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Date: Wed, 09 Mar 2005 16:55:38 +0100
From: Georg Bauhaus <bauhaus@futureapps.de>
Organization: future apps GmbH
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Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
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Date: 2005-03-09T16:53:56+01:00
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Ed Falis wrote:
> On 09 Mar 2005 15:55:38 +0100, Pascal Obry <pascal@obry.org> wrote:
> 
>>> Can you program "const correct"? 

> Ada does not support the idea of a const reference, though: if the  
> function parameter is of an access type, or mode "access", the 
> reference  to the object cannot be changed, but the contents of the 
> referenced object  can be.

Although with "access constant" types, a similar idea is supported:

   type R is record
      v: Natural;
   end record;

   type CP is access constant R;

   procedure proc(t: CP) is
   begin
      t.v := 4;
   end proc;

$ compiling...

    23.       t.v := 4;
              |
        >>> left hand side of assignment must be a variable

Georg