Re: [Boost-users] [Signals2] Signal disconnect wrapper won't work

Subject: Re: [Boost-users] [Signals2] Signal disconnect wrapper won't work
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2009-07-07 16:57:15

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On Tuesday 07 July 2009, Marc DelaCruz wrote:
> Doing the following seems to work. 

So it turns out Boost.Bind does return function objects that are equality 
comparable, albeit not with the proper semantics for comparison against a 
boost::function.  However, Boost.Bind also provides undocumented 
function_equal overloads which do make comparison against boost::function 
objects work.  So you can use a boost::bind return value to 
disconnect-by-slot, although IMO using signals2::connection objects is still 
preferable.

> I have equivalent slots tied to the 
> signal and
> needed to disconnect only specific ones. I guess I could force a grouping
> for each added
> slot and disconnect via the grouping.
>
> template<typename T>
> void disconnect (void (T::*pMemFunc)(), T* pObj, VoidSignal& rSig)
> {
>      rSig.disconnect(boost::bind(pMemFunc, pObj));
> }
>
> -----Original Message-----
> From: boost-users-bounces_at_[hidden]
> [mailto:boost-users-bounces_at_[hidden]]On Behalf Of Frank Mori Hess
> Sent: Tuesday, July 07, 2009 10:31 AM
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] [Signals2] Signal disconnect wrapper won't
> work

> I don't
> believe the function objects returned by bind are either.  The best
> workaround would be to not use disconnect-by-slot at all and use the
> connection object returned by the connect call to disconnect.
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