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[04:21:25] jack-e|away is now known as jack-e
[05:44:35] ** vlado_ has joined us
[07:59:30] ** jack-e has joined us
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[12:31:44] * jack-e quotes vlado: i have a class with two base classes, how do i get their interfaces ?
[12:32:39] <vlado> so what's the answer ?:)
[12:33:02] <jack-e> do you want to get all interfaces that are implemented by a class ?
[12:33:21] <vlado> yes
[12:33:39] <jack-e> i never tried that .. a moment please ..
[12:36:42] <jack-e> i don't know ..
[12:37:15] <jack-e> there don't seem to be introspection features known from zope3 in the protocols packages interface implementation
[12:37:42] <jack-e> perhaps one way would be to use zope3 interfaces package together with peak (never tried that as well)
[12:38:11] <jack-e> why do you need to know the interfaces, can't you just adapt(obj, ISomething, None) ?
[12:39:28] <vlado> probably ..
[12:40:32] <vlado> just wondered is that possible
[12:41:53] <jack-e> i think pje wanted to keep the overhead of using interfaces as small as possible (and the implementation work) 
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[15:06:13] * jack-e is "browsing" the UML/CWM spec with a tool written in peak :))
[15:07:01] * jack-e has worked enough for today .. cu 2morrow
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[18:21:58] ** pje has joined us
[18:22:23] <pje> vlado: you can get the declaration data if your classes implement IOpenImplementor
[18:23:15] <pje> Technically, this is just a way to "listen" to protocol declarations that occur for a given class.
[18:24:11] <pje> There's not really a whole lot of use for it, though, or at least I haven't thought of any.
[18:25:20] <pje> Ordinarily, one just uses adapt, as Ulrich suggested.  And I did want to discourage interface introspection of the "does X implement Y" style.
[18:25:49] <pje> It simplifies code enormously to instead define a *new* interface that you want, and define adapters from interfaces that the subject might possess.
[18:26:04] <pje> And, it's open to extension, since anyone can write an adapter from anything to your new interface.
[18:33:06] <pje> HTH.  Gotta run.
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