'workIsDone' cannot be implicitly captured because no default capture mode has been specified

int _tmain(int argc, _TCHAR* argv[])
{
    Restaurant r;
    r.Work();
 
    return 0;
}

class Restaurant
{
public:
    Restaurant();
    ~Restaurant();
 
public:
    void Work();
 
private:
    Cook cook_;
    std::shared_ptr<boost::condition_variable_any> cond_;
    std::shared_ptr<boost::mutex> mutex_;
    Waiter waiter_;
};

Restaurant::Restaurant() 
    : cook_(Cook())
    , cond_(new boost::condition_variable_any)
    , mutex_(new boost::mutex)
    , waiter_(Waiter())
{
}
 
Restaurant::~Restaurant() 
{
}
 
void Restaurant::Work()
{
    bool workIsDone = false;
 
    boost::thread t1(boost::bind(&Cook::CookTheDish, cook_, workIsDone, mutex_, cond_));
    boost::thread t2(boost::bind(&Waiter::DeliverTheDish, waiter_, workIsDone, mutex_, cond_));
 
    t1.join();
    t2.join();
}

 void Waiter::DeliverTheDish(
    bool& workIsDone, 
    std::shared_ptr<boost::mutex> mutex, 
    std::shared_ptr<boost::condition_variable_any> cond)
{
    for(int i = 0; i < 10; ++i)
    {
        boost::unique_lock<boost::mutex> lock(*mutex);
        cond->wait(lock, []{ return workIsDone; });
        workIsDone = false;
        boost::this_thread::sleep(boost::posix_time::millisec(500));
        std::cout << "Waiter: Delivered the dish" << std::endl << std::endl;
    }
}