boost派生对象的序列化不会调用derived的serialize()

Question

我已阅读了大量类似问题,但未找到答案.我正在使用Visual Studio 2010并提升1.47.

这是代码,它是完整的和可编译的:

#include "stdafx.h"

#include <string>
#include <sstream>

#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>

#include <boost/serialization/export.hpp>

using namespace std;

class BaseObject 
{
public:

    BaseObject(void) { };
    virtual ~BaseObject(void) { };

    template<class Archive>
      void serialize(Archive &ar, const unsigned int version)
      { /* nothing happens here */  };
};

class DerivedObject : public BaseObject
{
public:

    string text;

public:

    DerivedObject(void) { };
    ~DerivedObject(void) { };

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

BOOST_CLASS_EXPORT(DerivedObject)

int _tmain(int argc, _TCHAR* argv[])
{
    DerivedObject der;
    der.text = "Testing!";

    std::ostringstream os;
    boost::archive::text_oarchive oa(os);
    oa.register_type<DerivedObject>();

    // I made a DerivedObject, but I'm casting it to a BaseObject
    // as the serialization code should not have to know what type it is
    BaseObject *base = &der;
    // now serialize it
    oa << *base;

    printf("serialized: %s\r\n",os.str().c_str()); 

    return (0);
}

你可以看到它真的很简单,我已经添加了BOOST_CLASS_EXPORT和oa.register_type魔法,它应该确保DerivdObject :: serialize()被调用,即使它不是虚方法..但仍然只有serialize()in调用BaseObject.也许是Visual C++特有的问题？请指教？

Answer 1

正如boost 序列化文档中所述，您需要告诉派生类调用基类序列化代码。只需编写您的派生类序列化方法，如下所示：

  template<class Archive>
  void serialize(Archive &ar, const unsigned int version)
  {
      ar & boost::serialization::base_object<BaseObject>(*this);
      ar & text;
  };