node.cc

资深C++讲师授课代码

#include <iostream>
using namespace std;

typedef int T;
struct Node{
	T data;
	Node* L;
	Node* R;
	Node(const T& d):data(d),L(0),R(0){++cnt;}
	static int cnt;
	~Node(){--cnt;}
};
int Node::cnt = 0;
int main()
{
	Node* p = new Node(5);
	Node* q = new Node(8);
	cout << Node::cnt << endl;
	delete p;
	cout << Node::cnt << endl;
	delete q;
	cout << Node::cnt << endl;
}