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

From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2007-02-02 10:03:50

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On Friday 02 February 2007 06:34 am, Timmo Stange wrote:
> deliverNews.connect(boost::bind(&NewsMessageArea::displayNews,
>                      boost::signals::track(newsMessageArea), _1));
>
> The wrapper signals::track would expect a shared_ptr and transport
> a weak_ptr. The information could be collected with visit_each just
> like it is done now and the number of trackable objects would only
> be limited by boost::bind. I think it is acceptable that the client
> code must maintain a shared_ptr to the tracked instance, as that's
> expressing rather well what is happening here (even though it
> doesn't really share the ownership, it shares information about the
> object).

That does seem more elegant, although I need to learn more about how 
boost::trackable and visit_each work to understand how it would be 
implemented.  Is this something you would be willing to code?

> > Patch attached.
>
> Um, looks like I got it wrong. Fixed version attached.

Your changes are fine with me.  I'm going to use protected virtual 
functions instead of private though, as I find it less confusing (as in 
"that actually works?", the c++ faq agrees with me!).  Also, connected() 
is missing a return.

- -- 
Frank
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