boost::asio::deadline_timer的使用

#include <iostream>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
using namespace std;


void Print(const boost::system::error_code &ec,
            boost::asio::deadline_timer* pt,
            int * pcount)
{
    if (*pcount < 3)
    {
        cout<<"count = "<<*pcount<<endl;
        cout<<boost::this_thread::get_id()<<endl;
        (*pcount) ++;

        pt->expires_at(pt->expires_at() + boost::posix_time::seconds(5)) ;

        pt->async_wait(boost::bind(Print, boost::asio::placeholders::error, pt, pcount));

    }
}
int main()
{
    cout<<boost::this_thread::get_id()<<endl;
    boost::asio::io_service io;
    boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));
    int count = 0;
    t.async_wait(boost::bind(Print, boost::asio::placeholders::error, &t, &count));
    cout<<"to run"<<endl;
    io.run();
    cout << "Final count is " << count << "\n";
    cout<<"exit"<<endl;
    return 0;
}