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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: S-expression I/O in Ada
Date: Mon, 09 Aug 2010 13:05:55 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2010-08-09T13:05:55-04:00
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Georg Bauhaus <rm.dash-bauhaus@futureapps.de> writes:

>> 7. No array index of
>
> These refer to arrays in general, not Boolean arrays as sets and,
> I guess, the item numbered 7 follows a general rule:
> Where the array type is visible, its index type is
> visible.  (Or else, you have been too lazy and used
> an anonymous index type; still, you have 'first etc.)
> Therefore, the index type can be named without
> indirection, that is, via some array attribute function.
> (Or else, index values can be made from 'first etc.)
> Array access will be type checked either way.

I think Dmitry was complaining in 7 that you can't do this:

    type Bit_Map is array(...) of Boolean;
    type T is array (Bit_Map) of Something; -- Illegal index type.

whereas if Bit_Map is modular then you CAN do that.

You can, but only if the number of bits is small.

- Bob