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Re: IDL objects and names [message #34064 is a reply to message #33970]

Wed, 12 February 2003 08:42

Randall Skelton
Messages: 169
Registered: October 2000

Senior Member

> No, I'm afraid it is true. One of the huge disadvantages of
> IDL objects is that they are based on named structures, which
> means the field names in the structure can't be duplicated.
> In practice, this makes it hard to have deep inheritance
> hierarchies. But what is even worse, is it makes it extremely
> difficult to have multiple inheritance hierarchies.

IMHO, this isn't simply a huge disadvantage, but a colossal problem. If
you look at some of tricks employed in Martin Shultz's scientific objects
or the HESSI objects, you begin to realize much of the power of objects is
squandered by RSI's limited implementation. This combined with the lack
of public methods and operator overloading seriously reduces the
usefulness of OOP in IDL for actual computing. I agree with David that
you can write relatively simple objects with strict naming for an inherited
level or two; alas, as soon as you start to work with complex objects
with many levels, you end up chasing name clashes and conflicting
containers.

I can only hope that this will be fixed once and for all in IDL 6.

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[Message index]

		IDL objects and names By: s[1] on Wed, 12 February 2003 03:32
		Re: IDL objects and names By: David Fanning on Wed, 12 February 2003 17:36
		Re: IDL objects and names By: Rick Towler on Wed, 12 February 2003 14:17
		Re: IDL objects and names By: dick on Wed, 12 February 2003 13:47
		Re: IDL objects and names By: David Fanning on Wed, 12 February 2003 13:38
		Re: IDL objects and names By: Rick Towler on Wed, 12 February 2003 12:50
		Re: IDL objects and names By: Pavel A. Romashkin on Wed, 12 February 2003 10:38
		Re: IDL objects and names By: Randall Skelton on Wed, 12 February 2003 08:42
		Re: IDL objects and names By: David Fanning on Wed, 12 February 2003 07:16
		Re: IDL objects and names By: David Fanning on Wed, 12 February 2003 07:09
		Re: IDL objects and names By: s[1] on Wed, 12 February 2003 06:37
		Re: IDL objects and names By: David Fanning on Wed, 12 February 2003 05:33

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