Re: ref. to object functions from threads

From: bill_kempf (williamkempf_at_[hidden])
Date: 2002-09-05 17:36:19

--- In Boost-Users_at_y..., Luis De la Parra <lparrab_at_g...> wrote:
> 
> hi all,
> is there a way to get a reference to the function object used by a 
> boost::thread object??

No, and it would be very difficult to do so, since the type is lost.

> when you create a new thread and feed it a function object it 
copies it and 
> then starts a new thread of execution on this object.. well, I 
would like to 
> send messages to the object in which the thread is running but I 
don't know 
> how to do it with boos.threads...

Only by wrapping it in an adapter.  The boost::ref class is a very 
good candidate for this.  Here's an example, and I'll add this to 
the next release:

#include <boost/ref.hpp>
#include <boost/thread/thread.hpp>
#include <iostream>

struct thread_func
{
   thread_func() : val(0) { }
   void operator()() { val = 99; }
   int val;
};

int main()
{
   thread_func f;
   boost::thread thrd(boost::ref(f));
   thrd.join();
   std::cout << f.val << std::endl; // should be "99"
}

Bill Kempf