Hello

I am trying to get the following behaviour with EIGEN:

I want a function like:

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template<typename Derived, int N>
void func( Matrix<Derived, 6 , N > & A)

I want that only Structures with a size 6xN can be supplied to the function.
But how can this work with expressions for example:

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func(  B.block<6,10>(0,0) )   

I dont want a general template for all structures like

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template<typename Derived>
void func( MatrixBase<Derived> & A)

Do I have to specialise the same function for Block and VectorBlock as well? So 3 overloads?

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template<typename Derived, int N>
void func( Block<Derived, 6 , N > & A) ;
void func( VectorBlock<Derived, 6 , N > & A) ;


What is the ellegant and correct solution?

Thanks for your help!!

write a generic function for MatrixBase<> or even DenseBase<> objects, an then use a static assertion:

EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(Derived,6)

This is what we do in Eigen.

Another solution is to use the enable_if mechanism of boost.

Thanks alot!

Helped alot!