设计模式复习-组合模式
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设计模式复习-组合模式
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#pragma once
#include "stdafx.h"
#include<set>
#include<string>
#include<iostream>
using namespace std;/*
设计模式-组合模式(Composite)[用类建一棵树]将对象组合成树形结构以表示 部分-整体 的层次结构。组合模式使得用户对
单个对象和组合对象的使用具有一致性。
*/class CComponent {//所有节点统一接口
protected:string m_strName;
public:CComponent(const string &strName) {m_strName = strName;}virtual void Add(CComponent * const pc) = 0;virtual void Remove(CComponent * const pc) = 0;virtual void Display(const int & nDepth) = 0;
};class CLeaf : public CComponent {
public:CLeaf(const string &strName) : CComponent(strName) {}void Add(CComponent *const pc) {cout << "Cannot add to a leaf" << endl;}void Remove(CComponent *const pc) {cout << "Cannot remove from a leaf" << endl;}void Display(const int &nDepth) {cout << "-" << nDepth << ":" << m_strName << endl;}
};class CCpmposite : public CComponent {
private:set<CComponent*>m_cChildren;
public:CCpmposite(const string &strName) : CComponent(strName) {m_cChildren.clear();}void Add(CComponent * const pc) {m_cChildren.insert(pc);}void Remove(CComponent * const pc) {m_cChildren.erase(pc);delete pc;}void Display(const int &nDepth) {cout << "-" << nDepth << ":" << m_strName << endl;for each(auto i in m_cChildren) {i->Display(nDepth + 1);}}~CCpmposite() {for each(auto i in m_cChildren) {delete i;}}
};int main() {CCpmposite *pRoot = new CCpmposite("root");pRoot->Add(new CLeaf("Lead A"));pRoot->Add(new CLeaf("Lead B"));CCpmposite *pComp = new CCpmposite("Composite X");pComp->Add(new CLeaf("Lead A"));pComp->Add(new CLeaf("Lead B"));pRoot->Add(pComp);pRoot->Display(1);delete pRoot;getchar();return 0;
}
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