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From: Laurent Guerby <guerby@acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Ok sorry, it is just a book gives no feedback.
Date: 06 Jan 2001 20:46:13 +0100
Organization: Club-Internet (France)
Message-ID: <86hf3c5ure.fsf@acm.org>
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Date: 2001-01-06T19:43:47+00:00
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"Randy Brukardt" <randy@rrsoftware.com> writes:
> Indeed, that is why pragma Pure is so hard to use in practice: because
> you can't instrument or otherwise debug code controlled by it. About all
> you can do is remove the pragma, but that often makes the clients of the
> package illegal. Thus debugging these things can be horrible.

The trick is to use pragma Import in Pure units to import "unpure"
debugging stuff without withing it.

package body Of_Pure_Unit
   procedure Dbg (Msg : in String);
   pragma Import (Ada, Dbg); 
   -- May need compiler tweaking with link names, plus of course
   -- a matching Export somewhere in the code.

   function Not_That_Pure return Integer is
   begin
      Dbg ("hello!");
      return 0;
   end Not_That_Pure;

end Of_Pure_Unit;

-- 
Laurent Guerby <guerby@acm.org>