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Re: Creating pointer in structure [message #27745 is a reply to message #27737]

Thu, 01 November 2001 08:56

Pavel A. Romashkin
Messages: 531
Registered: November 2000

Senior Member

I use both ways, but I prefer /ALLOCATE. The /ALLOCATE is very
convenient when you know your pointer must be defined, and it saves time
when the pointer is filled later. I sometimes do not allocate heap if
the pointer may not be required (like a UVALUE property of an object,
for example). I rarely check on validity of pointers because I make my
code issue an error earlier, at the INIT stage, if a vital pointer is
not filled with necessary data, so Paul's remark does not really apply
in my case. For writing object methods, having valid pointers makes it a
lot easier, especially if a field is changeable by several methods.

Cheers,
Pavel

"K. Bowman" wrote:
>
> 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
>
> Thanks, Ken

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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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