[eigen] Matrix::RowXpr::Nested is a reference...

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Is that correct as is?

In the following case


it means that it fails since matrix.row(0) returns a temporary to which a reference is stored in Replicate.

I used this piece of code to verify my assumption:

#include "Eigen/Core"

#include "boost/type_traits/is_reference.hpp"

void main()
  typedef Eigen::MatrixXd::RowXpr::Nested type;

  std::cout << typeid(type).name();
  if (boost::is_reference<type>::type::value == true) std::cout << "&";
  std::cout << std::endl;


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