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Re: help with structure [message #70292 is a reply to message #70291]

Wed, 31 March 2010 15:37

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

pp writes:

> I suppose he means that by doing that, after the replicate(), all
> elements of a point to the same two heap variables.

I guess I don't follow you. Isn't this the meaning
of "replicate"?

> There is no way
> around it, he needs to loop on the elements to set the pointer on each
> one to point to something new.

Well, yes, but what else would he be doing?

Perhaps you (and he) mean to replicate a valid pointer
that points to nothing yet:

IDL> struct ={field:Ptr_New(/ALLOCATE_HEAP)}
IDL> a = Replicate(struct, 100)
IDL> Print, Ptr_Valid(a[50].field)
1
IDL> *a[50].field = 5

Just confused, I guess. :-(

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: help with structure By: penteado on Wed, 31 March 2010 18:50
		Re: help with structure By: David Fanning on Wed, 31 March 2010 16:13
		Re: help with structure By: penteado on Wed, 31 March 2010 15:47
		Re: help with structure By: David Fanning on Wed, 31 March 2010 15:42
		Re: help with structure By: David Fanning on Wed, 31 March 2010 15:37
		Re: help with structure By: Gray on Wed, 31 March 2010 15:12
		Re: help with structure By: penteado on Wed, 31 March 2010 14:49
		Re: help with structure By: David Fanning on Wed, 31 March 2010 14:40

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