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From: Jerry <lanceboyle@qwest.net>
Newsgroups: comp.lang.ada
Subject: Re: How do I "with" Numerics without linking BLAS, LAPACK? (and more)
Date: Tue, 31 Aug 2010 17:05:56 -0700 (PDT)
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Date: 2010-08-31T17:05:56-07:00
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On Aug 31, 1:39=A0am, "J-P. Rosen" <ro...@adalog.fr> wrote:
> Le 31/08/2010 10:24, Jerry a =E9crit :
>
>
>
> > This is probably going to be confusing...
>
> > I have a problem with the PLplot bindings to which I can't figure out
> > a decent solution.
>
> > The Ada bindings use vectors and matrices defined like this:
>
> > =A0 =A0 type Real_Vector is array (Integer range <>) of Long_Float;
> > =A0 =A0 type Real_Matrix is array (Integer range <>, Integer range <>) =
of
> > Long_Float;
>
> > These can be either defined exactly like the above in the bindings
> > proper or, in the case of Ada 2005, from the declarations from GNAT's
> > a-nlrear.ads which are effectively exactly the same. For example,
> > these subtypes work: (Subtyping makes distributing the declaration to
> > the various packages easy.)
>
> > =A0 =A0 with Ada.Numerics.Long_Real_Arrays;
> > =A0 =A0 subtype Real_Vector is Ada.Numerics.Long_Real_Arrays.Real_Vecto=
r;
> > =A0 =A0 subtype Real_Matrix is Ada.Numerics.Long_Real_Arrays.Real_Matri=
x;
>
> > As long as the user program uses whichever of these types is specified
> > in the bindings, the program will work OK. But there are two problems.
>
> > (1) (Compiler is Ada 2005.) [...] if
> > the user simply wants to use the "official" types, the second method
> > is the only way to go because the first declaration style will result
> > in types that are incompatible with a-nlrear.ads.
>
> Not really, since they are convertible to the types in a-nlrear.ads.
> That would require a bit of extra typing when calling the functions, but
> likely zero run-time overhead.
>
> (Array conversions can be quite useful - but few people are aware of
> this possibility).
> --
> ---------------------------------------------------------
> =A0 =A0 =A0 =A0 =A0 =A0J-P. Rosen (ro...@adalog.fr)
> Visit Adalog's web site athttp://www.adalog.fr

Good point. Thanks, J-P. That does give the user program another way
to live with PLplot.
Jerry