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Re: Preserving Variables [message #10204 is a reply to message #10197]

Tue, 28 October 1997 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Matthew Hanson (matt@ktaadn.com) writes:

> Anyone know how to make statis variables? That is, upon returning to a
> function, how can i create a variable that has the same value as when i
> left the function before? I really don't want to use Common Blocks.

I'm not sure how this could be done in a regular IDL
function without common blocks (I say this knowing I
am risking my reputation among students who have heard
my anti-commmon block lectures :-). Perhaps with Save/Restore
functionality, but I have to think, why bother?

In a widget program this kind of thing is easily accomplished
with either pointers or user values. See any of the widget
programs on my web page for examples. I guess you could do
it with pointers with a regular function too, as long as
the pointer was passed into the function as a parameter.

output = My_Function(ptrToStaticVariables)

Cheers,

David
-----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Preserving Variables By: Stein Vidar Hagfors H on Fri, 31 October 1997 00:00
		Re: Preserving Variables By: thompson on Thu, 30 October 1997 00:00
		Re: Preserving Variables By: R. Bauer on Wed, 29 October 1997 00:00
		Re: Preserving Variables By: davidf on Tue, 28 October 1997 00:00

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