策略模式c++代码实现

// strategy.cpp : 定义控制台应用程序的入口点。
//

#include<iostream>
using namespace std;
class Strategy
{
public:
virtual void f()
{
cout << "Strategy::f" << endl;
}
};
class Context
{
public:
Context()
{
s = NULL;
}
void setStategy(Strategy *s)
{
this->s = s;
}
void f()
{
if(s)
{
s->f();
}
}
Strategy *s;
};
class ConcreteStrategy1:public Strategy
{
public:
virtual void f()
{
cout << "ConcreteStrategy1::f" << endl;
}

};
class ConcreteStrategy2:public Strategy
{
public:
virtual void f()
{
cout << "ConcreteStrategy2::f" << endl;
}

};

int main()
{
Context c;

ConcreteStrategy1 c1;
ConcreteStrategy2 c2;
c.setStategy(&c1);
c.f();
c.setStategy(&c2);
c.f();
return 0;
}