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From: Hyman Rosen <hyrosen@mail.com>
Subject: Re: OOP Language for OS Development
Date: Fri, 23 Apr 2004 12:45:47 -0400
Date: 2004-04-23T12:45:47-04:00	[thread overview]
Message-ID: <1082738747.300309@master.nyc.kbcfp.com> (raw)
In-Reply-To: <c6bfs3$ed7$1@a1-hrz.uni-duisburg.de>

Georg Bauhaus wrote:
> How would you write "once" routines in C++?

With a static method containing a static value, of course.

class UponATime
{
     static double Once(/* args */)
     {
         static double value = /* some calculation */;
         return value;
     }
};

It appears from my looking up what once functions do,
that arguments to the call are irrelevant for determining
whether it should be re-executed. If so, that's another
example of a hideous language design choice made by Eiffel.

> How about the fine grained visibility control (where each feature
> can be made visible to only a specified set of types)?

Speaking of hideous design decisions. This whole concept
of classes having fine-grained dictatorial control over
whom they allow access to their innards is more than a
little silly.

> 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++?

Sure. You just don't define the method, and if it gets used,
the linker will complain. Or if it's virtual, then you can
make it abstract.

template <typename T>
struct C
{
     T foo(T x);
     virtual T bar(T x) = 0;
};





  reply	other threads:[~2004-04-23 16:45 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-04-15  5:53 OOP Language for OS Development KingIshu
2004-04-15  8:02 ` Martin Krischik
2004-04-15 12:25 ` Ioannis Vranos
2004-04-15 12:49   ` Ioannis Vranos
2004-04-15 12:39 ` Thomas Gagné
2004-04-15 14:32 ` jeffc
2004-04-15 14:45 ` Luke Guest
2004-04-17 16:30 ` Ender Everett
2004-04-19  1:53 ` EventHelix.com
2004-04-19  7:25   ` Martin Krischik
2004-04-19  8:35   ` Jean-Pierre Rosen
2004-04-19  9:16     ` Ioannis Vranos
2004-04-19 11:15       ` Jean-Pierre Rosen
2004-04-19 11:32       ` Martin Krischik
2004-04-19 17:36       ` Christopher Benson-Manica
2004-04-19 11:09   ` Philippe Ribet
2004-04-22  7:34     ` Calum
2004-04-22 10:48       ` John English
2004-04-23  8:36       ` Philippe Ribet
2004-04-23  9:55         ` Calum
2004-04-23 14:30           ` Steven Wurster
2004-04-23 15:04             ` Hyman Rosen
2004-04-23 22:08               ` Brian_Heilig
2004-04-23 22:33                 ` Hyman Rosen
2004-04-24 12:53                   ` Robert C. Martin
2004-04-25  1:25                     ` Steven Wurster
2004-04-25 12:30                       ` Robert C. Martin
2004-04-24 19:58                   ` Anthony Weissenberger
2004-04-25  2:24                     ` Hyman Rosen
2004-04-24  0:01               ` Steven Wurster
2004-04-24 15:27             ` JKop
2004-04-24 21:41               ` Greg C
2004-04-24 22:17               ` Steven Wurster
2004-04-29 17:43               ` Brian_Heilig
2004-04-23 16:22           ` Georg Bauhaus
2004-04-23 16:45             ` Hyman Rosen [this message]
2004-04-23 20:13               ` Georg Bauhaus
2004-04-23 21:18                 ` Hyman Rosen
2004-04-24 10:33                   ` Georg Bauhaus
2004-04-25  2:27                     ` Hyman Rosen
2004-04-23 23:03               ` Brian_Heilig
2004-04-25  2:42                 ` Hyman Rosen
2004-05-04 18:37                   ` Dr Chaos
2004-05-05 11:58                   ` Ged
2004-05-05 12:28                     ` Thomas Gagné
2004-05-06  9:35                       ` Ged
2004-04-24  0:10               ` Steven Wurster
2004-04-25  2:37                 ` Hyman Rosen
2004-04-24  1:00 ` Brian_Heilig
2004-04-26  3:43   ` Berend de Boer
2004-04-26  4:17     ` Christopher Browne
2004-04-26 21:52       ` Berend de Boer
2004-05-04  4:14     ` Richard  Riehle
2004-05-04 21:15       ` Berend de Boer
2004-04-28 19:53   ` Philippe Ribet
2004-04-29  8:32     ` Georg Bauhaus
2004-04-30 17:48       ` Philippe Ribet
2004-04-29 17:39     ` Brian_Heilig
     [not found]       ` <1402879.WneVss6BD6@linux1.krischik.com>
     [not found]         ` <ba03b545.0404300503.376243c8@posting.google.com>
     [not found]           ` <c6tk6v$amm$1@news.BelWue.DE>
2004-04-30 13:46             ` Preben Randhol
2004-04-30 19:30             ` Steven Wurster
2004-04-24 22:09 ` Thomas Gagné
2004-04-25  2:17   ` Hyman Rosen
2004-04-25 16:31     ` Alexander E. Kopilovich
2004-04-25 16:58     ` Isaac Gouy
2004-04-26  0:01       ` Cesar Rabak
2004-04-26  6:14         ` Isaac Gouy
2004-04-26  2:06       ` Thomas Gagné
2004-04-25 16:29   ` Alexander E. Kopilovich
2004-04-26  4:17   ` Christopher Browne
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