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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
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Subject: Re: class wide iterable (and indexable)
Date: Thu, 3 Jan 2019 17:45:44 +0100
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On 1/3/19 10:30 AM, George Shapovalov wrote:
>> ARM A.18.2(34.3)ff[1] has both forms.
> Ah, thank you for the pointer. Unfortunately ARM is a rather heavy reading, targeted more at language implementation (so, not the first place to look at if there are other sources). But I guess I enter this territory already while trying to reimplement indexing and iteration..

This is true of much of the ARM, but not of Annex A, which is required reading 
for anyone using Ada.

-- 
Jeff Carter
"Of course, one couldn't think properly in Paris--
it was so uncomfortable and the houses were
central heated."
Clouds of Witness
153