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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: oo programing help needed?
Date: Sat, 6 Dec 2003 12:23:38 +0000 (UTC)
Organization: GMUGHDU
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Date: 2003-12-06T12:23:38+00:00
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shoko <shoko2004@hotmail.com> wrote:
: i have the following:
: ------------------------------------------
: package one is
:  type one  is tagged private; 
:  type one_ptr is access all one'class;
:  
:   procedure set_name(name:String;this:in out one);
:  function  get_name(this:one) return string;
:  
:  private
:     type one  is tagged 
:     record
:         name:String(1..256);
:     end record;
:  
:   
: end one ;
...
: -------------------------------------------
: package body three is
:   function get_name(this:three) return string
:     s:string(1..10);
:   begin
:     return s+ this.name;  <-- no selector "name" for type three
:  end get_name;


In the definition of one in package one, you have chosen to
hide .name from view. But then you select a .name component
from within the body of package three, which as a package
is just any package, and thus cannot see the private
part of package one. (You could use get_name in three
because it is not in the private part of one. This might
be a good thing to do anyway as it respects the contract
for dealing with ones using one's public operations.)


-- Georg