Re: [Boost-users] Vector of Polymorphic Pointers

From: Robert Ramey (ramey_at_[hidden])
Date: 2006-05-01 17:40:56

Hmmm - it looks like ASTNode might not be polymorphic - it doesn't seem 
tohave a virtual function defined.

Try the following change:
"Juan Quiroz" <juancq_at_[hidden]> wrote in message 
news:f4e027970605011410p207777c1m1abef4f5771acc07_at_mail.gmail.com...

I am trying to serialize a vector of polymorphic pointers.  My code looks as 
follows:

class ASTNode{
...
protected:
vector <ASTNode*> children;
string name;
string type;

private:
   // Code for serialization
        friend class boost::serialization::access;
        template<class Archive>
        void serialize(Archive & ar, unsigned int version)
        {
            ar & name;
            ar & type;
            ar & children;
        }
        virtual ~ASTNode(); // <== try adding this in!
}
class ASTNode2: public ASTNode{
...
private:
  // Code for serialization
        friend class boost::serialization::access;
        template<class Archive>
            void serialize(Archive & ar, unsigned int version)
            {
                // serialize base class information
                ar & boost::serialization::base_object<ASTNode>(*this);
            }
        // End code for serialization
}

I use the vector "children" to hold pointers to both base and derived 
objects.  I have tried registering the derived classes at the top of the 
serialize function call, with the use of 
ar.register(static_cast<ASTNode*>(NULL)).  I have also tried using the 
BOOST_CLASS_EXPORT_GUID macro to register the classes in main.  Yet, I still 
get a unregistered class exception.  Any guidance would be greatly 
appreciated.

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