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From: artifact.one@googlemail.com
Newsgroups: comp.lang.ada
Subject: Re: C Interface example
Date: 3 Feb 2007 12:57:48 -0800
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Date: 2007-02-03T12:57:48-08:00
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On Feb 3, 8:52 pm, "Jeffrey R. Carter" <jrcar...@acm.org> wrote:
> artifact....@googlemail.com wrote:
> > float *vec_add(float *va, float *vb, unsigned int ne)
> > {
> >   unsigned int ind;
> >   for (ind = 0; ind < ne; ++ind)
> >     va[ind] += vb[ind];
> >   return va;
> > }
>
> > Now what would be the most simple and portable way to write
> > a vector,ads and vector.adb file? (Specification and body, in case
> > those are compiler-specific filenames, I'm not intimate with the
> > Ada language spec yet!). I just don't have a good enough
> > understanding of the language to see how it all fits together
> > yet and I usually learn by example.
>
> I think all of the examples posted so far have some minor problem or
> other in meeting your goal of portability. I'd suggest
>
> with Interfaces.C;
> package C_Vectors is
>     type Vector is array (Positive range <>) of Interfaces.C.C_Float;
>     pragma Convention (C, Vector);
>
>     procedure Add
>        (To : in out Vector; Using : in Vector; Length : in Natural);
> end C_Vectors;
>
> package body C_Vectors is
>     procedure Add
>        (To : in out Vector; Using : in Vector; Length : in Natural)
>     is
>        type C_Ptr is access all Interfaces.C.C_Float;
>        pragma Convention (C, C_Ptr);
>
>        function C_Add
>           (To : Vector; Using : Vector: Length : Interfaces.C.Unsigned)
>        return C_Ptr;
>        pragma Import (C, C_Add, "vec_addNf");
>
>        Result : C_Ptr;
>     begin -- Add
>        Result := C_Add (To, Using, Interfaces.C.Unsigned (Length) );
>     end Add;
> end C_Vectors;
>

Hi.

This is compiler-agnostic, yes?

thanks,
MC