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From: cosc19z5@Bayou.UH.EDU (Spasmo)
Subject: Re: Ada95 OOP Questions
Date: 1996/08/04
Message-ID: <4u1umo$6q7@Masala.CC.UH.EDU>#1/1
X-Deja-AN: 171982191
references: <4tf3l4$4hu@masala.cc.uh.edu>
 <lhmspac4law.fsf@berlin.berlin.informatik.uni-stuttgart.de>
 <4tgi88$5fi@Masala.CC.UH.EDU> <31FE03CB.7B74@lmtas.lmco.com>
organization: University of Houston
newsgroups: comp.lang.ada
Date: 1996-08-04T00:00:00+00:00
List-Id: <comp.lang.ada>


Ken Garlington (garlingtonke@lmtas.lmco.com) wrote:
: Spasmo wrote:

[Snip]

: Depends on what you're abstrating. If you don't want an abstract data type,
: but you want a generic abstract data object, why not do this:

:   generic
:   package Person is

:     procedure Walk;
:     procedure Talk;
:     procedure Eat;

:   private

:     type Person_Type is -- as before
:     Object : Person_Type;

:   end Person;

: Translating your C++ code:

:    package P is new Person;  -- Person p;
:    P.Walk;                   -- p.walk();
:    P.Talk;                   -- p.talk();
:    P.Eat;                    -- p.eat();

: Note, however, that there are things you can't do with a GADO (like
: make an array of Persons) that you can do with an ADT.

Yeah that's something I fiddled with initially but realized
that it just didn't work with arrays and the like.  Sure I
could arbitrarily create as many instances of the above package
as I liked (via new packages) but I couldn't use arrays, linked
lists of them, etc...



: If your complaint is that you like p.eat() better than eat(p), on the
: other hand, then I don't see this as an abstraction difference - just
: a syntax difference.

Right it was the syntax that got to me -- and I came to grips
with that :).


: Just out of curiousity, if Person is declared in the C++ equivalent of
: a package (and I forget the nomenclature -- space?), what does your C++
: code look like?

Well when I used C++, things like namespaces, RTTI (standardized?)
and even exception handling weren't universally implemented so
in all reality these classes were taking up the global name space.



: -- 
: LMTAS - "Our Brand Means Quality"

--
Spasmo
"Everyone has secrets, but sometimes you get caught,
 So if it's just between us, my silence can be bought"
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