[Insight-users] StopOptimization

[Luis Ibanez]

Hi Michael,


The error message that you posted seems to be originated by a
conflict in constness qualifications.

Note that Observers should implement two Execute() methods, one
"const" and another "non-const".  The StopOptimization() method is
non-const, so you can only invoke it from the non-const Execute()
method of the Observer.


The other calls are allowed in your const Execute() method, because
they are also const methods. (e.g. GetCurrentPosition() ).


Please try implementing a non-const Execute() method in your
observer and call StopOptimization from there.


Regards,


    Luis


----------------------
Michael Kuhn wrote:
> Hi,
> 
> When I'm trying to call optimizer->StopOptimization in my observer I get 
> the following compiler error:
> 
> D:\pack\vtkMy\src\Applications\Mixed\itkUtilities\quaternionObserverMultiResolution.cxx(49) 
> : error C2662: 'StopOptimization' : cannot convert 'this' pointer from 
> 'const class itk::QuaternionRigidTransformGradientDescentOptimizer' to 
> 'class itk::Gra
> dientDescentOptimizer &'
>        Conversion loses qualifiers
>        C:\programs\vs6p\VC98\INCLUDE\xstring(583) : while compiling 
> class-template member function 'void __thiscall 
> QuaternionObserverMultiResolution<class itk::RegistrationModule<class 
> itk::Image<short,3>,class itk::Image<short,3>,class itk::Image
> <short,3> > >::Execute(const class itk::Object *,const class 
> itk::EventObject &)'
> Error executing cl.exe.
> 
> In the execute method, I do a dynamic_cast from itk::Object caller to 
> itk::QuaternionRigidTransformGradientDescentOptimizer optimizer:
> 
>    OptimizerPointer optimizer = dynamic_cast<OptimizerPointer>(caller);
> 
> OptimizerPointer is defined as follows in the .h file of my observer:
> 
>    typedef itk::QuaternionRigidTransformGradientDescentOptimizer
>        OptimizerType;
>    typedef const OptimizerType* OptimizerPointer;
> 
> 
> 
> Other calls to this optimizer (like optimizer->GetCurrentPosition()) 
> work fine (i.e. the program compiles if I comment  the line that 
> contains optimizer->StopOptimization() ).
> 
> Can anybody tell me, what I'm doing wrong?
> 
> Thanks,
> 
> Michael
> 
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