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

	template <typename Derived>
	void print_size(const EigenBase<Derived>& b)
	{
	std::cout << "size (rows, cols): " << b.size() << " (" << b.rows()
	<< ", " << b.cols() << ")" << std::endl;
	}

	int main()
	{
	Vector3f v;
	print_size(v);
	// v.asDiagonal() returns a 3x3 diagonal matrix pseudo-expression
	print_size(v.asDiagonal());
	}