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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.c++,comp.lang.ada
Subject: Re: Why use C++?
Date: Tue, 16 Aug 2011 10:47:07 +0200
Organization: cbb software GmbH
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Date: 2011-08-16T10:47:07+02:00
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On Tue, 16 Aug 2011 01:18:31 -0700 (PDT), Nick Keighley wrote:

>> 2. I don't care about the platform, I care about what the program is
>> supposed to do. The type's properties shall be defined by the application
>> domain.
> 
> whilst this degree of abstraction is often good the ability to fiddle
> with representaion is also sometimes useful.

Never. It is a strong claim, but it holds. The cases of which you believe
you have to handle the type's layout, are those where the *application*
domain is the machine hardware itself. There exist such rare cases, but
they represent no exception to what I said.

> And if we want our
> programs to terminate before the sun goes cold knowing about
> representaion is sometimes useful.

A premature optimization does not guaranty you anything about performance,
in fact the opposite. Unless your claim is that a deliberate use of a wrong
representation (e.g. shorter than required) might result in a better
performance, due to malfunction.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de