4 // Copyright (C) 2004 Ricardo Cruz <rick2@aeiou.pt>
5 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 2
10 // of the License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #ifndef OBJECT_FACTORY_H
21 #define OBJECT_FACTORY_H
26 namespace lisp { class Lisp; }
36 /** Creates a new gameobject from a lisp node.
37 * Remember to delete the objects later
39 virtual GameObject* create_object(const lisp::Lisp& reader) = 0;
41 typedef std::map<std::string, Factory*> Factories;
42 static Factories &get_factories()
44 static Factories object_factories;
45 return object_factories;
49 GameObject* create_object(const std::string& name, const lisp::Lisp& reader);
50 GameObject* create_object(const std::string& name, const Vector& pos);
52 /** comment from Matze:
53 * Yes I know macros are evil, but in this specific case they save
54 * A LOT of typing and evil code duplication.
55 * I'll happily accept alternatives if someone can present me one that does
56 * not involve typing 4 or more lines for each object class
58 #define IMPLEMENT_FACTORY(CLASS, NAME) \
59 class INTERN_##CLASS##Factory : public Factory \
62 INTERN_##CLASS##Factory() \
64 get_factories()[NAME] = this; \
67 ~INTERN_##CLASS##Factory() \
69 get_factories().erase(NAME); \
72 virtual GameObject* create_object(const lisp::Lisp& reader) \
74 return new CLASS(reader); \
77 static INTERN_##CLASS##Factory factory_##CLASS;