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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: status of Ada STL?
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Date: Tue, 18 Jun 2002 18:56:43 GMT
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Date: 2002-06-18T18:56:43+00:00
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Pascal Obry <p.obry@wanadoo.fr> writes:

> What about this, the use here is not possible:
> 
> package P is
>    X : Integer;
> end P;
> 
> with P;
> procedure P2 is
> 
>    P : Integer;
> 
>    procedure Proc is
>       -- use P;            <- this is not possible because P integer
>       V : Integer;
>    begin
>       V := Standard.P.X;   <- and you need full qualified name
>    end Proc;
> 
> begin
>    null;
> end P2;

I'm not sure what the point of this example is, other than that one can
write obscure code.  You're right that "use P;" would be illegal there
(although "use Standard.P;" would be legal).  So?  The right thing to do
is change the name of one of those P's.

(I would disallow hiding altogether, if I ran the show.)

> Also all the "with" are in the same places, easy to find, but "use"
> can be put in any part of the code. And you certainly don't want to
> "use" all packages, right ? All symbols visible ?

No.  I don't know what Russ meant, but I meant that "use" in a context
clause would imply a "with".  A "use" anywhere else would not (thus
preserving the property that all the imported packages are mentioned at
the top).

- Bob