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Re: On Pointers and Culture [message #42994 is a reply to message #42991]

Fri, 04 March 2005 00:16

Antonio Santiago
Messages: 201
Registered: February 2004

Senior Member

Michael Wallace wrote:
> I've finally reached an impasse in my IDL programming. Arrays just
> aren't doing it for me anymore. As of a few minutes ago I starting
> teaching myself IDL pointers. Does IDL already have implementations of
> the common data structures such as stacks, queues and trees or will I
> need to compose my own? I figured it was easier to ask the group and go
> to bed (it's 1:30AM local time) and see responses in the morning than
> trying to slog through IDL documentation at such a late hour. Although
> the documentation would probably make better sense now...
>
> -Mike

You can found basic data structures in RSI user contributed library
( http://www.rsinc.com/codebank/search.asp?search=category& ;product=IDL&catid=16)
. See the hashtable and vector.

Also D.Fanning has a linkedlist implementation
(http://www.dfanning.com/programs/linkedlist__define.pro)

and Craig Markwardt has an implemententation of hash
( http://cow.physics.wisc.edu/~craigm/idl/down/hashtable__defi ne.pro).

With all this you have: hashtables, lists and staks.

If you are new on IDL pointers remember are not the same as C pointers.
Now you have your "conventional" memory (managed by IDL) and the HEAP
memory (managed by yourself).

a = INDGEN(100)
p = PTR_NEW(a)

This lines creates an 'a' vector and 'p' pointer variable in the
conventional memory, also copies the same 'a' vector into HEAP memory a
makes 'p' points this.
Maybe, it is better:

p = PTR_NEW( INDGEN(100) )

Now, you only have a 'p' pointer variable in conventional memory and an
array in the HEAP memory.

Bye.
Antonio

(Sorry about mu poor enligh :)

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[Message index]

		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 12:28
		Re: On Pointers and Culture By: JD Smith on Fri, 04 March 2005 12:01
		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 08:06
		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 08:04
		Re: On Pointers and Culture By: Benjamin Hornberger on Fri, 04 March 2005 07:47
		Re: On Pointers and Culture By: Benjamin Hornberger on Fri, 04 March 2005 07:46
		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 06:05
		Re: On Pointers and Culture By: Antonio Santiago on Fri, 04 March 2005 05:13
		Re: On Pointers and Culture By: David Lopez Pons on Fri, 04 March 2005 03:25
		Re: On Pointers and Culture By: Antonio Santiago on Fri, 04 March 2005 00:16

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