class_FixedReshaped.cpp

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#include <Eigen/Core>
#include <iostream>
 
template<typename Derived>
Eigen::Reshaped<Derived, 4, 2>
reshape_helper(Eigen::MatrixBase<Derived>& m)
{
  return Eigen::Reshaped<Derived, 4, 2>(m.derived());
}
 
int main(int, char**)
{
  Eigen::MatrixXd m(2, 4);
  m << 1, 2, 3, 4,
       5, 6, 7, 8;
  Eigen::MatrixXd n = reshape_helper(m);
  std::cout << "matrix m is:" << std::endl << m << std::endl;
  std::cout << "matrix n is:" << std::endl << n << std::endl;
  return 0;
}