2019-11-09 02:41:43 +00:00
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#ifndef __DEMO_H__
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#define __DEMO_H__
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// <20><><EFBFBD><EFBFBD>״̬<D7B4><CCAC>
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class State
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{
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public:
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2021-04-04 13:09:08 +00:00
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virtual ~State(){}
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2019-11-09 02:41:43 +00:00
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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virtual void handle() = 0;
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};
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// <20><><EFBFBD><EFBFBD>״̬<D7B4><CCAC>
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class ConcreteState :public State
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{
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public:
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// ʵ<><CAB5>
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void handle(){
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// <20><><EFBFBD><EFBFBD>
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}
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};
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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class Context
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{
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public:
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// set<65><74><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD>
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void setState(State* iState){
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this->state = iState;
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}
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>װ<EFBFBD>ķ<EFBFBD><C4B7><EFBFBD>
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void request(){
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// do something
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state->handle();
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}
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private:
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// <20><><EFBFBD><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD>
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State *state;
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};
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// 1.<2E>ɻ<EFBFBD><C9BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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class Context
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{
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public:
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void convertState(){
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if (condition1){
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this->state = new ConcreteStateA();
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}
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else if (condition2){
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this->state = new ConcreteStateB();
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}
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else{
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// do something
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}
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}
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private:
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// <20><><EFBFBD><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD>
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State *state;
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};
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// 2.<2E>о<EFBFBD><D0BE><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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class ConcreteState :public State
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{
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public:
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void convertState(Context* ctx){
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if (condition1){
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ctx->setState(new ConcreteStateA());
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}
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else if (condition2){
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ctx->setState(new ConcreteStateB());
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}
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else{
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// do something
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}
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}
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};
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#endif //__DEMO_H__
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