[Insight-users] C2440 when reinterpret_cast-ing from base to specific class

[itkvtk123 at gmx.net]

Hello itk users!

Today I encountered a very simple problem but I could not find out what I'm doing wrong.
I want to convert a base class object to the specific class, but it does not seem to work.

I'm getting
"error C2440: 'reinterpret_cast' : cannot convert from 'itk::SingleValuedNonLinearOptimizer::Pointer' to 'itk::RegularStepGradientDescentOptimizer::Pointer"


Minimal Code:

///////////////////////////////////////////////////////////////////////////////////////////

#include "itkSingleValuedNonLinearOptimizer.h"
#include "itkRegularStepGradientDescentOptimizer.h"

int main()
{
	typedef itk::SingleValuedNonLinearOptimizer OptimizerType;
	typedef itk::RegularStepGradientDescentOptimizer GradientDescentType;

	OptimizerType::Pointer optimizer = GradientDescentType::New();

	reinterpret_cast<GradientDescentType::Pointer>(optimizer)->SetRelaxationFactor(0.5);

	return 0;
}

///////////////////////////////////////////////////////////////////////////////////////////


Since RegularStepGradientDescentOptimizer is a child class from SingleValuedNonLinearOptimizer, I do not understand why this conversion does not work.

Any help appreciated!
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