// // timer.cpp // ~~~~~~~~~ // // Copyright (c) 2003-2022 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 <asio.hpp> #include <boost/bind/bind.hpp> class printer { public: printer(asio::io_context& io) : timer_(io, 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() + asio::chrono::seconds(1)); timer_.async_wait(boost::bind(&printer::print, this)); } } private: asio::steady_timer timer_; int count_; }; int main() { asio::io_context io; printer p(io); io.run(); return 0; }
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