RE: [Boost-users] Signals & Slots

From: Foster, Gareth (gareth.foster_at_[hidden])
Date: 2004-11-17 11:34:43

Interesting stuff, I had to read that a few times to understand the details
:)

Thanks for the reply Doug, do you mind at all if I forward this to the GTKmm
mailing list? I would like to ask them what they think of your
implementation. I hope to use GTKmm (which uses libsigc++ of course), and I
think boost is great, so I'd be interested to see if maybe the GTKmm devs
could be using boost more etc. I'm sure you get the idea, main thing is, I
don't want it to look like I am trying to start a slaging match (hence me
asking first) :)

Cheers mate

Gaz

-----Original Message-----
From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Doug Gregor
Sent: 17 November 2004 15:49
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] Signals & Slots

On Nov 17, 2004, at 9:20 AM, Foster, Gareth wrote:
> I was just reading some mention of bugs in boost::signal,

They weren't actually bugs :)

>  is this
> implementation in competition with libsigc++? i.e. does it aim to do 
> the
> same job, but under a different license, or is there perhaps some
> fundamental design difference between the two?

The Signals library aims to be much more flexible than libsigc++ and to 
have an interface that is more comfortable for Boost. For instance, 
slots are just function objects with similar signatures (like 
Boost.Function, because Function is used in Signals), one can combine 
the results of calling multiple slots into a single return value via an 
arbitrary function object, and the lifetime of signals & slots is 
automatically tied to "trackable" objects used in bind expressions to 
build slots.

Basically, libsigc++ is a monolithic entity covering single and 
multiple-target callbacks, slots, and slot binding, Signals tackles 
only the multiple-target callbacks, relying on other Boost libraries 
(especially Function and Signals) to do most of the work, so it 
integrates cleanly with the rest of Boost.

        Doug

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