[Discuss-gnuradio] gcell.set_singleton()

[Chuck Swiger]

In gr-gcell/src/qa_fft.py there is a method of gcell called 'set_singleton'.

   gcell.set_singleton(self.mgr)

All I can glean from the source is it has something to do with boost  
weak pointers. What, basically, is it doing?   I've played with the  
python code to stream data to multiple spe's and it all works as  
expected.  All I know is that if it's commented out we get:

   terminate called after throwing an instance of 'boost::bad_weak_ptr'
     what():  tr1::bad_weak_ptr
   Aborted


From boost:

    weak_ptr  	<boost/weak_ptr.hpp>  	Non-owning observers of an  
object owned by shared_ptr.

--Chuck