VisitorMode.h#pragma once #include<list> #include<string> #include<iostream> using namespace std;/* 設(shè)計(jì)模式-訪問(wèn)者模式（Visitor） 表示一個(gè)作用于某對(duì)象機(jī)構(gòu)中各元素的操作。它使你可以在不改變各元素的類(lèi)的前提下定義作用于 這些元素的新操作。 */class CConcreteElementA; class CConcreteElementB;class CVisitor {//為該對(duì)象結(jié)構(gòu)中ConcreteElement的每個(gè)類(lèi)聲明一個(gè)Visit操作。 public:virtual void VisitConcreteElementA(CConcreteElementA * pConcreteElementA) = 0;virtual void VisitConcreteElementB(CConcreteElementB * pConcreteElementB) = 0; };class ConcreteVisitor1 :public CVisitor {//具體訪問(wèn)者類(lèi) public:void VisitConcreteElementA(CConcreteElementA * pConcreteElementA);void VisitConcreteElementB(CConcreteElementB * pConcreteElementB); };class ConcreteVisitor2 :public CVisitor {//具體訪問(wèn)者類(lèi) public:void VisitConcreteElementA(CConcreteElementA * pConcreteElementA);void VisitConcreteElementB(CConcreteElementB * pConcreteElementB); };class CElement {//定義一個(gè)Accept操作,它以一個(gè)訪問(wèn)者為參數(shù) public:virtual void Accept(CVisitor *pVisitor) = 0; };class CConcreteElementA :public CElement { private:string mstrName; public:CConcreteElementA(const string &strName);void Accept(CVisitor *pVisitor);void OperationA() {}//A的單獨(dú)方法string GetName(); };class CConcreteElementB :public CElement { private:string mstrName; public:CConcreteElementB(const string &strName);void Accept(CVisitor *pVisitor);void OperationB() {}//B的單獨(dú)方法string GetName(); };class CobjuctStructure {//定義一個(gè)高層接口，以允許訪問(wèn)者訪問(wèn)它的元素。 private:list<CElement*>mlElement; public:CobjuctStructure();~CobjuctStructure();void Attach(CElement *pElement);void Eetach(CElement *pElement);void Accept(CVisitor *pVisitor); };VisitorMode.cpp #include "stdafx.h" #include "VisitorMode.h"void ConcreteVisitor1::VisitConcreteElementA(CConcreteElementA * pConcreteElementA) {cout << "1-A:" << pConcreteElementA->GetName() << endl; } void ConcreteVisitor1::VisitConcreteElementB(CConcreteElementB * pConcreteElementB) {cout << "1-B:" << pConcreteElementB->GetName() << endl; }void ConcreteVisitor2::VisitConcreteElementA(CConcreteElementA * pConcreteElementA) {cout << "2-A:" << pConcreteElementA->GetName() << endl; } void ConcreteVisitor2::VisitConcreteElementB(CConcreteElementB * pConcreteElementB) {cout << "2-B:" << pConcreteElementB->GetName() << endl; }CConcreteElementA::CConcreteElementA(const string &strName) {mstrName = strName;} void CConcreteElementA::Accept(CVisitor *pVisitor) {pVisitor->VisitConcreteElementA(this); } string CConcreteElementA::GetName() {return mstrName; }CConcreteElementB::CConcreteElementB(const string &strName) {mstrName = strName;} void CConcreteElementB::Accept(CVisitor *pVisitor) {pVisitor->VisitConcreteElementB(this); } string CConcreteElementB::GetName() {return mstrName; }CobjuctStructure::CobjuctStructure() {mlElement.clear(); } CobjuctStructure::~CobjuctStructure() {for each(CElement* index in mlElement) {delete index;} } void CobjuctStructure::Attach(CElement *pElement) {mlElement.push_back(pElement); } void CobjuctStructure::Eetach(CElement *pElement) {mlElement.remove(pElement); } void CobjuctStructure::Accept(CVisitor *pVisitor) {for each (CElement * index in mlElement) {index->Accept(pVisitor);} }客戶端調(diào)用#include<string> #include<iostream> #include "VisitorMode.h" using namespace std;int main() {CobjuctStructure *pO = new CobjuctStructure();pO->Attach(new CConcreteElementA("man"));pO->Attach(new CConcreteElementB("woman"));ConcreteVisitor1 *pV1 = new ConcreteVisitor1();ConcreteVisitor2 *pV2 = new ConcreteVisitor2();pO->Accept(pV1);pO->Accept(pV2);delete pO, delete pV1, delete pV2;getchar();return 0; }

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