boost::serialization(2)序列化基类

在派生类中序列化一个基类

假如有一个基类如下：

class student_info
{
public:
	student_info() {}
	virtual ~student_info() {}
	student_info(const std::string& sn, const std::string& snm, const std::string& sg)
		: name_(sn), number_(snm), grade_(sg)
	{
	}

	virtual void print_info() const
	{
		std::cout << name_ << " " << number_ << " " << grade_ << std::endl;
	}

private:
	std::string name_;
	std::string number_;
	std::string grade_;
};
           

它的一个派生类如下：

class middle_student : public student_info
{
public:
	middle_student() {}
	virtual ~middle_student() {}
	middle_student(const std::string& sn, const std::string& snm, const std::string& sg, int age)
		: student_info(sn, snm, sg), age_(age)
	{

	}

	virtual void print_info()
	{
		student_info::print_info();
		std::cout << age_ << std::endl;
	}
private:
	int age_;
};
           

我们如何在序列化派生类的同时序列化基类？

boost::serialization提供一个base_object的模板发现来

解决这个问题，我们只需要在派生类的序列化代码中使用这个方法即可。

代码如下：

private:
	friend class boost::serialization::access;
	template<typename Archive>
	void serialize(Archive& ar, const unsigned int version)
	{
		ar & boost::serialization::base_object<student_info>(*this);//使用基类的序列化
		ar & BOOST_SERIALIZATION_NVP(age_);
	}
           

记住需要包含头文件 <boost/serialization/base_object.hpp>，这样就解决问题了

完整代码如下：

class student_info
{
public:
	student_info() {}
	virtual ~student_info() {}
	student_info(const std::string& sn, const std::string& snm, const std::string& sg)
		: name_(sn), number_(snm), grade_(sg)
	{
	}

	virtual void print_info() const
	{
		std::cout << name_ << " " << number_ << " " << grade_ << std::endl;
	}

private:
	friend class boost::serialization::access;
	template<typename Archive>
	void serialize(Archive& ar, const unsigned int version)
	{
		ar & BOOST_SERIALIZATION_NVP(name_);
		ar & BOOST_SERIALIZATION_NVP(number_);
		ar & BOOST_SERIALIZATION_NVP(grade_);
	}

private:
	std::string name_;
	std::string number_;
	std::string grade_;
};

class middle_student : public student_info
{
public:
	middle_student() {}
	virtual ~middle_student() {}
	middle_student(const std::string& sn, const std::string& snm, const std::string& sg, int age)
		: student_info(sn, snm, sg), age_(age)
	{

	}

	virtual void print_info()
	{
		student_info::print_info();
		std::cout << age_ << std::endl;
	}

private:
	friend class boost::serialization::access;
	template<typename Archive>
	void serialize(Archive& ar, const unsigned int version)
	{
		ar & boost::serialization::base_object<student_info>(*this);
		ar & BOOST_SERIALIZATION_NVP(age_);
	}

private:
	int age_;
};