5.28 1h

void HandleCall(Call &call)

class Employee {

Handler h;

public:

bool free;

void ReceiveCall (Call &call); // doesn’t return until the call is finished

void CanHandleCall (Call &call);

void CannotHandleCall (Call &call);

}

void Employee::ReceiveCall (Call &call) {

free=false;

… // do stuff with the call

}

class Tech : public Employee {

}

class Superadvisor : public Employee {

}

class Voicemail {

public:

void storeMessages(Call &call);

}

class Handler {

private:

int level;

int tech_num;

queue<Call> callqueue;

queue<Tech> techs;

int pos_tech;

Superadvisor ad;

Voicemail v;

public:

Employee AssignCall(Call &call);

void AnwserCall (Call &call);

void AddFreeTech (Employee &em);

}

Employee Handler::AssignCall(Call &call) {

if (!techs.empty()){

Employee em=techs.front();

techs.pop();

return em;

}

if (ad.free) return ad;

return NULL;

}

void Handler::AddFreeTech (Employee &em) {

techs.push(em);

}

void Handler::AnswerCall(Call &call) {

Employee em=AssingCall(call);

if (em!=NULL) {

em.ReceiveCall(call);

}else {

// voice mail box

v.storeMessge(call);

}

}