Re: [Boost-users] Using boost.signals with boost.bind

Subject: Re: [Boost-users] Using boost.signals with boost.bind
From: Sergey Kishchenko (voidwrk_at_[hidden])
Date: 2008-10-14 10:27:53

It works. Thank you!
Signals2 lib is brilliant. I'll use it in my app. I hope this lib will be
part of the next Boost release.

With regards,
Sergey Kishchenko

2008/10/14 Frank Mori Hess <frank.hess_at_[hidden]>

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> On Monday 13 October 2008 08:25 am, Sergey Kishchenko wrote:
> >     boost::shared_ptr<signal_type> apSig(new signal_type());
> >     apSig->connect(binded_func);
> >     (*apSig)();
> >
> >     apSig.reset(new signal_type());
> >     boost::signals::connection con = apSig->connect(binded_func);
> >     std::cout<<"Connected: "<<con.connected()<<" Blocked:
> > "<<con.blocked()<<"\n"; }
> >
> >
> > Program output:
> >
> > Func::operator(42)
> > Connected: 0 Blocked: 1
> >
> > Ie, if i create new signal and then try to connect to the same slot, it
> > fails. If I use not boost::bind object but only boost::function as slot,
> > all works ok. I can not understand, why? I used Boost 1.34.1, gcc 4.1.2
>
> It looks like a bug to me.  In boost.signals, the slot has a shared_ptr to
> its
> signal/slot connection, which I think it uses for automatic connection
> management.  So it looks like it was coded under the assumption a slot
> object
> (or any of its copies) would not be re-used with more than 1 signal.  The
> slot is probably (permanently) auto-disconnecting when the first signal it
> was connected to is destroyed.  The signals2 lib, which might get reviewed
> soon if there are enough reviewers, doesn't show this problem.
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