组合模式理解Cocosd-x游戏引擎之addChild函数

#include <iostream>#include <string>#include <vector>using namespace std;class Composite{public:    Composite():_name(""){}    Composite(string name):_name(name){}    virtual ~Composite(){}    virtual void operation()=0;        virtual void add(Composite*){}    virtual void del(Composite*){}    virtual Composite* find(int index){return NULL;}protected:    string _name;};class Leaf : public Composite{public:    Leaf(){}    Leaf(string name){_name=name;}    virtual ~Leaf(){}    void operation(){cout<<_name<<endl;}};class subComposite : public Composite{public:    subComposite():level(0){}    subComposite(string name):level(0){_name=name;}    virtual ~subComposite(){}    void add(Composite*);    void del(Composite*);    Composite* find(int index);    void operation();private:    vector<Composite*> v_pcom;    int level;};void subComposite::add(Composite* com){    level++;    v_pcom.push_back(com);}void subComposite::del(Composite* com){    v_pcom.pop_back();}Composite* subComposite::find(int index){    return v_pcom[index];}void subComposite::operation(){    for(int i=0;i<level;i++)        cout<<"+";    cout<<_name<<endl;    vector<Composite*>::iterator it;    for (it=v_pcom.begin();it!=v_pcom.end();it++)    {        (*it)->operation();    }}int main(){    Composite* psubcom=new subComposite("动物");    Composite* psubcom1=new subComposite("非哺乳动物");    Composite* pleaf1=new Leaf("鸟");    Composite* pleaf2=new Leaf("鱼");    Composite* psubcom2=new subComposite("哺乳动物");    Composite* pleaf3=new Leaf("人");        psubcom1->add(pleaf1);    psubcom1->add(pleaf2);    psubcom2->add(pleaf3);    psubcom->add(psubcom1);    psubcom->add(psubcom2);    psubcom->operation();    delete pleaf1;    delete pleaf2;    delete pleaf3;    delete psubcom1;    delete psubcom2;    delete psubcom;    system("pause");    return 0;}/*++动物++非哺乳动物鸟鱼+哺乳动物人请按任意键继续. . .*/