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Re: When Ptr_New doesn't work [message #29016 is a reply to message #28954]

Wed, 23 January 2002 11:13

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

"Pavel A. Romashkin" wrote:
>
> I think the key here is, anything in parenthesis gets *evaluated* and as
> such is an expression. And it is not really surprising that one is not
> allowed to assign a value to an expression. This is the strength of IDL
> - it creates temporary variables as expressions, and allows to use them
> just like named variables. Unlike, say, IGOR Pro that requres you to
> define a named variable to even plot it.
>

Right. Another example of parentheses forming an expression is:

IDL> a=(b=1)

which is the only way to do chained assignments.

But as for the necessity of this, compare Perl, where things like:

($first, $second, @rest)=make_list();

are allowed. But heh, it's IDL.

JD

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[Message index]

		When Ptr_New doesn't work By: badenes on Tue, 22 January 2002 03:42
		Re: When Ptr_New doesn't work By: John-David T. Smith on Wed, 23 January 2002 11:13
		Re: When Ptr_New doesn't work By: Pavel A. Romashkin on Wed, 23 January 2002 10:07

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