一. 狀態(tài)模式

定義：允許一個(gè)對(duì)象在其內(nèi)部狀態(tài)改變時(shí)改變它的行為。對(duì)象看起來(lái)似乎修改了它的類。

實(shí)現(xiàn)方式1：

workstate 狀態(tài)抽象類

workstate1 狀態(tài)實(shí)現(xiàn)類1

workstate2 狀態(tài)實(shí)現(xiàn)類2

workstate3 狀態(tài)實(shí)現(xiàn)類3

workstate4 狀態(tài)實(shí)現(xiàn)類4

workoperation 任務(wù)執(zhí)行類

這種狀態(tài)模式是比較簡(jiǎn)單的狀態(tài)模式，通過(guò)任務(wù)執(zhí)行類改變狀態(tài)的走向，代碼如下

class workstate {virtual void operation() = 0; };class workstate1 {virtual void operation() {cout<<"Do WorkState1"<<endl;} };class workstate2 {virtual void operation() {cout<<"Do WorkState2"<<endl;} };class workstate3 {virtual void operation() {cout<<"Do WorkState3"<<endl;} };class workstate4 {virtual void operation() {cout<<"Do WorkState4"<<endl;} };class workoperation{workoperation(int state);private:int m_state;void doOperation(){switch(m_state){case 1:workstate *pstate = new workstate1();pstate->operation();m_state = 2;break;case 2:workstate *pstate = new workstate2();pstate->operation();m_state = 3;break;case 3:workstate *pstate = new workstate3();pstate->operation();m_state = 4;break;case 4:workstate *pstate = new workstate4();pstate->operation();m_state = 1;break;}}void setstate(int g_state){m_state = g_state;}int getstate(){return m_state;} };

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實(shí)現(xiàn)方式2：

workstate 狀態(tài)抽象類

workstate1 狀態(tài)實(shí)現(xiàn)類1

workstate2 狀態(tài)實(shí)現(xiàn)類2

workstate3 狀態(tài)實(shí)現(xiàn)類3

workstate4 狀態(tài)實(shí)現(xiàn)類4

workoperation 任務(wù)執(zhí)行類

這種狀態(tài)模式，通過(guò)狀態(tài)實(shí)現(xiàn)類實(shí)現(xiàn)任務(wù)執(zhí)行類的狀態(tài)變化，代碼如下

class workoperation; class workstate1; class workstate2; class workstate3; class workstate4;static workstate1 m_workstate1; static workstate2 m_workstate2; static workstate3 m_workstate3; static workstate4 m_workstate4;class workstate {virtual void operation() = 0;workoperation *m_workoperation; };class workstate1:public workstate {workstate1(workoperation *g_workoperation){m_workoperation = g_workoperation;}virtual void operation() {cout<<"Do WorkState1"<<endl;m_workoperation::m_workstate = &m_workstate2m_workoperation->m_state(2);} };class workstate2:public workstate {workstate2(workoperation *g_workoperation){m_workoperation = g_workoperation;}virtual void operation() {cout<<"Do WorkState2"<<endl;m_workoperation::m_workstate = &m_workstate3m_workoperation->m_state(3);} };class workstate3:public workstate {workstate3(workoperation *g_workoperation){m_workoperation = g_workoperation;}virtual void operation() {cout<<"Do WorkState3"<<endl;m_workoperation::m_workstate = &m_workstate4m_workoperation->m_state(4);} };class workstate4:public workstate {workstate4(workoperation *g_workoperation){m_workoperation = g_workoperation;}virtual void operation() {cout<<"Do WorkState4"<<endl;m_workoperation::m_workstate = &m_workstate1m_workoperation->m_state(1);} };class workoperation{workoperation(workstate *pstate){m_workstate = pstate;}private:workstate *m_workstate;int m_state;void doOperation(){m_workstate->operation();}void setstate(int g_state){m_state = g_state;}int getstate(){return m_state;} };

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轉(zhuǎn)載于:https://www.cnblogs.com/forbeat/p/5072660.html

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