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Singleton.cpp
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103 lines (52 loc) · 1.03 KB
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#include<iostream>
using namespace std;
class Singleton
{
private:
Singleton();//注意:构造方法私有
virtual ~Singleton();
static Singleton *instance;//惟一实例
int var;
public:
static Singleton *GetInstance();//工厂方法(用来获得实例)
int getVar();
void setVar(int);
};
Singleton::Singleton() //构造方法实现
{
this->var=20;
cout<<"Singleton Constructor"<<endl;
}
Singleton::~Singleton()
{
if(instance!=NULL)
{
delete instance;
}
}
Singleton *Singleton::instance=NULL;//初始化静态成员
Singleton *Singleton::GetInstance()
{
if(instance==NULL)
{
instance=new Singleton();
}
return instance;
}
int Singleton::getVar()
{
return(this->var);
}
void Singleton::setVar(int var)
{
this->var=var;
}
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;
}