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Re: Structure field concatenation [message #21602 is a reply to message #21581]

Thu, 31 August 2000 13:52

Ben Tupper
Messages: 186
Registered: August 1999

Senior Member

Craig Markwardt wrote:

>
> I meant computationally expensive. For some reason putting and
> extracting large data arrays in structures is not very efficient.
>

Hello and thanks to all,

My experience has been quite the same, shuffling large data arrays in and out
of structures is time consuming.

I guess I'm headed toward pointers as fields. In truth, that is what I have
now despite the example I posted, but I can't lose my original data set
(embedded in a database object), so I shall have to truck around a copy of the
user's last query definition in the form of a resulting data structure. The
issue comes to a head when the user calls for the data structure (via
GetProperty method.) I'll be standing there with a pointer filled structure
(correctly queried with something foolish like 'give me the sum of the males
and the transitionals'). I could just pass the data structure full of
pointers and allow the user to dereference the field pointers, or I could
build an anonymous structure filled with the derefenced fields. The former
is easy, but relys upon the good judgement of the caller not to free the
pointers. The latter seems safer, but I will still need to build a
structure.

Bing! I think I just got it. Make each of the structures (original and
queried subset) the same 'automatically defined' named variety complete with
pointers for each field. I'll still need to build a new derefenced anonymous
structure when the caller demands the queried subset data (or even all the
data for that matter) but I can live with that.

Thank you! Thank you! Thank you!

Ben

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Ben Tupper
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[Message index]

		Re: Structure field concatenation By: davidf on Tue, 05 September 2000 07:08
		Re: Structure field concatenation By: Amara Graps on Tue, 05 September 2000 05:47
		Re: Structure field concatenation By: Ben Tupper on Thu, 31 August 2000 13:52
		Re: Structure field concatenation By: Craig Markwardt on Thu, 31 August 2000 10:57
		Re: Structure field concatenation By: davidf on Thu, 31 August 2000 09:50
		Re: Structure field concatenation By: promashkin on Thu, 31 August 2000 09:22
		Re: Structure field concatenation By: Craig Markwardt on Thu, 31 August 2000 09:28
		Re: Structure field concatenation By: davidf on Thu, 31 August 2000 09:12
		Re: Structure field concatenation By: Amara Graps on Wed, 06 September 2000 06:31

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