[Boost 1.56 Beta] [Serialization] Compilation problem with classes having special new operators

25 Jul 2014

      I was trying out the new Boost 1.56 beta and some of my serialization code
fails to compile (they work fine with previous versions of Boost e.g. Boost
1.55).

I am trying to do serialization of Eigen (http://eigen.tuxfamily.org/)
matrices with following code:

#include <Eigen/Core>
#include <fstream>
#include <boost/serialization/vector.hpp>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>

//Boost Serialization of Eigen Matrix
namespace boost {
  template<class Archive, typename _Scalar, int _Rows, int _Cols, int
_Options, int _MaxRows, int _MaxCols>
  inline void serialize(Archive & ar,
    Eigen::Matrix<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols>& t,
    const unsigned int file_version) {
    size_t rows = t.rows(), cols = t.cols();
    ar & rows;
    ar & cols;
    if (rows * cols != t.size())
      t.resize(rows, cols);
    ar & boost::serialization::make_array(t.data(), t.size());
  }
}

//Simple helper for serialization to a file
template <typename T>
bool serialize(const T& data, const std::string& filename) {
  std::ofstream ofs(filename.c_str(), std::ios::out | std::ios::binary);
  if (!ofs.is_open())
    return false;
  { // use scope to ensure archive goes out of scope before stream
    boost::archive::binary_oarchive oa(ofs);
    oa << data;
  }
  ofs.close();
  return true;
}

//Simple helper for de-serialization from a file
template <typename T>
bool deSerialize(T& data, const std::string& filename) {
  std::ifstream ifs(filename.c_str(), std::ios::in | std::ios::binary);
  if (!ifs.is_open())
    return false;
  { // use scope to ensure archive goes out of scope before stream
    boost::archive::binary_iarchive ia(ifs);
    ia >> data;
  }
  ifs.close();
  return true;
}

int main(int argc, char *argv[]) {
  typedef Eigen::Vector3d VectorType;
  VectorType* vec = new VectorType(1, 2, 3);
  serialize(vec, "v4d.dat");
  std::cout << "v4d =\n" << *vec << std::endl;

  VectorType* vec_in;
  deSerialize(vec_in, "v4d.dat");
  std::cout << "v4d_in =\n" << *vec_in << std::endl;
  return 0;
}

The error in Visual studio 2013 says:

boost/archive/detail/iserializer.hpp(237): error C2665:
'Eigen::PlainObjectBase<Eigen::Matrix<double,3,1,0,3,1>>::operator delete'
: none of the 3 overloads could convert all the argument types
2>
 c:\users\abhijit\codes\installs\eigen\eigen-install\include\eigen3\eigen\src/Core/PlainObjectBase.h(132):
could be 'void
Eigen::PlainObjectBase<Eigen::Matrix<double,3,1,0,3,1>>::operator
delete(void *,const std::nothrow_t &) throw()'
2>
 c:\users\abhijit\codes\installs\eigen\eigen-install\include\eigen3\eigen\src/Core/PlainObjectBase.h(132):
or       'void
Eigen::PlainObjectBase<Eigen::Matrix<double,3,1,0,3,1>>::operator
delete(void *,void *) throw()'
2>          while trying to match the argument list '(VectorType *, size_t)'
2>
 C:\Boost\boost-1_56_0_b1\boost/archive/detail/iserializer.hpp(224) : while
compiling class template member function 'void
boost::archive::detail::heap_allocation<T>::has_new_operator::invoke_delete(T
*)'

There is also the following note, but I cannot seem to understand this.

// if compilation fails here, the likely cause that the class
// T has a class specific new operator but no class specific
// delete operator which matches the following signature.  Fix
// your program to have this.  Note that adding operator delete
// with only one parameter doesn't seem correct to me since
// the standard(3.7.4.2) says "
// "If a class T has a member deallocation function named
// 'operator delete' with exactly one parameter, then that function
// is a usual (non-placement) deallocation function" which I take
// to mean that it will call the destructor of type T which we don't
// want to do here.

I want to understand this issue because this breaks a lot of existing code.

Hijok Payne

Hijok Payne

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