Re: Pascal ranges

["(see below)" <yaldnif.w@blueyonder.co.uk>]

On 30/12/2008 23:19, in article wccmyed1cae.fsf@shell01.TheWorld.com,
"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote:

>> .. The need for these closely
>> related subranges is rather smaller in Ada, e.g. thanks to array attributes
>> such as 'First and 'Last.
> 
> I don't understand why you say "need...rather smaller" here.
> I often have two subtypes of the same type, one for counting
> how many there are (0..N), and one for indexing into an array
> of them (1..N).  Like this:
> 
>     type Blah_Index is range 1..N;
>     subtype Blah_Count is Blah_Index'Base range 0..Blah_Index'Last;

Because we could write:

 type Blah_Count is range 0..N;
...  array(Blah_Count range 1..Blah_Count'Last) of ...


-- 
Bill Findlay
<surname><forename> chez blueyonder.co.uk