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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Is this a bug in Ada.Numerics?
Date: Sun, 21 Oct 2012 03:54:28 +0200
Organization: Ada @ Home
Message-ID: <op.wmh982j7ule2fv@cardamome>
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Date: 2012-10-21T03:54:28+02:00
List-Id: <comp.lang.ada>

Hi,

Just reading your snippet (not tried to compile)

Le Sun, 21 Oct 2012 02:37:36 +0200, Leo Brewin  =

<leo.brewin@internode.on.net> a =C3=A9crit:

> In the course of my dabblings in Ada I've come across a curious  =

> "behaviour" that seems to me, with my limited knowledge of Ada, to be =
a  =

> bug.
>
> Here is a simple package spec
>
>    with Ada.Numerics.Generic_Complex_Types;
>    with Ada.Numerics.Generic_Complex_Elementary_Functions;
>
>    package foo is
>
>       type Real is digits 18;
> 		=

>       package Complex_Types is new
>          Ada.Numerics.Generic_Complex_Types (Real);
>
>       use foo.Complex_Types;
>       -- subtype Complex is foo.Complex_Types.Complex;
>      procedure bar (z : in out Complex);
>   end foo;

When you do =E2=80=9Cuse foo.Complex_Types;=E2=80=9D, you introduce from=
 then in the  =

current scope, all definitions from =E2=80=9Cfoo.Complex_Types=E2=80=9D.=
 (by the way, you  =

don't need =E2=80=9Cuse foo.Complex_Types;=E2=80=9D, as =E2=80=9Cuse Com=
plex_Types;=E2=80=9D would be  =

enough). This means that =E2=80=9Cfoo.Complex_Types.Complex=E2=80=9D [1]=
 is introduced in  =

the scope, so there is a clash with the subtype you define right after. =
 =

May be you did not understood what exactly =E2=80=9Cuse=E2=80=9D do?

[1] See [G.1.1 Complex  =

Types](http://www.adaic.org/resources/add_content/standards/05rm/html/RM=
-G-1-1.html),  =

which contains the following:

     type Complex is [=E2=80=A6]


> and the package body
>
>    package body foo is
>
>       package Complex_Maths is new
>          Ada.Numerics.Generic_Complex_Elementary_Functions  =

> (Complex_Types);
>      procedure bar (z : in out Complex) is
>       begin
>          z :=3D Complex'(Re(z),0.0);
>       end bar;
>
>    end foo;

Not part of the case, but here, you are instantiating a generic package =
 =

which you don't use (must be an error).


-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity