From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED.3d73Ybk3C5U4I2t8lv+lAQ.user.gioia.aioe.org!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: How to best make a custom range?
Date: Mon, 4 Nov 2019 19:34:45 +0100
Organization: Aioe.org NNTP Server
Message-ID: <qppr05$nml$1@gioia.aioe.org>
References: <fb36f04f-353e-4e35-bd19-eb72d2e78955@googlegroups.com>
NNTP-Posting-Host: 3d73Ybk3C5U4I2t8lv+lAQ.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.9.0
Content-Language: en-US
X-Notice: Filtered by postfilter v. 0.9.2
Xref: reader01.eternal-september.org comp.lang.ada:57469
Date: 2019-11-04T19:34:45+01:00
List-Id: <comp.lang.ada>

On 2019-11-04 18:26, Andrew Shvets wrote:
> Lets say I have the following code:
> 
> subtype Test_Char is Character range ‘A’ .. ‘Z’;
> 
> But what if I wanted to include ‘&’, ‘@‘ and ‘?’ in this custom range of characters as well?

It is not range, it is an arbitrary subset. Differently to a range it 
would lose most of operations, where a range loses only a few.

> Or is this impossible unless I use a different approach?

What do you want from this type? Usually it is is-in test and 
enumeration. For that purpose discrete sets are just OK.

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