...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
// // timer.cpp // ~~~~~~~~~ // // Copyright (c) 2003-2021 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/thread/thread.hpp> #include <boost/bind/bind.hpp> class printer { public: printer(boost::asio::io_context& io) : strand_(boost::asio::make_strand(io)), timer1_(io, boost::asio::chrono::seconds(1)), timer2_(io, boost::asio::chrono::seconds(1)), count_(0) { timer1_.async_wait(boost::asio::bind_executor(strand_, boost::bind(&printer::print1, this))); timer2_.async_wait(boost::asio::bind_executor(strand_, boost::bind(&printer::print2, this))); } ~printer() { std::cout << "Final count is " << count_ << std::endl; } void print1() { if (count_ < 10) { std::cout << "Timer 1: " << count_ << std::endl; ++count_; timer1_.expires_at(timer1_.expiry() + boost::asio::chrono::seconds(1)); timer1_.async_wait(boost::asio::bind_executor(strand_, boost::bind(&printer::print1, this))); } } void print2() { if (count_ < 10) { std::cout << "Timer 2: " << count_ << std::endl; ++count_; timer2_.expires_at(timer2_.expiry() + boost::asio::chrono::seconds(1)); timer2_.async_wait(boost::asio::bind_executor(strand_, boost::bind(&printer::print2, this))); } } private: boost::asio::strand<boost::asio::io_context::executor_type> strand_; boost::asio::steady_timer timer1_; boost::asio::steady_timer timer2_; int count_; }; int main() { boost::asio::io_context io; printer p(io); boost::thread t(boost::bind(&boost::asio::io_context::run, &io)); io.run(); t.join(); return 0; }
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