我正在尝试构建一个树状结构来进行由一系列问题组成的测试。
这个想法是 Test、Question、QuestionPart 都将派生自以下类:
class Node
{
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & boost::serialization::make_nvp("children", m_children);
ar & boost::serialization::make_nvp("intro", m_intro);
}
public:
Node(){};
virtual ~Node(){};
virtual void addChildNode( Node* _child );
virtual const std::string getIntro() const;
virtual Node* getChild( const _index ) const;
virtual void setIntro( std::string _intro );
protected:
std::vector<Node*> m_children;
std::string m_intro;
};
在做所有其他课程之前,我尝试了以下内容:
void saveTest( const Node &test, const char* filename)
{
// make an archive
std::ofstream ofs(filename);
boost::archive::xml_oarchive oa(ofs);
oa << BOOST_SERIALIZATION_NVP(test);
}
void createTest()
{
Node* test = new Node();
Node* question1 = new Node();
question1->setIntro("Question 1");
test->addChildNode(question1);
test->setIntro("Test");
saveTest( *test, fileLocation.c_str() );
}
但这会引发异常,并且只会创建以下内容:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE boost_serialization>
<boost_serialization signature="serialization::archive" version="10">
<test class_id="0" tracking_level="1" version="0" object_id="_0">
<children class_id_reference="0" object_id="_1">
<children</boost_serialization>
任何见解将不胜感激。