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From: Stefan Lucks <lucks@th.informatik.uni-mannheim.de>
Newsgroups: comp.lang.ada
Subject: Re: What is the best way to define the Imported C function
Date: Sat, 26 Jan 2008 13:15:31 +0100
Organization: InterNetNews at News.BelWue.DE (Stuttgart, Germany)
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Date: 2008-01-26T13:15:31+01:00
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On Sat, 26 Jan 2008, Dmitry A. Kazakov wrote:

> Surely, you would like to make a wrapper around the mess to make it more
> Ada-friendly:

Such a wrapper looks like a typical "please inline me" function:

>   type Display_ID is private; -- An opaque handle to
>   type Screen_ID is private;
>      -- This either does the job or raises an exception
>   procedure Parse_Display ( [...] );
     pragma inline (Parse_Display); -- *** this seems to make sense ***

> private
> ...
> procedure Parse_Display ( [...] )  is
>   function Internal ( [...] )  return Interfaces.C.int;
>   pragma Import (C, Internal, "xcb_parse_display");
     [...]
>   Result        : Interfaces.C.int := Internal ( [...] );
> begin
>   if Result = 0 then
       [...]
>   else
>     raise [...];
>   end if;
> end Parse_Display;


-- 
Stefan Lucks      (moved to Bauhaus-University Weimar, Germany)
 		       <Stefan.Lucks at medien.uni-weimar.de>
------  I  love  the  taste  of  Cryptanalysis  in  the  morning!  ------