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From: Gautier write-only <gautier_niouzes@hotmail.com>
Newsgroups: comp.lang.ada
Subject: Re: acceess problem
Date: Tue, 26 Jul 2011 08:57:08 -0700 (PDT)
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Date: 2011-07-26T08:57:08-07:00
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On 25 juil, 10:27, Simon Wright <si...@pushface.org> wrote:

> Replace 'Access with 'Unchecked_Access or, if that doesn't work, with
> the (GNAT-special) 'Unrestricted_Access.

Unless 'Unrestricted_Access has been inbetween added to the language,
there is a way to have it in a pure Ada form:

  function Cvt is new
Ada.Unchecked_Conversion(System.Address,DoublePtr);
  -- This method is functionally identical as GNAT's
Unrestricted_Access
  -- but has no type safety (cf GNAT Docs)
  pragma No_Strict_Aliasing(DoublePtr); -- recommended by GNAT 2005

  procedure Vertex (v: Double_vector_3D) is
  begin
    Vertex3dv(Cvt(v(0)'Address));
  end Vertex;

^this is an excerpt from an existing GL binding (why reinvent it?)...
http://globe3d.svn.sourceforge.net/viewvc/globe3d/bindings/gl.adb?revision=152&view=markup

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