C++如何通过Qt反射机制实现数据类序列化

// serializable.h
#ifndef SERIALIZABLE_H
#define SERIALIZABLE_H

#include "qjsonobject.h"

#include <QObject>
#include <QMetaObject>
#include <QMetaProperty>
#include <QDebug>
#include <QFile>

#include <QtWidgets/QMessageBox>

// SERIALIZE 宏内不能包含 Q_GADGET ，必须在子类中单独使用 Q_GADGET，
// 因为 moc 时不引入其它头文件，此处定义Q_GADGET对子类无效，子类不会生成moc文件
//const_cast<className&>(explicit
#define SERIALIZE(className) \
Q_CLASSINFO("base", "Serializable") \
public: \
className(const className &other){ \
    copy(other, *this); \
} \
inline const QMetaObject* getMetaInfo() const override{ \
    return &staticMetaObject; \
}

#ifndef Q_MOC_RUN
// define the tag text as empty, so the compiler doesn't see it
#  define JSON_FLAG
#endif
#define VAR_TYPE(var) decltype(var)

#ifdef CHAIN
#define SETTER(field, alias) \
inline auto set##alias(const __type_##field &value) { \
    field = value; \
return this; \
}
#else
#define SETTER(field, alias) \
inline void set##alias(const __type_##field &value) { \
    field = const_cast<__type_##field>(value); \
}
#endif

#define JSONFIELD(field, alias, ...) \
using __type_##field = decltype(field) ;\
Q_PROPERTY(__type_##field field READ get##alias WRITE set##alias) \
    public: \
    Q_INVOKABLE JSON_FLAG inline QMap<QString, QString> __get##alias##Info__(){ \
        QMap<QString, QString> info; \
        info["name"] = #field; \
        info["alias"] = #alias; \
        info["args"] = QString(#__VA_ARGS__); \
        return info; \
    } \
    inline __type_##field get##alias() const { return field; } \
    inline void set##alias(const __type_##field &value) { \
            field = value; \
    }

class Serializable
{
public:
    Serializable();
    virtual ~Serializable();
    static bool isSubClass(QMetaType type);
    virtual const QMetaObject* getMetaInfo() const = 0;
    void copy(const Serializable &from, Serializable &to);
    void copy(const Serializable &from);
    virtual QString hashCode();
    virtual bool equals(Serializable &obj);
    virtual bool operator==(Serializable &obj);
    virtual QString toString();
    template<typename T>
    T invokeMethod(const QMetaObject *metaInfo, int index);
    virtual QVariant getValue(QString fieldName);
    virtual void setValue(QString fieldName, QVariant value);

    friend QDataStream &operator<<(QDataStream &stream, const Serializable &data);
    friend QDataStream &operator>>(QDataStream &stream, Serializable &data);
    friend QDebug operator<<(QDebug dbg, const Serializable &data);

private:
    QString id;
};

Q_DECLARE_METATYPE(Serializable)

#endif // SERIALIZABLE_H

class Student : public Serializable
{
 Q_GADGET
 SERIALIZE(Student)
 public:
     Student();
     ~Student();
 private:
     QString name;
     int age;

     JSONFIELD(name, Name)
     JSONFIELD(age, Age)
};
Q_DECLARE_METATYPE(Cunstom)

Student student;
student.setName("li");
student.setAge(15);
qDebug() << student;
QByteArray array;
QDataStream stream(&array, QIODeviceBase::WriteOnly);
stream << student;