[Insight-users] Re: how to release the memory of a filter

[Andrew Li]

Hi, Karthik:

Your answers to Alb helped me too.
I have some additional questions:

What will happen if I do the following? (Assuming that TmpImage is also
a smart pointer)

>> ...
>>
>> itkFilter1->SetInput( InputImage );
>> itkFilter1->Update();
>> TmpImage = itkFilter1->GetOutput();
>>

InputImage = 0; // added as suggested by Karthik
itkFilter1 = 0; // added by Andrew #1

>> MyClassObject.SetInput( TmpImage );
>> OutputImage = MyClassObject.GetOutput();
>>

TmpImage = 0; // added by Andrew #2

>> ...
>>


Is there any advantage or problem from this inserted line? 
	itkFilter1 = 0; // added by Andrew #1
I assume that this line will force everything pointed by itkFilter1 to
be released except the object pointed by TmpImage. Is it correct?

And the remaining resources: the object pointed by TmpImage will be
release at inserted line #2: 
	TmpImage = 0; // added by Andrew #2
And, thus, there will be no problem such as memory leaks.
 
Thank you very much for your help!

-Andrew
 
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