设计模式学习--组合模式，c++代码

下面是组合模式的UML类图：

 

 

<span style="font-family:Microsoft YaHei;font-size:18px;"><span style="font-family:Microsoft YaHei;font-size:18px;">//composite.h#ifndef _COMPOSITE_H_#define _COMPOSITE_H_#include <vector>using namespace std;/*Component 抽象基类，为组合中的对象声明接口，声明了类共有接口的缺省行为（如这里的Add，Remove,GetChild函数），声明一个接口函数可以访问Component的子组件*/class Component{public://纯虚函数，只提供接口，没有默认实现virtual void Operation() = 0;// 虚函数，提供接口，有默认的实现就是什么都不做virtual void Add(Component* com);virtual void Remove(Component* com);virtual Component* GetChild(int index);virtual ~Component();protected:Component();private:};//Leaf是叶子节点，也就是不含有子组件的节点类，所以不用实现Add，Remove，GetChild等方法class Leaf:public Component{public://只实现Operation接口virtual void Operation();Leaf();~Leaf();protected:private:};//Composite:含有子组件的类class Composite:public Component{public:Composite();~Composite();//实现所有接口void Operation();void Add(Component* com);void Remove(Component* com);Component* GetChild(int index);protected:private:vector<Component* >m_ComVec;};#endif</span></span>

 

 

<span style="font-family:Microsoft YaHei;font-size:18px;">//composite.cpp// composite.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include "composite.h"#include <iostream>#include <vector>using namespace std;Component::Component(){}Component::~Component(){}void Component::Add(Component* com){cout<<"Add"<<endl;}void Component::Remove(Component* com){}void Component::Operation(){cout<<"Component::Operarion"<<endl;}Component* Component::GetChild(int index){return NULL;}Leaf::Leaf(){}Leaf::~Leaf(){}void Leaf::Operation(){cout<<"Leaf::Operation"<<endl;}Composite::Composite(){}Composite::~Composite(){}void Composite::Add(Component* com){this->m_ComVec.push_back(com);}void Composite::Remove(Component* com){vector<Component* >::iterator iter = this->m_ComVec.begin();while (iter!=this->m_ComVec.end()){if (*iter == com){iter = this->m_ComVec.erase(iter);}}//this->m_ComVec.erase(com);}void Composite::Operation(){cout<<"Composite::Operation"<<endl;vector<Component*>::iterator iter = this->m_ComVec.begin();for (;iter!= this->m_ComVec.end();iter++){(*iter)->Operation();}}Component* Composite::GetChild(int index){if (index < 0 ||index > this->m_ComVec.size()){return NULL;}return this->m_ComVec[index];}int _tmain(int argc, _TCHAR* argv[]){ /*      不管是叶子Leaf还是Composite对象pRoot、pCom都实现了Operation接口，所以可以一致对待，直接调用Operation()      体现了“使得用户对单个对象和组合对象的使用具有一致性。”    */    Composite* pRoot = new Composite();    //组合对象添加叶子节点    pRoot->Add(new Leaf());    Leaf* pLeaf1 = new Leaf();    Leaf* pLeaf2 = new Leaf();    //这里的叶子再添加叶子是没有意义的。    //由于叶子与组合对象继承了相同的接口，所以语法上是对的，实际上什么也没做(继承自基类Component的Add方法)。    //叶子节点只实现了Operation方法，其他Add、Remove、GetChild都继承自基类，没有实际意义。    pLeaf1->Add(pLeaf2);    pLeaf1->Remove(pLeaf2);    //执行叶子Operation操作    pLeaf1->Operation();    //组合对象实现了基类Component的所有接口，所以可以做各种操作(Add、Remove、GetChild、Operation)。    Composite* pCom = new Composite();    //组合对象添加叶子节点    pCom->Add(pLeaf1);    //组合对象添加叶子节点    pCom->Add(pLeaf2);    //执行组合对象Operation操作    pCom->Operation();    //组合对象添加组合对象   // pRoot->Add(pCom);    //执行组合对象Operation操作    //pRoot->Operation();    //Component* cp = pCom->GetChild(0);    //cp->Operation();    //pCom->Remove(pLeaf1);getchar();return 0;}</span>

 

 

 

输出结果：

 

 

 

文章来源：

 

http://www.cnblogs.com/jiese/p/3168844.html