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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Fri, 10 May 2013 15:54:40 +0200
Organization: cbb software GmbH
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Date: 2013-05-10T15:54:40+02:00
List-Id: <comp.lang.ada>

On Fri, 10 May 2013 14:40:00 +0200, Yannick Duchêne (Hibou57) wrote:

> Le Fri, 10 May 2013 14:15:35 +0200, Dmitry A. Kazakov  
> <mailbox@dmitry-kazakov.de> a écrit:
>>> If so, that's indeed be true, as the program can then
>>> be derived, but there is not a single possible derivation, there are
>>> typically multiple solutions, so the program still requires human
>>> intervention to be generated.
>>
>> Human intervention is needed to handle the semantics, not because of
>> multiplicity of implementations. You could choose them randomly.
> 
> You can't choose randomly, the program must have runtime properties as  
> well.

The only properties a program must have are derived from its semantics, per
definition.

>>> With this kind of formal system, you typically go from a specification  
>>> and derives a program.
>>
>> That won't work. If you can derive the program (in the object language)  
>> you don't need the object language anymore.
> 
> You really can't say “it won't work”, since there are people who already  
> do this,

That is their problem. People do crazy things all the time.

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