[Boost Signals & Slots] Vs [libsigc++]

Hello all,

As you will see in the forward email below, I was chatting to a bloke who
works on boost::signal, I wondered how this stacked up against libsigc++,
and whether there was any chance it could be used in GTKmm and suchlike. A
GTKmm developer did pop up on the boost list and make the valid point that
API stability would be a major issue, nevertheless, I thought I'd send this
out, and see what people here had to say. As I said on the boost list, I am
thinking more ...

> "hey, what do you think to this lads" than an outright "you should be
using Boost heathens!"

I hope such discussion isn't offtopic.

Thanks all!


-----Original Message-----
From: boost-users-bounces lists boost org
[mailto:boost-users-bounces lists boost org] On Behalf Of Doug Gregor
Sent: 17 November 2004 15:49
To: boost-users lists boost org
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.


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