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具有命名空间基的派生类的Boost序列化无效xml标记

boost-serialization namespaces boost xml

etjazz · 技术社区 · 12 年前

如果我遇到如下情况,其中类B是从不同命名空间中的类a派生的,那么序列化oputput无法验证基类的标记名,从而产生“无效的XML标记名”。

我该如何处理这种情况?

#include <boost/archive/xml_oarchive.hpp>
#include <boost/serialization/base_object.hpp>

namespace N {

struct A
{
    friend class boost::serialization::access;
    int m_a;

    template<class Archive>
    void serialize(Archive & ar, const unsigned int version)
    {
        ar & BOOST_SERIALIZATION_NVP(m_a);
    }
};

}



struct B : N::A
{
    friend class boost::serialization::access;

    template<class Archive>
    void serialize(Archive & ar, const unsigned int version)
    {
        ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(N::A);
    }
};



int main ()
{
    B b;
    boost::archive::xml_oarchive ar(std::cout);
    ar << BOOST_SERIALIZATION_NVP(b);
}

输出为:

 <?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE boost_serialization>
<boost_serialization signature="serialization::archive" version="9">
<b class_id="0" tracking_level="0" version="0"terminate called after throwing an instance of 'boost::archive::xml_archive_exception'
  what():  Invalid XML tag name
The program has unexpectedly finished.