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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.c++,comp.lang.ada,comp.lang.eiffel,comp.object
Subject: Re: OOP Language for OS Development
Date: Fri, 23 Apr 2004 16:22:27 +0000 (UTC)
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Xref: archiver1.google.com comp.lang.c++:31296 comp.lang.ada:7427
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Date: 2004-04-23T16:22:27+00:00
List-Id: <comp.lang.ada>

In comp.lang.ada Calum <calum.bulk@ntlworld.com> wrote:
 
: I am in no doubt that Eiffel is cleaner safer language, however that's 
: not quite the same as power.
: 
: So what can you express in Eiffel that cannot be expressed in C++? 
: [Actually, resolving name-clashes in multiple inheritance is one, 
: contracts is another.]  But are these fundamentally difficult in C++, or 
: just a little uglier?

How would you write "once" routines in C++?
How about the fine grained visibility control (where each feature
can be made visible to only a specified set of types)?

: 
:>> Can for example Eiffel implement its own allocators, or is its type 
:>> system itself Turing complete (C++ templates)?
:> 
:> 
:> Could you please re-formulate questions about allocators and type 
:> system? I do not understand what you mean, sorry.
: 
: C++ allows you to specify where in memory an object resides.  This is a 
: low-level feature that most people would not use, but gives C-like 
: performance since you can cache-localize data, and implement more 
: efficient memory managers where you know the allocation patterns.
: 
: Are parameterized types in Eiffel as flexible as those in C++?

They are different I think. Can you express

 deferred class C [P -> T]
 feature foo(x: P): P is deferred end
 end -- C

in C++?

Then there is currently a (justified) limitation in C++ with
float parameters. This is not the case in Ada generics.

georg