Design Mode -> State Machine Mode

Working and studying, a recent speech module, the boss arranged a task to do voice wake achieved. After lovemaking session myself silly not refuse to use the simplest way to achieve the vulgar, the boss looked at, you can use a state machine model to try to do, and then under the leadership of the boss, the state machine learning rewarding .
First, what is the status mode.
The official explanation: allows an object to alter its behavior when its internal state changes. The object will appear to change its class
own understanding: that is, when an external object A method of calling a class, when the method of changing a certain state, then it will switch to this method in which a corresponding state in class B.
Second, look at the code to understand

2.1 All states need a management class.
wakeupEngineManager

wakeupEngineManager {
public:

  wakeupEngineManager() : mCurrentStatus(std::make_shared<IdleStatus>(this)) { }
  
  bool  changeToNotWakeupStates（ ）{
      if ( nullptr ！= mCurrentStatus) {
            mCurrentStatus -> changeToNotWakeupStates();
      }
 }
  
  bool changeToWakeuped() {
       if ( nullptr ！= mCurrentStatus) {
            mCurrentStatus -> changeToWakeuped();
      }
}

  bool changeToIdle() {
     if ( nullptr ！= mCurrentStatus) {
            mCurrentStatus -> changeToIdle();
      }
  }
  
  void changeStatus(std::shared_ptr<WakeupStatusBase> currentStatus) {
   mCurrentStatus  = currentStatus；
}

private:
std::shared_ptr mCurrentStatus ;
}

2.2 WakeupStatusBase.h base class for all states.

class WakeupStatusBase {
public:
    WakeupStatusBase(){};
    virtual ~WakeupStatusBase(){};
    virtual bool  changeToNotWakeupStates = 0;
    virtual bool changeToWakeuped() = 0;
    virtual bool changeToIdle() = 0;
    virtual int currentStatusClass() = 0;
};

2.3 One of the states on behalf of class NotWakeupStatus wake engine started, but has not yet awakened.
NotWakeupStatus, inherited from WakeupStatusBase

class NotWakeupStatus: public WakeupStatusBase {
public:
NotWakeupStatus(wakeupEngineManager * engine) {
mWakeupEngine = engine；
}

bool  changeToNotWakeupStates() {
   // 在这里方法里面做初始化唤醒引擎的动作。
   return true；
}
bool changeToWakeuped(){
  if (nullptr != mWakeupEngine) {
           mWakeupEngine-> changeStatus(std::make_shared<WakeupedStatus>  (mWakeupEngine));
 }
 return true；

}

bool changeToIdle() {
      if (nullptr != mWakeupEngine) {
           mWakeupEngine-> changeStatus(std::make_shared<IdleStatus>  (mWakeupEngine));
     }
      return true；
 }

private:
wakeupEngineManager * mWakeupEngine;

}

And the latter method wakeupedStatus idleStatus basic classes and NotWakeupStatus as just a little difference in the base class.

2.4 One class WakeupedStatus Representative awakened state.
WakeupedStatus, inherited from WakeupStatusBase

class WakeupedStatus : public WakeupStatusBase {
public:
WakeupedStatus (wakeupEngineManager * engine) {
mWakeupEngine = engine；
}

bool  changeToNotWakeupStates() {
  if (nullptr != mWakeupEngine) {
           mWakeupEngine-> changeStatus(std::make_shared<NotWakeupStatus>  (mWakeupEngine));
   }
   return true；
}
bool changeToWakeuped(){
 // 在这里做唤醒之后的事情

}

bool changeToIdle() {
      if (nullptr != mWakeupEngine) {
           mWakeupEngine-> changeStatus(std::make_shared<IdleStatus>  (mWakeupEngine));
     }
      return true；
 }

private:
wakeupEngineManager * mWakeupEngine;

}

2.5 One representative of wake state class IdleStatus microphone module loses focus, or is the reason, can not be used.
IdleStatus, inherited from WakeupStatusBase

class IdleStatus : public WakeupStatusBase {
public:
WakeupedStatus (wakeupEngineManager * engine) {
mWakeupEngine = engine；
}

bool  changeToNotWakeupStates() {
  if (nullptr != mWakeupEngine) {
           mWakeupEngine-> changeStatus(std::make_shared<NotWakeupStatus>  (mWakeupEngine));
   }
   return true；
}

bool changeToWakeuped(){
    // 不能够从idle直接到wakeuped。
   return  false；
}

bool changeToIdle() {
    // 做切换到idle状态应该做的事情
      return true；
 }

private:
wakeupEngineManager * mWakeupEngine;
}

Third, the analysis of the code down to the basic state machine model is event-triggered event corresponding to migrate to the state.