Thank you for the reply.

This works!!! , but it creates a temporary. I was thinking how to cast the constness away, without making temporary object. I gess know at least I have one possible solution, althgough not complete happy with it :)

 

On 12/19/09, Steven Watanabe <watanabesj@gmail.com> wrote:

AMDG

elizabeta petreska wrote:

How to serialize shared_ptr member which points to const object.
The following compiles, but is not working i.e the restored
boost_shared_ptr  does not point to anything.
I tried to use const_pointer_cast to cast the const away. I suspect that
this is the problematic part.

I think the question here is , how should I cast away the const correctly
for boost::shared_ptr<const T>?
 

The problem is that you are creating a temporary when
you do the cast.  When you deserialize, the temporary
is modified, instead of mac.  The following seems to
work.

#include <boost/archive/xml_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/utility.hpp>
#include <fstream>
#include <boost/serialization/shared_ptr.hpp>

class B
{
public:
  B()  {  }
  B(int a):ma(a)  {  }

  int ma;

  template<class Archive>
  void serialize(Archive & ar, const unsigned int
      /*version*/)
  {
      using boost::serialization::make_nvp;
      ar & make_nvp("ma",ma);
  }
};

class BC
{
public:
  BC() { }
  BC(boost::shared_ptr<B>& t):mac(t) { }

  boost::shared_ptr<const B> mac;

  BOOST_SERIALIZATION_SPLIT_MEMBER()

  template<class Archive>
  void save(Archive & ar, const unsigned int /*version*/) const
  {
      using boost::serialization::make_nvp;
      ar & make_nvp("mac", mac);
  }
  template<class Archive>
  void load(Archive & ar, const unsigned int /*version*/)
  {
      using boost::serialization::make_nvp;
      boost::shared_ptr<B> temp;
      ar & make_nvp("mac", test);
      mac = temp;
  }
};

int main()
{
  std::ofstream ofs(L"C:\\MyTest.xml");
  std::ifstream ifs(L"C:\\MyTest.xml");

  boost::shared_ptr<B> bb(new B(4));

  BC aa(bb);

  {
      boost::archive::xml_oarchive oa(ofs);
      oa & BOOST_SERIALIZATION_NVP(aa);
  }

  BC raa;
  {
      boost::archive::xml_iarchive ia(ifs);
      ia & BOOST_SERIALIZATION_NVP(raa);
  }

}

In Christ,
Steven Watanabe

_______________________________________________
Boost-users mailing list
Boost-users@lists.boost.org
http://lists.boost.org/mailman/listinfo.cgi/boost-users