派生类行程的序列化Boost断言

Serialization of derived class trips Boost assertion

本文关键字：序列化 Boost 断言 派生      更新时间：2023-10-16

当尝试用boost::serialization序列化派生类时，boost/archive/detail/oserializer.hpp中的断言(Boost 1.53.0中的第436行)被触发:

const basic_pointer_oserializer * bpos
    = static_cast<const basic_pointer_oserializer *>(
        boost::serialization::singleton<
            archive_serializer_map<Archive>
        >::get_const_instance().find(*true_type)
    );
BOOST_ASSERT(NULL != bpos);

这是我的MWE:

#include <iostream>
#include <fstream>
#include <boost/archive/polymorphic_xml_oarchive.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/access.hpp>
#include <boost/serialization/base_object.hpp>
class base
{
    friend class boost::serialization::access;
    template <class Archive>
    void serialize(Archive &ar, const unsigned int version)
    {
        ar & boost::serialization::make_nvp("test", test);
    }
    int test;
public:
    virtual void print() { std::cout << 1 << std::endl; }
};
class derived : public base
{
    friend class boost::serialization::access;
    template <class Archive>
    void serialize(Archive &ar, const unsigned int version)
    {
        ar & boost::serialization::make_nvp("base", boost::serialization::base_object<base>(*this));
        ar & boost::serialization::make_nvp("test2", test2);
    }
    int test2;
public:
    void print() { std::cout << 2 << std::endl; }
};
int main (int argc, char const *argv[])
{
    base *b = new derived();
    std::ofstream stream("out.xml");
    boost::archive::polymorphic_xml_oarchive ar(stream);
    ar.register_type<derived>();
    ar << boost::serialization::make_nvp("b", b);
    return 0;
}

我还尝试使用BOOST_CLASS_EXPORT_GUID而不是register_type，但这也不起作用。知道我哪里做错了吗?

您可能并不打算使用多态xml_archive(参见文档)。

值得注意的是，多态归档必须与归档的接口有关，与您要序列化的实体无关(它们总是可以是多态的)。

如果使用xml_archive，问题就消失了。

相关文章：