Re: ref. to object functions from threads

5 Sep 2002


      --- In Boost-Users@y..., Luis De la Parra  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 
#include 
#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

Re: ref. to object functions from threads

bill_kempf