Re: [Boost-users] [signals] Automatic connection management and MT

From: Timmo Stange (ts_at_[hidden])
Date: 2007-02-06 12:40:03

Frank Mori Hess wrote:

> It turns out it doesn't need to be implicitly convertible to shared_ptr at 
> all, like I imagined before I read the mem_fn docs.  It just needs a 
> get_pointer function.  I'm currently using a stripped down 
> signals::tracked object that is just a thin wrapper around weak_ptr, with 
> the following get_pointer function:

That is good news indeed.

> template<typename T>
> T* get_pointer(const signals::tracked<T> &tracked) {return 
> tracked.lock().get();}

I wouldn't use lock() but an explicit shared_ptr conversion here as
you will probably want it to throw bad_weak_ptr when the client code
uses a dead reference outside your signals functionality.

I also realized that the abstract base class design is thankfully
unnecessary as a shared_ptr<void> apparently knows what destructor
to call when initialized from the correct pointer type (according
to the docs). I'll see if I can find the time to commit sample code
tonight.

Regards

Timmo Stange