|
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
|
|
|
27
|
entity ch_17_09 is
|
|
28
|
|
|
29
|
end entity ch_17_09;
|
|
30
|
|
|
31
|
|
|
32
|
----------------------------------------------------------------
|
|
33
|
|
|
34
|
|
|
35
|
architecture test of ch_17_09 is
|
|
36
|
|
|
37
|
begin
|
|
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
|
|
|
74
|
end architecture test;
|