C++单例

#include <iostream>
using namespace std;
//单例类的C++实现

class Singleton
{
private:
Singleton();//注意:构造方法私有
virtual ~Singleton();
static Singleton* instance;//惟一实例
int var;//成员变量(用于测试)

public:
   static Singleton* GetInstance();//工厂方法(用来获得实例)
   int getVar();//获得var的值
   void setVar(int);//设置var的值
};
//构造方法实现
Singleton::Singleton()
{
   this->var = 20;
   cout<<"Singleton Constructor"<<endl;
}
Singleton::~Singleton()
{
   delete instance;
}
//初始化静态成员
Singleton* Singleton::instance=new Singleton();
Singleton* Singleton::GetInstance()
{
   return instance;
}
//seter && getter含数
int Singleton::getVar()
{
   return this->var;
}
void Singleton::setVar(int var)
{
   this->var = var;
}
//main

int main(int argc, char* argv[])
{
   Singleton *ton1 = Singleton::GetInstance();
   Singleton *ton2 = Singleton::GetInstance();
   cout<<"ton1 var = "<<ton1->getVar()<<endl;
   ton1->setVar(150);
   cout<<"ton2 var = "<<ton2->getVar()<<endl;
   return 0;
}



运行结果:
Singleton Constructor
ton1 var = 20
ton2 var = 150