1 /**
2 ** Objiter.h - Game objects iterator.
3 **
4 ** Written: 5/27/2002 - JSF
5 **/
6
7 /*
8 Copyright (C) 2002 The Exult Team
9
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License
12 as published by the Free Software Foundation; either version 2
13 of the License, or (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24
25 #ifdef HAVE_CONFIG_H
26 # include <config.h>
27 #endif
28 #include "objiter.h"
29 #include "contain.h"
30 #include "gamewin.h"
31 #include "chunks.h"
32
33 /*
34 * Create to start after/before a given object within a chunk.
35 */
36
37 template<class D>
D_Recursive_object_iterator(Game_object * start)38 D_Recursive_object_iterator<D>::D_Recursive_object_iterator(
39 Game_object *start // Start here.
40 ) : child(nullptr), elems(start->get_outermost()->get_chunk()->get_objects()) {
41 // Get what obj. is in (or itself).
42 Game_object *owner = start->get_outermost();
43 Game_object *obj; // Find owner within its chunk.
44 while ((obj = get_next()) != nullptr && obj != owner)
45 ;
46 if (!obj)
47 return; // Bad. It wasn't found.
48 if (obj != start) // Given object contained?
49 // Look within for it.
50 while ((obj = get_next()) != nullptr && obj != start)
51 ;
52 }
53
54 /*
55 * Get next game object, going down recursively into containers.
56 *
57 * Output: Next in world, or nullptr if done.
58 */
59
get_next()60 template<class D> Game_object *D_Recursive_object_iterator<D>::get_next(
61 ) {
62 Game_object *obj;
63 if (child) { // Going through container?
64 obj = child->get_next();
65 if (obj)
66 return obj;
67 delete child;
68 child = nullptr; // Child done.
69 }
70 obj = elems.get_next(); // Get next from our list.
71 if (!obj)
72 return nullptr; // All done.
73 // Is it a container?
74 Container_game_object *c = obj->as_container();
75 if (c) // Container? Set to go through it.
76 child = new D_Recursive_object_iterator<D>(
77 c->get_objects());
78 return obj;
79 }
80