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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: How to include vector operators?
Date: Mon, 6 Dec 2010 13:37:42 -0800 (PST)
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Date: 2010-12-06T13:37:42-08:00
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On Dec 6, 1:03=A0pm, tolkamp <f.tolk...@gmail.com> wrote:
> In my application the package Ada.Numerics.Generic_Real_Arrays =A0is
> included.
>
> Code:
>
> with Ada.Numerics.Generic_Real_Arrays;
> package Vectors is new Ada.Numerics.Generic_Real_Arrays(Float);
>
> How to include the vector operators like "+" and "-" ?
>
> I tried the follwing:
> function "+" (Left, Right : Vectors.Real_Vector) return
> Vectors.Real_Vector
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0renames
> Ada.Numerics.Generic_Real_Arrays.Instantiations."+";
>
> However this gives the error:
> invalid prefix in selected component "Generic_Real_Arrays".

function "+" (Left, Right : Vectors.Real_Vector) return
Vectors.Real_Vector
   renames Vectors."+";

But you probably really want to use this, which will make all the
operators visible:

   use type Vectors.Real_Vector;

(and maybe the same for Real_Matrix).

But NOT this:

   use type Ada.Numerics.Generic_Real_Arrays.Real_Vector;

You can't access declarations in a generic package directly.  You have
to access the declarations in a generic *instance*.

                                -- Adam