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- //
- // timer.cpp
- // ~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- #include <iostream>
- #include <boost/asio.hpp>
- #include <boost/bind.hpp>
- class printer
- {
- public:
- printer(boost::asio::io_context& io)
- : timer_(io, boost::asio::chrono::seconds(1)),
- count_(0)
- {
- timer_.async_wait(boost::bind(&printer::print, this));
- }
- ~printer()
- {
- std::cout << "Final count is " << count_ << std::endl;
- }
- void print()
- {
- if (count_ < 5)
- {
- std::cout << count_ << std::endl;
- ++count_;
- timer_.expires_at(timer_.expiry() + boost::asio::chrono::seconds(1));
- timer_.async_wait(boost::bind(&printer::print, this));
- }
- }
- private:
- boost::asio::steady_timer timer_;
- int count_;
- };
- int main()
- {
- boost::asio::io_context io;
- printer p(io);
- io.run();
- return 0;
- }
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