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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Generic-Package Elaboration Question / Possible GNAT Bug.
Date: Fri, 25 Nov 2011 10:54:50 +0100
Organization: cbb software GmbH
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Date: 2011-11-25T10:54:50+01:00
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On Thu, 24 Nov 2011 15:45:10 +0100, Georg Bauhaus wrote:

> On 24.11.11 13:52, Dmitry A. Kazakov wrote:
>> On Thu, 24 Nov 2011 12:30:46 +0100, Georg Bauhaus wrote:
>> 
>>> On 24.11.11 11:52, Dmitry A. Kazakov wrote:
>>>
>>>>> The typical example is a stack and its contract referring to
>>>>> values available at runtime: from the contract, I learn that a stack
>>>>> is initially empty and has a certain capacity.
>>>>
>>>> What is dynamic there?
>>>
>>> Its initial capacity, as outlined in another post.
>> 
>> You wrote about certain capacity, that is static.
> 
> The certainty of an initial capacity is static, its value
> isn't,

Therefore that value cannot be contracted upfront. You can only contract a
range of values, which is static.

>>> One may continue with current_number_of_items and such.
>> 
>> Same here, the contract that Push does not raise if n < N is static.
> 
> Ehr, yes, the contract guides programmers and the check may be
> performed at run-time ...

Unknown things cannot guide.

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