Trying to access correspondences from GICP

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Trying to access correspondences from GICP

I'm trying to access the correspondences coming out of GICP for that I inherited the GICP class like so:

template <typename PointSource, typename PointTarget>
class GeneralizedIterativeClosestPoint_Exposed
    : public pcl::GeneralizedIterativeClosestPoint<PointSource, PointTarget>
  pcl::CorrespondencesPtr getCorrespondencesPtr()
    return this->correspondences_;

but after inheriting this class now when I run the align function, the code hangs and gdb shows it stuck in
Eigen::Internal::Evaluator? Can someone tell me the correct way to access correspondences out of GICP as I need it to run LUM or some equivalent graph optimization.

Thank you.