组合模式（Composite）

#include <list>
#include <iostream>
#include <string>
using namespace std;
class Component{
    protected:
        string name;
        public:
            virtual void Add(Component *file)=0;
            virtual void Remove(Component *file)=0;
            virtual list <Component *>* Get()=0;            
}; 
class Leaf:public Component{
    public:
        Leaf(string name)
        {
            this->name=name;
        }
        void Add(Component *file){
            cout<<"Cannot add to a leaf"<<endl;
        }
        void Remove(Component *file)
        {
            cout<<"Cannot remove from a leaf"<<endl;
        }
        list <Component *> * Get()
        {
            return NULL;
        }
};
class Composite:public Component{
    private:
        list <Component *> p;
    public:
        Composite(string name){
            this->name=name;
        }   
        void Add(Component *file){
            p.push_back(file);
        }
        void Remove(Component *file){
            p.remove(file);
        }
        list <Component *> * Get()
        {
            this->name;
        }
};
class manu:public Compsite{
//类似于dos命令下cd之类的进出命令使用  
};
int main(void)
{
   //略
    return 0;
}