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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Callback in Ada
Newsgroups: comp.lang.ada
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Date: Sat, 27 Nov 2010 11:11:26 +0100
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Date: 2010-11-27T11:11:23+01:00
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On 27 Nov 2010 09:47:12 GMT, Georg Maubach wrote:

> How would I do that in Ada?

   type Integer_Array is array (Positive range <>) of Integer;
   procedure Apply
             (  Action : not null access procedure
                          (Value : in out Integer);
                To : in out Integer_Array
             )  is
   begin
      for Index in To'Range loop
         Action (To (Index));
      end loop;
   end Apply;
   
   procedure Double (Value : in out Integer) is
   begin
      Value := Value * 2;
   end Double;

Used as:

   List : Integer_Array := (1,2,3,4,5);
begin
   Apply (Double'Access, List);

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de