[boost] Timer1 Using a timer asynchronously

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C:\local\boost_1_64_0

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C:\local\boost_1_64_0\lib32-msvc-14.0

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

void print(const boost::system::error_code & e)
{
    std::cout << "Hello, world!" << std::endl;
}

int main()
{
    boost::asio::io_service io;

    boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));

    t.async_wait(&print);

    io.run();

    return 0;
}

The asio library provides a guarantee that callback handlers will only be called from threads that are currently calling io_service::run(). Therefore unless the io_service::run() function is called the callback for the asynchronous wait completion will never be invoked.

http://www.boost.org/doc/libs/1_64_0/doc/html/boost_asio/tutorial/tuttimer2.html