使用 boost::asio::deadline_timer 制作计时器

Question

I want to make a Timer class with boost::asio::deadline_timer. I looked into this: How do I make the boost/asio library repeat a timer?

    class DeadlineTimer
    {
        boost::asio::io_service io;
        std::function<void()> fun;
        boost::asio::deadline_timer t;
        void runTimer()
        {
            fun();
            t.expires_at(t.expires_at() + boost::posix_time::seconds(2));
            t.async_wait(boost::bind(&DeadlineTimer::runTimer, this));
        }
    public:
        DeadlineTimer() :t(io, boost::posix_time::seconds(2)){}
        void setFunction(std::function<void()> _f)
        {
            fun = _f;
        }
        void run()
        {
            io.run();
        }
    };

    void test()
    {
        DeadlineTimer timer1;
        auto f = []() {
            cout << "hello world\n";
        };
        timer1.setFunction(f);
        timer1.run();
    }

It allows user to pass a self-defined timer function via timer1.setFunction(f); . Then repeatedly run it (in every 2 second under current circumstance).

But it doesn't work, no output at all.

Answer 1

After some trial-and-error, I've managed to update David Wyles' boost::asio::repeating_timer class to work with Boost >= 1.66 - this neatly encapsulates the functionality of a repeating timer. Online at https://github.com/mikehaben69/boost , including demo source and makefile.