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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Creating several types from a base type and conversion
Date: Wed, 22 Jan 2020 15:40:59 +0000
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Date: 2020-01-22T15:40:59+00:00
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Shark8 <onewingedshark@gmail.com> writes:

> On Wednesday, January 22, 2020 at 1:38:02 AM UTC-7, Simon Wright wrote:
>> Shark8 writes:
>> 
>> >    Type Word is range 0..2**30-1
>> >     with Size => 30;
>> >
>> > this allows you to also do something like this:
>> >   Function Convert( Data : Integer ) return Word
>> >     with Inline, Pre => Data in Integer(Word'First)..Integer(Word'Last);
>> 
>> Not sure what advantage this would give over just Word (<integer>)
>
> SPARK Verification, mostly.

Fairly sure that SPARK knows about data ranges.