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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: [OT] Re: Teaching new tricks to an old dog (C++ -->Ada)
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Date: Tue, 15 Mar 2005 10:12:33 +0100
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Date: 2005-03-15T10:09:04+01:00
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On 14 Mar 2005 16:02:43 -0500, Robert A Duff wrote:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> 
>> It can be formulated in two words: "contract model" is what C++ templates
>> lack.
> 
> Which is both a benefit and a drawback.  C++ templates are somewhat more
> powerful that Ada generics, because of the lack of contract model, and
> implicit instantiation.

I think that the reason is not contracts but inflexible contracts. Ada
formal generic parameters are not ADTs. So there is no way to define a
formal generic type Ordered. Instead of that ADTs are defined ad-hoc:

generic
   type Foo is private;
   function "<" (Left, Right : Foo) return Boolean is <>;
package ...

What is worse is that these ad-hoc ADTs are not named, so in fact it is a
kind of that flawed structural type equivalence reborn.

> But I don't think that addresses Dr. Wrigley's complaint (which applies
> to both Ada and C++).

Indirectly it does, because what he wants is to get more that is in the
contract ... (:-))

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