#include <iostream>
#include <string.h>

using namespace std;

#include <iostream>
using namespace std;
class A {
private:
	char* m_s;	
public:
	
	A() {
		m_s = strdup("default");
		cout << "A()" << endl;
	}
	A(const char* s) {
		cout << "A(char)" << endl; m_s = strdup(s);
	}
	virtual void prepare() { cout << "A "; }
	void display() {
		prepare();
		cout << m_s << endl;
	}
	virtual ~A() {
		cout << "A::~A()" << endl;;
		delete[]m_s;
	}
};
class B : public A {
public:
	B(const char* s) : A(s) { cout << "B(char)" << endl; }
	B(const B& b) { cout << "B(B)" << endl; }
	void prepare() { cout << "B "; }
	~B() {
		cout << "B::~B" << endl;
	}
};
void foo(A* obj1, A obj2) {
	obj1->display();
	obj2.display();
}
int main() {
	B obj1("text");
	A* obj2 = new B(obj1);
	foo(&obj1, *obj2);
	//delete obj2;
	
	return 0;
}