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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 19:54:22 +0000
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Date: 2013-03-13T19:54:22+00:00
List-Id: <comp.lang.ada>

"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).

   generic

      --  This package specifies the properties required of a Time for it
      --  to be used with event management.

      type Time_Kind is (<>);

      --  One of the kinds of Time must be Real_Time, used for "delay for".
      Real_Time : Time_Kind;

      type Time (Kind : Time_Kind) is private;

      with function From_Now (Period : Duration) return Time;

      with function Image (Of_Time : Time) return String;
      --  Used in logging versions of Event Queues.

   package ColdFrame.Time_Signature is
   end ColdFrame.Time_Signature;