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Re: Creating pointer in structure [message #27751 is a reply to message #27749]

Thu, 01 November 2001 07:01

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

K. Bowman (k-bowma@null.tamu.edu) writes:

> If I need to define a structure containing a pointer before I know the
> characteristics of the associated heap variable, which of the following
> is preferable? Does it make any difference, or is it simply a matter
> of programming taste?
>
>
> For example:
>
> a = {point: PTR_NEW()} ;Create struct w/ null pointer
> ... figure out what n is
> a.point = PTR_NEW(FINDGEN(n)) ;Replace null pointer
>
>
> or
>
>
> b = {point: PTR_NEW(/ALLOCATE_HEAP)} ;Create struct w/ pointer->undef
> ... figure out what n is
> *b.point = FINDGEN(n) ;Define heap var

I think it is a matter of programming taste,
although I have to admit, I find the latter
formulation easier to work with in larger,
more complicated programs because I don't have
to worry about whether the pointer is valid or not.

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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[Message index]

		Re: Creating pointer in structure By: hcp on Fri, 02 November 2001 08:31
		Re: Creating pointer in structure By: Ron Syml on Fri, 02 November 2001 08:02
		Re: Creating pointer in structure By: K. Bowman on Fri, 02 November 2001 07:21
		Re: Creating pointer in structure By: John-David T. Smith on Thu, 01 November 2001 14:49
		Re: Creating pointer in structure By: Pavel A. Romashkin on Thu, 01 November 2001 14:19
		Re: Creating pointer in structure By: John-David T. Smith on Thu, 01 November 2001 12:57
		Re: Creating pointer in structure By: Pavel A. Romashkin on Thu, 01 November 2001 08:56
		Re: Creating pointer in structure By: Paul van Delst on Thu, 01 November 2001 07:07
		Re: Creating pointer in structure By: David Fanning on Thu, 01 November 2001 07:01

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