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Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 [message #83337 is a reply to message #83335]

Thu, 21 February 2013 07:58

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Thursday, February 21, 2013 4:17:15 PM UTC+1, markbates wrote:
> that's scary. I would hate to inadvertently use a structure like this
>
> in my code which could cause such a slowdown. What changed between
>
> IDL 8.1 and 8.2 which could account for this? Even in 8.1 we already
>
> have the 'dot' operator for accessing object methods...?
>
>
>
> any response from Excelis?
>
>
>
> Mark

Dear Mark,
some time ago I ran into a problem with objects vs structures and Chris Torrence from IDL just mentioned that this was corrected starting with version 8.2.1.
See the post: https://groups.google.com/d/msg/comp.lang.idl-pvwave/uz886Nk HqMo/a5WsD7sz1bEJ

So basically I found that calling a structure with an object reference could be done only like this
PRINT, (self.FirstObj).Var1
where FirstObj is a property of the object that points to another object.
In IDL 8.2.1 you may use this syntax:
PRINT, self.FirstObj.Var1

Yes, so there is a difference between versions earlier than 8.2.0 and starting from 8.2.1 the new syntax is accepted and therefore at run time it has to be checked if it is an object.method or structure.tag

Hope it helps in finding out what has changed in the different IDL versions,
Helder

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[Message index]

		Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 By: chris_torrence@NOSPAM on Thu, 21 February 2013 10:11
		Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 By: Lajos Foldy on Thu, 21 February 2013 08:44
		Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 By: markb77 on Thu, 21 February 2013 08:35
		Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 By: Helder Marchetto on Thu, 21 February 2013 07:58
		Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 By: markb77 on Thu, 21 February 2013 07:17
		Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 By: m_schellens on Thu, 21 February 2013 05:15
		Re: Storing data in an array inside a structure MUCH slower in IDL 8.2.2 By: Lajos Foldy on Thu, 21 February 2013 01:33

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