log4cxx中的深层副本附加程序

我需要在log4cxx中深入复制一个appender,但是每个appender都有一个私有的copy构造函数和 operator= newInstance 创建同一类的默认实例。在这种情况下,如何替换long if instanceof语句?举个例子:

class FileAppender {
public:
    FileAppender();
    ~FileAppender();
    ...getter.....
    ...setter.....
protected:
    ....few variables....
private:
    FileAppender(const FileAppender& o);
    FileAppender& operator=(const FileAppender& o);
}

class RollingFileAppender: public FileAppender {
public:
    RollingFileAppender();
    ~RollingFileAppender();
    ...getter.....
    ...setter.....
protected:
    ....few variables....
private:
    RollingFileAppender(const RollingFileAppender& o);
    RollingFileAppender& operator=(const RollingFileAppender& o);
}

我现在拥有的:

if ((*it)->instanceof(RollingFileAppender::getStaticClass())) {
   //cast, create new instance and copy using getter and setter
} else if ((*it)->instanceof(FileAppender::getStaticClass())) {
   //cast, create new instance and copy using getter and setter
}
......and so on........