TemplateKeyword_flexible.cpp
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	#include <Eigen/Dense>
	#include <iostream>

	using namespace Eigen;

	template <typename Derived1, typename Derived2>
	void copyUpperTriangularPart(MatrixBase<Derived1>& dst, const MatrixBase<Derived2>& src)
	{
	/* Note the 'template' keywords in the following line! */
	dst.template triangularView<Upper>() = src.template triangularView<Upper>();
	}

	int main()
	{
	MatrixXi m1 = MatrixXi::Ones(5,5);
	MatrixXi m2 = MatrixXi::Random(4,4);
	std::cout << "m2 before copy:" << std::endl;
	std::cout << m2 << std::endl << std::endl;
	copyUpperTriangularPart(m2, m1.topLeftCorner(4,4));
	std::cout << "m2 after copy:" << std::endl;
	std::cout << m2 << std::endl << std::endl;
	}