Is there a better way to do this that I haven't thought of?

Thanks,
Doug

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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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