-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc

-- This file is part of VESTs (Vhdl tESTs).

-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version. 

-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-- for more details. 

-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

-- ---------------------------------------------------------------------
--
-- $Id: ch_17_ch_17_03.vhd,v 1.2 2001-10-26 16:29:36 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------

entity ch_17_03 is

end entity ch_17_03;


----------------------------------------------------------------


architecture test of ch_17_03 is
begin


  process is

            type natural_ptr is access natural;

          -- code from book:

          variable count1, count2 : natural_ptr;

          -- end of code from book

  begin

    -- code from book:

    count1 := new natural'(5);
    count2 := new natural'(10);

    count2 := count1;

    count1.all := 20;

    -- end of code from book

    assert
      -- code from book:
      count1 = count2
      -- end of code from book
      ;

    -- code from book:

    count1 := new natural'(30);
    count2 := new natural'(30);

    -- end of code from book

    assert count1 = count2;

    assert
      -- code from book:
      count1.all = count2.all
      -- end of code from book
      ;

    -- code from book:

    if count1 /= null then
      count1.all := count1.all + 1;
    end if;

    -- end of code from book

    wait;
  end process;


end architecture test;