Dutor

#include <iostream>
 
using namespace std;
 
class Base
{
public:
	void set(int n){m_data = n;}
	int get(){return m_data;}
private:
	int static m_data;
};
int Base::m_data = 0;
 
class Derived1: public Base{};
class Derived2: public Base{};
int 
main()
{
	Derived1 D1;
	Derived2 D2;
	D1.set(1);
	D2.set(2);
	cout<<D1.get()<<ends<<D2.get()<<endl;//~ 输出2 2
	return 0;
}

#include <iostream>
using namespace std;
 
template <class T>
class Base
{
public:
	void set(int n){m_data = n;}
	int get(){return m_data;}
private:
	int static m_data;
};
template <class T>
int Base<T>::m_data = 0;
 
class Derived1: public Base<Derived1>{};
class Derived2: public Base<Derived2>{};
int 
main()
{
	Derived1 D1;
	Derived2 D2;
	D1.set(1);
	D2.set(2);
	cout<<D1.get()<<ends<<D2.get()<<endl;//~ 输出1 2
	return 0;
}