1
2-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
3
4-- This file is part of VESTs (Vhdl tESTs).
5
6-- VESTs is free software; you can redistribute it and/or modify it
7-- under the terms of the GNU General Public License as published by the
8-- Free Software Foundation; either version 2 of the License, or (at
9-- your option) any later version.
10
11-- VESTs is distributed in the hope that it will be useful, but WITHOUT
12-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14-- for more details.
15
16-- You should have received a copy of the GNU General Public License
17-- along with VESTs; if not, write to the Free Software Foundation,
18-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19
20-- ---------------------------------------------------------------------
21--
22-- $Id: ch_17_ch_17_09.vhd,v 1.2 2001-10-26 16:29:36 paw Exp $
23-- $Revision: 1.2 $
24--
25-- ---------------------------------------------------------------------
26
27entity ch_17_09 is
28
29end entity ch_17_09;
30
31
32----------------------------------------------------------------
33
34
35architecture test of ch_17_09 is
36
37begin
38
39  process is
40
41            type value_cell;
42
43          type value_ptr is access value_cell;
44
45          type value_cell is record
46                               value : bit_vector(0 to 3);
47                               next_cell : value_ptr;
48                             end record value_cell;
49
50          variable value_list, cell_to_be_deleted : value_ptr;
51
52  begin
53    value_list := new value_cell'( B"1000", value_list );
54    value_list := new value_cell'( B"0010", value_list );
55    value_list := new value_cell'( B"0000", value_list );
56
57    -- code from book:
58
59    cell_to_be_deleted := value_list;
60    value_list := value_list.next_cell;
61    deallocate(cell_to_be_deleted);
62
63    while value_list /= null loop
64      cell_to_be_deleted := value_list;
65      value_list := value_list.next_cell;
66      deallocate(cell_to_be_deleted);
67    end loop;
68
69    -- end of code from book
70
71    wait;
72  end process;
73
74end architecture test;
75