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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Why no Ada.Wide_Directories?
Date: Tue, 25 Oct 2011 14:22:27 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2011-10-25T14:22:27-05:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:5279agttaub8.1pl7pt496l1am$.dlg@40tude.net...
> On Fri, 21 Oct 2011 14:53:11 +0200, Yannick Duch�ne (Hibou57) wrote:
>
>> Le Thu, 20 Oct 2011 19:35:21 +0200, Dmitry A. Kazakov
>> <mailbox@dmitry-kazakov.de> a �crit:
>
>>>> What's missing from Interface type introduced with Ada 2005 ?
>>>
>>> 1. Most Ada types do not have interfaces
>> Eiffel has this, and this is 1) not perfect (may lead to performance
>> issue) 2) rarely used in practice
>
> There is no performance loss.

Anytime you have a construct that allows multiple inheritance, there is a 
large performance loss (whether or not you use the multiple inheritance). 
You can move the performance loss from one construct to another (i.e. 
dispatching calls, access types, etc.) but you can't get rid of it. Keep in 
mind that "performance loss" means not just run-time but also space 
efficiency (which is important in a language used mainly in embedded 
systems).

                                             Randy.