【C++】纯虚函数的简略应用

【C++】纯虚函数的简单应用。

//纯虚函数的简单应用。
#include<iostream>
using namespace std;
class A
{
public:
	virtual void Eat() = 0;
	virtual void Sleep() = 0;
	virtual void Foot() = 0;
};

class P : public A
{
public:
	void Eat()
	{
		cout<<"P::Eat()"<<endl;
	}
	void Sleep()
	{
		cout<<"P::Sleep()"<<endl;
	}
	void Foot()
	{
		cout<<"P::Foot()"<<endl;
	}
};

class B : public A
{
public:
	void Eat()
	{
		cout<<"B::Eat()"<<endl;
	}
	void Sleep()
	{
		cout<<"B::Sleep()"<<endl;
	}
	void Foot()
	{
		cout<<"B::Foot()"<<endl;
	}
	virtual void Fly() = 0;
};

class T : public B
{
public:
private:
	void Fly()
	{}
};

void main()
{
	P p;
	p.Eat();
	p.Foot();
	p.Sleep();
	T t;
	t.Eat();
	t.Foot();
//	t.Fly();   //在T中，Fly属于私有，不能实现
}
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