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

   1 //
   2 // timer.cpp
   3 // ~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 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/bind.hpp>
  14
  15 class printer
  16 {
  17 public:
  18   printer(boost::asio::io_context& io)
  19     : timer_(io, boost::asio::chrono::seconds(1)),
  20       count_(0)
  21   {
  22     timer_.async_wait(boost::bind(&printer::print, this));
  23   }
  24
  25   ~printer()
  26   {
  27     std::cout << "Final count is " << count_ << std::endl;
  28   }
  29
  30   void print()
  31   {
  32     if (count_ < 5)
  33     {
  34       std::cout << count_ << std::endl;
  35       ++count_;
  36
  37       timer_.expires_at(timer_.expiry() + boost::asio::chrono::seconds(1));
  38       timer_.async_wait(boost::bind(&printer::print, this));
  39     }
  40   }
  41
  42 private:
  43   boost::asio::steady_timer timer_;
  44   int count_;
  45 };
  46
  47 int main()
  48 {
  49   boost::asio::io_context io;
  50   printer p(io);
  51   io.run();
  52
  53   return 0;
  54 }