Question

sau_timer::sau_timer(int secs, timerparam f) : strnd(io), 
    t(io, boost::posix_time::seconds(secs))
{
    assert(secs > 0);
    this->f = f;

    //t.async_wait(boost::bind(&sau_timer::exec, this, _1));
    t.async_wait(strnd.wrap(boost::bind(&sau_timer::exec, this)));
    boost::thread thrd(&io,this);
    io.run();
    //thrd(&sau_timer::start_timer);
}

This is the code I have in the constructor for the class ‘sau_timer’ (which will hopefully run a timer in a seperate thread and then call another function).

Unfortunately, atm when I try to compile, I get the following error:

1>c:\program files\boost\boost_1_39\boost\bind\bind.hpp(246) : error C2064: term does not evaluate to a function taking 1 arguments

Aswell as a whole bunch of warnings. What am I doing wrong? I’ve tried everything I can think of, thank you.

Answer 1

The explanation is at the end of the error messages:

c:\users\ben\documents\visual studio 2008\projects\sauria\sauria\sau_timer.cpp(11) :
  see reference to function template instantiation 
  'boost::thread::thread<boost::asio::io_service*,sau_timer*>(F,A1)' being compiled

The error occurs while generating the ctor of boost::thread. It expects a function object (something with an opererator()()), and you pass it what (I guess) is an io::service. If what you want is a thread calling io_service::run, write:

boost::thread thrd(boost::bind(&io_service::run, &io));

If you use a relatively recent version of Boost, I believe that thread’s ctor has a convenience overload that takes care of the bind(), allowing to simply write:

boost::thread thrd(&io_service::run, &io);