Re: Pascal ranges

[Robert A Duff <bobduff@shell01.TheWorld.com>]

"(see below)" <yaldnif.w@blueyonder.co.uk> writes:

> Often, yes, it is, but there are cases where one wants to model in Pascal a
> similar kind of relationship as exists between Integer, Natural and
> Positive, but for a more restricted range.

I agree.

>.. 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;

- Bob