组合模式（Composite）

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1.目的

有的需要将对象组织成树形结构，分为枝节点和叶节点，枝节点持有叶节点，同时需要枝节点和叶节点具有相同的行为（对外暴露同样的接口）

2.代码

composite.h

#ifndef COMPOSITE_H_#define COMPOSITE_H_#include <list>#include <string>#include <iostream>using namespace std;class Component{public:Component(string arg):name(arg){}virtual ~Component(){}virtual void add(Component&)=0;virtual void del(Component&)=0;virtual void display()=0;protected:string name;};class Composite: public Component{public:Composite(string arg):Component(arg){}void add(Component& arg){lists.push_back(&arg);}void del(Component& arg){lists.remove(&arg);}void display(){cout<<"--"<<name<<endl;list<Component*>::iterator iter = lists.begin();while(iter != lists.end()){(*iter)->display();iter++;}}private:list<Component*> lists;};class Leaf: public Component{public:Leaf(string arg):Component(arg){}void add(Component& arg){cout<<"can not call this "<<endl;}void del(Component& arg){cout<<"can not call this "<<endl;}void display(){cout<<"----"<<name<<endl;}};#endif /* COMPOSITE_H_ */

composite.cpp

#include "Composite.h"void composite(){Composite root("root");Composite level1("level1");Leaf leaf11("Leaf11");Leaf leaf12("Leaf12");Composite level2("level2");Leaf leaf21("Leaf21");Leaf leaf22("Leaf22");Leaf leaf23("Leaf23");level2.add(leaf21);level2.add(leaf22);level2.add(leaf23);level1.add(leaf11);level1.add(leaf12);root.add(level1);root.add(level2);root.display();}

执行结果：

--root
--level1
----Leaf11
----Leaf12
--level2
----Leaf21
----Leaf22
----Leaf23

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