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Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! [message #72167]

Thu, 19 August 2010 04:57

svhhaugan
Messages: 8
Registered: August 2010

Junior Member

On Aug 18, 8:45 pm, "Jeff N." <jeffnettles4...@gmail.com> wrote:
>> For IDL 8, the rules have suddenly been changed, with no warning
>> and no way to turn it off (other than staying with version 7).
>
> I don't know how you can say there was no warning - ITTVIS has been
> advertising the negative indexing feature for months now. And it was
> completely obvious to me from the get-go that the new indexing would
> have the effect on where() calls that you're talking about. It was
> one of the first things I thought of.

I guess we haven't been spending much time reading the advertising ;-)
Anyhow, that's not the kind of warning I referred to.

I think most researchers naively expect new features in a
"programming
language" to preserve the stated semantics of existing code, or at
least
provide (optional) warning mechanisms (compile-time or run-time)
that'll flag those cases where the semantics have been changed.

The help file for IDL 7 said "code similar to the following *can*
be used to avoid errors", not "code similar to the following
*should* be used, because we do not guarantee that an error will
occur in the next version of IDL".

Stein

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[Message index]

		Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! By: svhhaugan on Thu, 19 August 2010 04:57
		Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! By: jeffnettles4870 on Wed, 18 August 2010 11:45
		Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! By: svhhaugan on Wed, 18 August 2010 06:30
		Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! By: Haje Korth on Wed, 18 August 2010 05:30
		Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! By: Maarten[1] on Wed, 18 August 2010 05:14
		Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! By: Chris[7] on Thu, 19 August 2010 12:35

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