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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: ada lapack
Date: Sat, 18 Aug 2012 18:32:10 +0100
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Date: 2012-08-18T18:32:10+01:00
List-Id: <comp.lang.ada>

Ada novice <shai.lesh@gmx.com> writes:

> I hope that someone can come up with a solution to this problem. It's
> unblievable that one has to "reinvent the wheel". Of course in the
> same program, one would want to be able to mix the lapack codes with
> those of Ada numerics seamlessly.

The types from Ada.Numerics are convention Ada by default, while the
types in Ada_Lapack are convention Fortran.

It would be nice to be able to say something like

   with Ada.Numerics.Generic_Complex_Arrays;

   generic
      with package Complex_Arrays
         is new Ada.Numerics.Generic_Complex_Arrays (<>);
   package Conventions is

      type Complex_Matrix
      is new Complex_Arrays.Complex_Matrix with Convention => Fortran;

which would give you the operations you want, but unfortunately

   gcc -c -gnat12 conventions.ads
   conventions.ads:9:46: representation item appears too late
   conventions.ads:9:46: primitive operations already defined for "Complex_Matrix"
   gnatmake: "conventions.ads" compilation error

> It's definitely an issue that Ada programmers need to look into if we
> would like to attract people to use Ada.

Who are these "Ada programmers"? Looks to me as though it's you, Leo and
Nasser!