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Re: Q: Array of Structures [message #12041 is a reply to message #12023]

Sun, 14 June 1998 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <MPG.feb2857db08f77a989681@news.frii.com>,
David Fanning <davidf@dfanning.com> wrote:
> But, look. I just tried this:
>
> a = { data:FltArr(10), name:'' }
> b = { data:FltArr(10), name:'' }
> c = [a, b]
> % Conflicting data structures: B,concatenation.
> % Execution halted at: $MAIN$
>
> But now, I try this:
>
> a = { data:FltArr(10), name:'' }
> b = a
> c = [a, b]
>
> No problem!

I think that the problems it that the first example creates anonymous
structures for each variable. Because the structures won't have the
same tag (anonymous structures are still tagged invisibly), they are
treated as different structure types. The problem goes away for tagged
structures. The following works just fine.

a = {StruTag, data:FltArr(10), name:'' }
b = {StruTag, data:FltArr(10), name:'' }
c = [a, b]

In the second example, the assignment gives b the same structure tag
as a, so the concatenation works just fine.

Personally, I'd like to see IDL check for identical anonymous structures
and set the structure tags appropriately.

Eric
--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
<a href="http://sag-www.ssl.berkeley.edu/~korpela">Click for home page.</a>

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[Message index]

		Re: Q: Array of Structures By: Vap User on Wed, 17 June 1998 00:00
		Re: Q: Array of Structures By: korpela on Sun, 14 June 1998 00:00
		Re: Q: Array of Structures By: J.D. Smith on Fri, 12 June 1998 00:00
		Re: Q: Array of Structures By: davidf on Fri, 12 June 1998 00:00
		Re: Q: Array of Structures By: Saeid.Zoonematkermani on Fri, 12 June 1998 00:00
		Re: Q: Array of Structures By: davidf on Fri, 12 June 1998 00:00

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