3. 资源管理（条款：13-17）

#include <iostream>
using namespace std;
struct INT 
{
	int v;
	INT(int x) : v(x) { cout << "INT constructor called." << endl; }
	~INT() { cout << "INT deconstructor called." << endl; }
};
int main() 
{
	INT *tmp = new INT(6);
	cout << (*tmp).v << endl;
	cout << tmp->v << endl;
}

template<typename T> class Resource_ptr /* 加入管理类型 Resource_ptr */
{
public:
	Resource_ptr (T *p = NULL) : r_ptr(p) { cout << "Resource_ptr constructor called;" << endl; }
	~Resource_ptr () 
	{ 
		cout << "Resource_ptr deconstructor called; " << endl;
		if(r_ptr) delete r_ptr; 
	}

	const T& operator* () const { return *r_ptr; }
	T& operator* () { return *r_ptr; }

	const T* operator-> () const { return r_ptr; }
	T* operator-> () { return r_ptr; }

	/*T* get() { return r_ptr; }*/
private:
	T *r_ptr;
};

typedef Resource_ptr<INT> R_ptr;

int main() 
{
	/*INT *tmp = new INT(6);*/
	R_ptr tmp = R_ptr(new INT(6));
	cout << (*tmp).v << endl;
	cout << tmp->v << endl;
}