如何boost::serialize指针和引用？

#include <iostream>
#include <fstream>
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/serialization/serialization.hpp>
#include <boost/serialization/export.hpp>

class MyClass {
public:
    int x;
    MyClass(int x) : x(x) {}
    MyClass() {}
};

// 序列化和反序列化指针
template<class Archive>
void serialize(Archive& ar, MyClass*& obj, const unsigned int version) {
    ar & obj;
}

// 序列化和反序列化引用
template<class Archive>
void serialize(Archive& ar, MyClass& obj, const unsigned int version) {
    ar & boost::serialization::make_nvp("x", obj.x);
}

int main() {
    MyClass* pObj = new MyClass(42);
    MyClass& refObj = *pObj;

    // 序列化
    std::ofstream ofs("data.txt");
    boost::archive::text_oarchive oa(ofs);
    oa & pObj;
    oa & refObj;
    ofs.close();

    // 反序列化
    std::ifstream ifs("data.txt");
    boost::archive::text_iarchive ia(ifs);
    MyClass* pDeserializedObj;
    MyClass deserializedRefObj;
    ia & pDeserializedObj;
    ia & deserializedRefObj;
    ifs.close();

    std::cout << "Deserialized pointer value: " << pDeserializedObj->x << std::endl;
    std::cout << "Deserialized reference value: " << deserializedRefObj.x << std::endl;

    delete pObj;

    return 0;
}