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From: Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: SPARK : third example for Roesetta - reviewers welcome
Date: Sun, 15 Aug 2010 14:40:12 -0700
Organization: Netfront http://www.netfront.net/
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Xref: g2news1.google.com comp.lang.ada:13366
Date: 2010-08-15T14:40:12-07:00
List-Id: <comp.lang.ada>

On 08/15/2010 01:19 PM, Yannick Duch�ne (Hibou57) wrote:
>
> --# pre
> --# (Source'Length = 0) or else
> --# (for all I in Index_Type range Source'First .. Source'Last - 1
> --# => (Source (I) <= Source (I + 1)));
> -- The array must be either empty or sorted from lower to higher.

Is this correct? Consider the case where Source'Length = 1. In that case, the 
range in the "for all" is null; does that evaluate to True? If not, then it 
needs to be

Source'Length < 2 or else (for all ...)

Even if it is correct as written, it may be misleading to non-Ada readers (whom 
we want to impress on Rosetta) who might think it implies an out-of-range access.

-- 
Jeff Carter
"Son of a window-dresser."
Monty Python & the Holy Grail
12

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