problem about boost::serialization library

breadbread1984 (48)
i am using boost serialization library. I have a child class deriving from parent class. Both classes have their serialization function. When I want to hold a child class object through a parent class ptr and want to write it to a file, the parent serialization function is called instead of child class's serialization function. how to solve the problem?
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#include <iostream>
#include <fstream>
#include <boost/shared_ptr.hpp>
#include <boost/filesystem.hpp>
#include <boost/serialization/version.hpp>
#include <boost/serialization/split_member.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>

using namespace std;
using boost::shared_ptr;
using namespace boost::filesystem;
using namespace boost::archive;

class Parent {
	friend class boost::serialization::access;
	template<class Archive> void save(Archive & ar,const unsigned int version) const;
	template<class Archive> void load(Archive & ar,const unsigned int version);
	BOOST_SERIALIZATION_SPLIT_MEMBER()
public:
	Parent();
	virtual ~Parent() = 0;
};

Parent::Parent() {cout<<"Parent()"<<endl;}
Parent::~Parent() {cout<<"~Parent()"<<endl;}
template<class Archive>
void Parent::save(Archive & ar,const unsigned int version) const {cout<<"Parent::save"<<endl;}
template<class Archive>
void Parent::load(Archive & ar,const unsigned int version) {cout<<"Parent::load"<<endl;}

class Child : public Parent {
	friend class boost::serialization::access;
	template<class Archive> void save(Archive & ar,const unsigned int version) const;
	template<class Archive> void load(Archive & ar,const unsigned int version);
	BOOST_SERIALIZATION_SPLIT_MEMBER()
public:
	Child() {cout<<"Child()"<<endl;}
	~Child() {cout<<"~Child()"<<endl;}
};

template<class Archive>
void Child::save(Archive & ar,const unsigned int version) const {cout<<"Child::save"<<endl;}
template<class Archive>
void Child::load(Archive & ar,const unsigned int version) {cout<<"Child::load"<<endl;}

int main()
{
	shared_ptr<Parent> p(new Child());
	ofstream out("test.txt");
	text_oarchive ofs(out);
	ofs << *p;
}

you can compile the program through
g++ test.cpp -lboost_filesystem -lboost_serialization

the output of the program is
Parent()
Child()
Parent::save
~Child()
~Parent()
Last edited on
coder777 (8450)
Your save() and load() functions must be virtual (at least in your class Parent).
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