class_VectorBlock.cpp
68bb631292e1master

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;
			}