boost samples

multiple_timers.cpp

#include <iostream>
#include <map>
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>

enum { N = 10 };

void print(int i, const boost::system::error_code& error)
{   
    if(!error){
        std::cout << "--> timer " << i << std::endl;
    }
}

typedef boost::shared_ptr<boost::asio::deadline_timer> timer_ptr;

int main(int argc, char *argv[])
{   
    boost::asio::io_service io;
    std::map<int, timer_ptr> timers;
    for (int i = 0; i < N; ++i) {
        timer_ptr t(new boost::asio::deadline_timer(io));
        t->expires_from_now(boost::posix_time::seconds(i));
        t->async_wait(boost::bind(print, i, _1));
        timers.insert(std::pair<int, timer_ptr>(i, t));
    }
    for (int i = 5; i < N; ++i) {
        // timers[i]->cancel();                                                 
        timers.erase(i);
    }
    io.run();
    return 0;
}