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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Is this expected behavior or not
Date: Thu, 14 Mar 2013 10:16:05 +0100
Organization: cbb software GmbH
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Date: 2013-03-14T10:16:05+01:00
List-Id: <comp.lang.ada>

On Wed, 13 Mar 2013 21:28:03 +0000, Simon Wright wrote:

> "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.

Let you have a generic package you wanted to be able o instantiate with
either Unsigned_16 or Integer. The formal generic type for that is formal
discrete. E.g.

generic
   type Index_Type is (<>);
   type Element_Type is private;
package Generic_Array is ...

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de