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Re: Defining Integer Field in a Structure [message #27819 is a reply to message #27736]

Tue, 06 November 2001 19:07

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

From: "Harvey Rarback" <rarback@slac.stanford.edu>
>>>> PRO newstruct__define.pro
>>>> struct = {NEWSTRUCT, a:0, b:0.0, c:fltarr(10)}
>>>> END
>> Certainly an instance of this structure gets created
>> in this routine, but its existence is fleeting. ...
> Yes. It's what I thought was happening. What bothered me
> was the overhead in creating the temporary structure.

First, the overhead is very small unless there are large amounts of data in
the structure. (And it's generally bad practice to include large amounts of
data in a named structure, because this is inflexible, so one generally uses
pointers instead.)

Second, the NEWSTRUCT__DEFINE procedure is normally run only once, when IDL
is asked to create a named structure and doesn't have a definition for it.
Of course, you can run it yourself as often as you like but this doesn't
achieve a great deal...

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield
National Institute for Water and Atmospheric Research

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[Message index]

		Defining Integer Field in a Structure By: sailfalmouth on Thu, 01 November 2001 13:07
		Re: Defining Integer Field in a Structure By: Mark Hadfield on Tue, 06 November 2001 19:07
		Re: Defining Integer Field in a Structure By: Harvey Rarback on Tue, 06 November 2001 18:09
		Re: Defining Integer Field in a Structure By: David Fanning on Tue, 06 November 2001 17:30

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