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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Is this expected behavior or not
Date: Wed, 13 Mar 2013 21:28:03 +0000
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Date: 2013-03-13T21:28:03+00:00
List-Id: <comp.lang.ada>

"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On Wed, 13 Mar 2013 19:54:22 +0000, Simon Wright wrote:
>
>> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>> 
>>> On Wed, 13 Mar 2013 17:45:56 +0000, Simon Wright wrote:
>>>
>>>> I don't remember ever using 'Pred/'Succ,
>>>
>>> Even in:
>>>
>>> generic
>>>    type Discrete is (<>);
>>> package Foo is
>> 
>> Nope.
>> 
>> Out of over 200 packages I have only one with this construct: it is a
>> signature package, no need for 'Pred or 'Succ (in other words, the
>> enumeration defines a set of distinct possibilities, ordering
>> irrelevant).
>
> You need (<>) as an ancestor of both mod <> and range <> in packages
> that should be instantiated with either integer or modular type.

I don't understand this.

Anyway, as I said, only 0.5% of the packages I have written (and that I
have on this machine) have a formal discrete type definition, and
'Pred/'Succ were irrelevant for that one.