teller.h

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#ifndef TELLER_H_INCLUDED
#define TELLER_H_INCLUDED
 
inline int lcg_rand (int n);
 
class Customer
{
public:
 
    int arrivalTime;
    int processTime;
 
    Customer (int at = 0)
        : arrivalTime (at),
          processTime (2 + lcg_rand (6)) {}
 
    bool done () {   // are we done with our transaction?
        return --processTime < 0;
    }
 
    bool operator< (const Customer& c) const {   // order by arrival time
        return arrivalTime < c.arrivalTime;
    }
};
 
 
class Teller
{
public:
    Teller (): free (true) { }
 
    bool isFree () {   // are we free to service new customer?
        if (free)
            return true;
        if (customer.done())
            free = true;
        return free;
    }
 
    void addCustomer (const Customer &c) {   // start serving new customer
        customer = c;
        free = false;
    }
 
private:
 
    bool     free;
    Customer customer;
};
 
#endif   // TELLER_H_INCLUDED