Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!purdue!ames!elroy!gryphon!sarima
From: sarima@gryphon.COM (Stan Friesen)
Newsgroups: comp.lang.c++
Subject: Re: objective C
Message-ID: <15327@gryphon.COM>
Date: 30 Apr 89 17:21:04 GMT
References: <2614@ssc-vax.UUCP> <3180@stpstn.UUCP>
Reply-To: sarima@gryphon.COM (Stan Friesen)
Organization: Trailing Edge Technology, Redondo Beach, CA
Lines: 32

In article <3180@stpstn.UUCP> cox@stpstn.UUCP (Brad Cox) writes:
>
>Sorry I'm late in responding to your article. I monitor this network
>very irregularly these days.
>
	DITTO

>Of course, none of this answered your real question...why highly
>reusable software (Software-ICs is a trademark...it applies STRICTLY to
>Objective-C, by law) is harder  in C++ (never impossible...remember I
>used to do this stuff in raw C too).  The short answer is that C++
>relies on static binding and strong type-checking, while reusing code
>involves binding a supplier's code with a consumer's code long after
>the supplier's code has been compiled (and therefore bound to whatever
>types the supplier knew about at the time...which fails to include the
>consumers').  For the longer answer, read the book
>again...closely...and try working the examples in C++.

	This seems to be a common mistake of less intensive C++ programmers.
C++ does not *rely* on static binding, it *permits*, or perhaps *encourages*
it, but definitely not rely!   Dynamic binding in trivially available, it is
called "virtual functions".   Of course since all "functions/messages" are
"virtual" in ObjC, attempting to code any ObjC class that relies on library
classes in C++ would require writing the associated library using virtual
functions.  But I do not see any other problem that would prevent the
example from being done in C++.  Admittedly, ObjC is more advanced in its
standard library of predefined classes, but that is its only real advantage
over C++.
-- 
Sarima Cardolandion			sarima@gryphon.CTS.COM
aka Stanley Friesen			rutgers!marque!gryphon!sarima
					Sherman Oaks, CA