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Re: Destroying objects [message #82755 is a reply to message #37981]

Fri, 18 January 2013 10:07

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Friday, January 18, 2013 6:50:05 PM UTC+1, David Fanning wrote:
> Helder writes:
>
>
>
>> as usual I'm do things wrong believing I'm not until I wake-up.
>
>> So here's the thing. I'm using a structure to describe some objects. In my case these are regions of interest. Within this structure I have real objects. So that my structure looks something like this:
>
>>
>
>> MyStruct = {ROI_Structure, a:ID_Nr, b:SomeOtherParameter, c:Obj_new()}
>
>> I then fill in MyStruct.c by doing something like this:
>
>> XROI, MyImage, REGIONS_OUT = XROI_ObjRef
>
>> MyStruct.c = XROI_ObjRef
>
>>
>
>> The thing is that I then replicate this structure when I add new ROIs.
>
>> So I end up with say 10 {ROI_Structure} where for each element I did something like this:
>
>> for i=0,9 do MyStruct[i].c = XROI_ObjRef[i]
>
>>
>
>> If and when somewhere later in the program I want to delete object number 5... do I have to take care of using
>
>> Obj_destroy, MyStruct[5].c
>
>>
>
>> Is there no alternative?
>
>> Thing is, in this structure I have many pointers and objects...
>
>>
>
>> I'm I wrong in saying that I have to do the good-boy bookkeeping and free/destroy for each deleted structure element all pointers and objects?
>
>
>
> I'm not sure what the problem is, Helder. Doesn't this, do the job:
>
>
>
> Obj_Destroy, myStruct.c[*]
>
>
>
> Cheers,
>
>
>
> David
>
> --
>
> David Fanning, Ph.D.
>
> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")

Thank to both.
I think this is a general problem I'm realizing about programming. If you use structures that contain pointers or objects, that might contain other pointer and objects and so on, you have to take care of cleaning up the mess you've made.

Will have to do some housekeeping or trust 8.2.1 do to it for me.

Cheers,
Helder

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[Message index]

		Destroying objects By: Michael Wallace on Wed, 11 February 2004 14:26
		Re: Destroying objects By: JD Smith on Tue, 17 February 2004 12:30
		Re: Destroying objects By: David Fanning on Tue, 17 February 2004 13:19
		Re: Destroying objects By: David Fanning on Mon, 16 February 2004 14:06
		Re: Destroying objects By: JD Smith on Mon, 16 February 2004 13:11
		Re: Destroying objects By: David Fanning on Mon, 16 February 2004 13:22
		Re: Destroying objects By: Michael Wallace on Mon, 16 February 2004 12:46
		Re: Destroying objects By: JD Smith on Mon, 16 February 2004 11:55
		Re: Destroying objects By: David Fanning on Mon, 16 February 2004 10:18
		Re: Destroying objects By: David Fanning on Fri, 18 January 2013 10:23
		Re: Destroying objects By: Helder Marchetto on Fri, 18 January 2013 10:07
		Re: Destroying objects By: David Fanning on Fri, 18 January 2013 09:50
		Re: Destroying objects By: chris_torrence@NOSPAM on Fri, 18 January 2013 09:12

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