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NNTP-Posting-Date: Thu, 30 Jun 2005 13:56:13 -0500
From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
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 <42c40313$0$32193$39cecf19@news.twtelecom.net>
Subject: Re: How difficult is ada to learn?
Date: Thu, 30 Jun 2005 13:59:20 -0500
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Date: 2005-06-30T13:59:20-05:00
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"Matthew Heaney" <mheaney@on2.com> wrote in message
news:42c40313$0$32193$39cecf19@news.twtelecom.net...
Matt Heaney wrote:

> If not having "built-in" syntax is a hardship, then you can always
> define array-based set operations yourself.  For example, suppose we
> have a set whose element type is Integer, then we can do this:

The following example seems pretty confused.

> type Integer_Array is array (Positive range <>) of Integer;
>
> function "+" (IA : Integer) return Integer_Sets.Set is

What's the definition of "Integer_Sets.Set"? Shouldn't IA have type
Integer_Array, rather than Integer?

>    S : Set;
> begin
>    for Indx in IA'Range loop
>       S.Include (IA (Indx));
>    end loop;
>
>    return S;
> end;
>
> Now you can say:
>
> declare
>     S1 : Set := +(1, 2, 3);
>     S2 : Set := +(2, 3, 4);
>     S3 : Set := S1 or S2;
>     S4 : Set := S3 and +(1, 3);
>     S5 : Set := +(42, 43) or +(44, 45);

Presuming that Integer_Sets.Set has "or" and "and" operations.

                            Randy.