C++运行时类型识别（RTTI）

    #include<iostream>
    #include<string>
    #include<vector>
    #include<map>
    #include<typeinfo>
    
    
    using namespace std;
    
    
    class Base {
    	friend bool operator==(const Base&, const Base&);
    public:
    protected:
    	virtual bool equal(const Base&) const;
    
    };
    
    
    class Derived :public Base
    {
    public:
    	string mem;
    
    protected:
    	bool equal(const Base&) const;
    };
    
    bool Derived::equal(const Base& rhs) const
    {
    	try
    	{
    		auto r = dynamic_cast<const Derived&>(rhs);
    		if (this->mem == r.me