class_VectorBlock.cpp
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	#include <Eigen/Core>
	#include <iostream>
	using namespace Eigen;
	using namespace std;

	template<typename Derived>
	Eigen::VectorBlock<Derived>
	segmentFromRange(MatrixBase<Derived>& v, int start, int end)
	{
	return Eigen::VectorBlock<Derived>(v.derived(), start, end-start);
	}

	template<typename Derived>
	const Eigen::VectorBlock<const Derived>
	segmentFromRange(const MatrixBase<Derived>& v, int start, int end)
	{
	return Eigen::VectorBlock<const Derived>(v.derived(), start, end-start);
	}

	int main(int, char**)
	{
	Matrix<int,1,6> v; v << 1,2,3,4,5,6;
	cout << segmentFromRange(2*v, 2, 4) << endl; // calls the const version
	segmentFromRange(v, 1, 3) *= 5; // calls the non-const version
	cout << "Now the vector v is:" << endl << v << endl;
	return 0;
	}