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From: AdaMagica <christ-usch.grein@t-online.de>
Newsgroups: comp.lang.ada
Subject: Re: extended membership tests
Date: Thu, 31 Mar 2011 00:34:43 -0700 (PDT)
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Date: 2011-03-31T00:34:43-07:00
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On 31 Mrz., 09:04, Dan <d...@irvine.com> wrote:
> Here's a fun quiz to test your Ada2012 knowledge, based on an
> observation by Yannick Moy.
>
> Consider this Ada 2012 procedure:
>
> with ada.containers.ordered_sets;
> procedure membership is
> =A0 =A0 package int_sets is new ada.containers.ordered_sets(integer);
> =A0 =A0 function "=3D"(x,y: integer) return boolean is begin return true;
> end;
> =A0 =A0 x: integer :=3D 6;
> =A0 =A0 y: integer :=3D 12;
> =A0 =A0 b1: boolean :=3D x in y;
> =A0 =A0 b2: boolean :=3D x in int_sets.to_set(new_item =3D> y);
> begin
> =A0 =A0 null;
> end;

My first reaction was WTF!

But RM 4.5.2 seems to make x in y legal, but false here.

x in y | 1..7

would be true.

b2 is illegal, the simple expression must be of an elementary type.

Hope this is correct.