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#include <Eigen/Core.h>
USING_PART_OF_NAMESPACE_EIGEN
using namespace std;
template<typename Scalar, typename Derived>
Eigen::Row<Derived>
firstRow(MatrixBase<Scalar, Derived>& m)
{
return m.row(0);
}
int main(int, char**)
{
Matrix4d m = Matrix4d::identity();
cout << firstRow(m) << endl;
firstRow(m) *= 5;
cout << "Now the matrix m is:" << endl << m << endl;
return 0;
}
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