singleton.cc

day77_1187669327.zip

#include <iostream>
using namespace std;

class Single{
	int data;
	Single(){}
	Single(const Single& o){}
	//static int s;
	static Single obj;
public:
	static Single& getInstance(){
		return obj;
	}
	void set(int d){
		data = d;
	}
	void show(){
		cout << "this=" << this << ", ";
		cout << "data=" << data << endl;
	}
};
//int Single::s;
Single Single::obj;
int main()
{
	Single& s1=Single::getInstance();
	Single& s2=Single::getInstance();
	s1.set(100);
	s1.show();
	s2.show();
	//Single s3;//ERROR!!
	//Single s4(s1);//ERROR!!
	//Single s5=s1;//ERROR!!
}