模板类的继承

模板类的继承

模板类的继承包括四种：

1.（普通类继承模板类）

template<class T>
class TBase{
    T data;
……
};
class Derived:public TBase<int>{
……
};

2.（模板类继承了普通类（非常常见））

class TBase{
……
};
template<class T>
class TDerived:public TBase{
T data;
……
};

3.（类模板继承类模板）

template<class T>
class TBase{
T data1;
……
};
template<class T1,class T2>
class TDerived:public TBase<T1>{
T2 data2;
……
};

4.（模板类继承类模板，即继承模板参数给出的基类）

#include<iostream>
using namespace std;

class BaseA{
public:
    BaseA(){cout<<"BaseA founed"<<endl;}
};
class BaseB{
public:
    BaseB(){cout<<"BaseB founed"<<endl;}
};
template<typename T, int rows>
class BaseC{
private:
    T data;
public:
    BaseC():data(rows){
        cout<<"BaseC founed "<< data << endl;}
};
template<class T>
class Derived:public T{
public:
    Derived():T(){cout<<"Derived founed"<<endl;}
};

void main()
{
    Derived<BaseA> x;// BaseA作为基类
    Derived<BaseB> y;// BaseB作为基类
    Derived<BaseC<int, 3> > z; // BaseC<int,3>作为基类
}