sigleton

#pragma once

class Singleton
{
public:
 virtual ~Singleton(){}
 static Singleton* GetInstance(int num);
 void mysingle()
 {
  cout<<"my data\t"< }
protected:
 Singleton(int num)
 {
  m_inum = num;
 }
private:
 int m_inum;
 static Singleton* m_single;
};

Singleton* Singleton::m_single = NULL;

Singleton* Singleton::GetInstance(int num)
{
 if (m_single == NULL)
 {
  m_single = new Singleton(num);
 }
 return m_single;
}

/****************************************************************/

#include

using namespace std;

 Singleton* single1 = Singleton::GetInstance(10);
 single1->mysingle();
 Singleton* single = Singleton::GetInstance(5);
 single->mysingle();