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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Private discrete type as index
References: <yecy95qmasf.fsf@king.cts.com>
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Xref: archiver1.google.com comp.lang.ada:32943
Date: 2003-01-12T19:48:00+00:00
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>   type x is limited private;
>   type test is array(x) of boolean;
  The "array" abstraction has certain characteristics, among them
sequential indexing.  The object being implemented here is not an array.
If read-only, perhaps it's a function.  For read/write, perhaps a
function returning a pointer would be the syntactically simplest
approach.
  test_object(x).all := not test_object(y).all;
To allow multiple objects, of course, will require an additional
parameter, hidden or not, to distinguish which one.