eigen_serialization_addon.hpp

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// the following code comes from
// https://stackoverflow.com/questions/18382457/eigen-and-boostserialize
// and adds support for serialization of Eigen types
//
// question asked by user Gabriel and answered by iNFINITEi
//
// answer code repeated here verbatim.
// please update this comment if this code is changed,
// and post the modifications to the above referenced post on SO.
 
 

 
#ifndef EIGEN_SERIALIZATION_ADDON_HPP
#define EIGEN_SERIALIZATION_ADDON_HPP
 
#pragma once

// This file is an Eigen plugin fragment: its contents are injected into the body
// of Eigen::DenseBase, so the members below have no enclosing class of their own
// here.  Hidden from Doxygen, which would otherwise fail to resolve them.
 
friend class boost::serialization::access;
template<class Archive>
void save(Archive & ar, const unsigned int /*version*/) const {
  derived().eval();
  const Eigen::Index rows = derived().rows(), cols = derived().cols();
  ar & rows;
  ar & cols;
  for (Index j = 0; j < cols; ++j )
    for (Index i = 0; i < rows; ++i )
      ar & derived().coeff(i, j);
}
 
template<class Archive>
void load(Archive & ar, const unsigned int /*version*/) {
  Eigen::Index rows, cols;
  ar & rows;
  ar & cols;
  if (rows != derived().rows() || cols != derived().cols() )
    derived().resize(rows, cols);
  ar & boost::serialization::make_array(derived().data(), derived().size());
}
 
template<class Archive>
void serialize(Archive & ar, const unsigned int file_version) {
  boost::serialization::split_member(ar, *this, file_version);
}
 
#endif // EIGEN_SERIALIZATION_ADDON_HPP