Method Printer

examples/asio/tutorial/timer4/timer.cc:8–14

{
 public:
  Printer(muduo::net::EventLoop* loop)
    : loop_(loop),
      count_(0)
  {
    // Note: loop.runEvery() is better for this use case.
    loop_->runAfter(1, std::bind(&Printer::print, this));
  }

  ~Printer()
  {