纯虚函数之析构函数

纯虚函数可以有函数体（可以有但最好不要加）。当基类析构函数为纯虚函数时，必须显示加上函数体。

#include <iostream>
using namespace std;

class Base
{
public:
	virtual void print() =0;

	virtual void print1() = 0
	{
		cout<< "Base print1" <<endl;
	}

	virtual ~Base() = 0
	{
		cout<< "~Base" <<endl;
	}
};



class Deriver:public Base
{
public:
	void print()
	{
		cout<< "Deriver print" <<endl;
	}

	void print1()
	{
		cout<< "Deriver print1" <<endl;
	}

	~Deriver()
	{
		cout<< "~Deriver" <<endl;
	}
};

void main()
{
	Deriver d;
	
	d.print();
	//d.Base::print();//error

	d.print1();
	d.Base::print1();
}