Re: [Boost-users] [thread] is this a bug?

From: Marshall Clow (marshall_at_[hidden])
Date: 2008-02-11 13:31:31

At 10:59 AM -0700 2/11/08, Hector C wrote:
>Hello fellow boost fans,
>
>Could anyone explain to me why the destructor (in the program listed
>below) seems to be called 10 times but the constructor only one time?
>The output of the program is also shown below.

I think that adding a copy constructor and/or an assignment operator 
to your sample will help with your enlightenment. ;-)

>--- BEGIN PROGRAM ---
>#include <boost/thread/thread.hpp>
>#include <iostream>
>
>using namespace std;
>
>struct ThreadBug
>{
>      ThreadBug()
>      {
>          cout <<  "Begin sending ... "  << endl;
>      }
>
>      ~ThreadBug()
>      {
>          cout <<  "End sending ... "  << endl;
>      }

       ThreadBug ( const ThreadBug &rhs ) { cout << "Copy constructing 
... " << endl; }
       ThreadBug & operator = ( const ThreadBug &rhs ) { cout << 
"Assigning ... " << endl;  return *this; }

>      void operator()()
>      {
>          cout <<  "Do something ... "  << endl;
>      }
>} w_ThreadBug;
>
>int main()
>{
>      cout <<  "New Sequence -----------"  << endl;
>      boost::thread thrd(w_ThreadBug);
>      thrd.join();
>      cout <<  "End New Sequence -----------"  << endl;
>      return 0;
>}
>---END PROGRAM ---

-- 
-- Marshall
Marshall Clow     Idio Software   <mailto:marshall_at_[hidden]>
It is by caffeine alone I set my mind in motion.
It is by the beans of Java that thoughts acquire speed,
the hands acquire shaking, the shaking becomes a warning.
It is by caffeine alone I set my mind in motion.