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Date: Thu, 24 Nov 2011 15:45:10 +0100
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: Generic-Package Elaboration Question / Possible GNAT Bug.
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Date: 2011-11-24T15:45:11+01:00
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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, so the check cannot, in general, be performed until
run-time. Perhaps in special cases whole program analysis
can move the check to compile time.
(Also, http://www.merriam-webster.com/dictionary/certain)


>> 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 ...