Method start_accept

example/cpp11/windows/transmit_file.cpp:124–132

private:
  void start_accept()
  {
    connection::pointer new_connection =
      connection::create(acceptor_.get_executor().context(), filename_);

    acceptor_.async_accept(new_connection->socket(),
        std::bind(&server::handle_accept, this, new_connection,
          boost::asio::placeholders::error));
  }

  void handle_accept(connection::pointer new_connection,
      const boost::system::error_code& error)