#pragma once #include "stdafx.h"#include <queue> #include<iostream> using namespace std;//設(shè)計(jì)模式-狀態(tài)模式State /* 當(dāng)一個(gè)對(duì)象的內(nèi)在狀態(tài)改變時(shí)，允許改變其行為，這個(gè)對(duì)象看起來(lái)就是改變了類。 */class CContexct;class CState {//抽象狀態(tài)類，定義一個(gè)接口以封裝與Context的一個(gè)特定狀態(tài)相關(guān)的行為。 public:virtual void Handle(CContexct *pContext) = 0; };class CContexct {//維護(hù)一個(gè)concretestate子類的實(shí)例，這個(gè)實(shí)例定義當(dāng)前的狀態(tài)。 private:CState *m_pState;queue<CState *>m_qHashMemory; public:CContexct(CState *pState) {while (!m_qHashMemory.empty()) {m_qHashMemory.pop();}m_pState = pState;m_qHashMemory.push(m_pState);}~CContexct() {while (!m_qHashMemory.empty()) {delete m_qHashMemory.front();m_qHashMemory.pop();}}void SetContext(CState *pState) {m_pState = pState;m_qHashMemory.push(m_pState);}void Request() {m_pState->Handle(this);} };class CConcreteStateC :public CState {//具體狀態(tài)，每一個(gè)子類實(shí)現(xiàn)一個(gè)與Context的一個(gè)狀態(tài)相關(guān)的行為。 public:void Handle(CContexct *pContext) {cout << "over" << endl;return;} };class CConcreteStateB : public CState { public:void Handle(CContexct *pContext) {pContext->SetContext(new CConcreteStateC());pContext->Request();} };class CConcreteStateA : public CState { public:void Handle(CContexct *pContext) {pContext->SetContext(new CConcreteStateB());pContext->Request();} };int main() {CContexct *pContexct = new CContexct(new CConcreteStateA());pContexct->Request();delete pContexct;getchar();return 0; }

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