ceph/src/boost/libs/asio/example/cpp03/tutorial/timer4/timer.cpp

   1 //
   2 // timer.cpp
   3 // ~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include <iostream>
  12 #include <boost/asio.hpp>
  13 #include <boost/bind.hpp>
  14 #include <boost/date_time/posix_time/posix_time.hpp>
  15
  16 class printer
  17 {
  18 public:
  19   printer(boost::asio::io_context& io)
  20     : timer_(io, boost::posix_time::seconds(1)),
  21       count_(0)
  22   {
  23     timer_.async_wait(boost::bind(&printer::print, this));
  24   }
  25
  26   ~printer()
  27   {
  28     std::cout << "Final count is " << count_ << std::endl;
  29   }
  30
  31   void print()
  32   {
  33     if (count_ < 5)
  34     {
  35       std::cout << count_ << std::endl;
  36       ++count_;
  37
  38       timer_.expires_at(timer_.expires_at() + boost::posix_time::seconds(1));
  39       timer_.async_wait(boost::bind(&printer::print, this));
  40     }
  41   }
  42
  43 private:
  44   boost::asio::deadline_timer timer_;
  45   int count_;
  46 };
  47
  48 int main()
  49 {
  50   boost::asio::io_context io;
  51   printer p(io);
  52   io.run();
  53
  54   return 0;
  55 }