Re: [sigc] Re: [Boost-users] Signals & Slots

On Nov 21, 2004, at 8:09 PM, Carl Nygard wrote:

On Sun, 2004-11-21 at 14:26, Murray Cumming wrote:
On Sat, 2004-11-20 at 15:58 -0500, Carl Nygard wrote:
2. libsigc++2 uses sigc::signal<>, not sigc::signal[1/2/3/4/5]<>.

Yup, and Boost.Signal has signal<void (float, string)> notation as
well.  I was trying to keep the examples as identical as possible to
show commonalities, but I'll make a note.

The API here seems to be different, so it would be useful to show that.

I don't think anybody is interested in using some secondary API
(probably semi-internal API) just because that API is similar in both
libsigc++ and Boost.Signal.

Sorry, I thought the reason for the comparisons was as a first step for
C++ standard library, so I figured the analysis should concentrate on
underlying implementation instead of syntactic conveniences... although
those conveniences go a long way toward making the library usable. I'll
update the docs...


We should compare the "best" interfaces of both libraries, because we want to have the best interface to present to the C++ committee. For Boost.Signals, that's the "boost::signal<void(float x, string s)>" interface.

As for the interface vs. implementation question... the C++ committee is interested in interfaces and their semantic descriptions, only. Having an implementation is important to validate the interface (having two implementations is, of course, much better!), but implementation details need not be discussed. They do come into play when we talk about the best semantics we can get... for instance, whether disconnecting a slot is O(1) or O(lg n), etc.


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