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Re: IDL killer [message #43006 is a reply to message #42199]

Mon, 14 March 2005 07:56

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

David Fanning wrote:
> m_schellens@hotmail.com writes:
>
>> ++(((a=1))=3)
>
> I think it must be a general rule by now that any time
> you fail to have a LHS of an expression in IDL (by, for
> example, putting the RHS in parentheses and thereby
> making it a temporary variable) there is an excellent
> chance you will crash IDL. Just on the face of it,
> I would guess there must be an almost unlimited
> number of these expressions.

Well, I am sure it also crashes with other values,
what makes it almost infinite :-)

But here we DON'T fail to have a LHS!

IDL> help,(((a=1))=3)
A INT = 3

> I'm not so sure this is a bug as much as it is a peek
> into the underlying structure of the IDL code. In any
> case, I'm not surprised by it any longer.

Even though I would call it a bug, there is hardly a
case where such a construct would make sense (please post
whoever can think of one).
Generally assignment expressions shouldn't be alowed on LHS
of expressions.

Ah, did I mention that GDL (http://gnudatalanguage.sf.net)
refuses them, but does not crash :-)

Cheers,
marc

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[Message index]

		IDL killer By: marc schellens[1] on Wed, 19 January 2005 05:23
		Re: IDL killer By: wmconnolley on Fri, 21 January 2005 11:22
		Re: IDL killer By: R.G.Stockwell on Wed, 19 January 2005 16:25
		Re: IDL killer By: R.G.Stockwell on Wed, 19 January 2005 16:11
		Re: IDL killer By: R.G.Stockwell on Wed, 19 January 2005 16:10
		Re: IDL killer By: David Fanning on Wed, 19 January 2005 15:28
		Re: IDL killer By: JD Smith on Wed, 19 January 2005 14:54
		Re: IDL killer By: Robert Barnett on Wed, 19 January 2005 14:35
		Re: IDL killer By: R.G.Stockwell on Wed, 19 January 2005 09:51
		Re: IDL killer By: Paolo Grigis on Wed, 19 January 2005 06:54
		Re: IDL killer By: Ben Panter on Wed, 19 January 2005 05:35
		Re: IDL killer By: David Fanning on Mon, 14 March 2005 08:15
		Re: IDL killer By: marc schellens[1] on Mon, 14 March 2005 07:56
		Re: IDL killer By: Y.T. on Mon, 21 March 2005 13:33
		Re: IDL killer By: David Fanning on Mon, 14 March 2005 05:14
		Re: IDL killer By: Haje Korth on Mon, 14 March 2005 05:06
		Re: IDL killer By: David Fanning on Mon, 21 March 2005 13:38

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