merging 1.2 branch into main trunk
[ginac.git] / ginac / registrar.cpp
1 /** @file registrar.cpp
2  *
3  *  GiNaC's class registrar (for class basic and all classes derived from it). */
4
5 /*
6  *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22
23 #include <string>
24 #include <map>
25 #include <stdexcept>
26
27 #include "registrar.h"
28
29 namespace GiNaC {
30
31 registered_class_info *first_registered_class = NULL;
32
33 /** Find registered_class_info strucure by class name. */
34 static const registered_class_info *find_registered_class_info(const std::string &class_name)
35 {
36         // Use a map for faster lookup. The registered_class_info list doesn't
37         // change at run-time, so it's sufficient to construct the map once
38         // on the first trip through this function.
39         typedef std::map<std::string, const registered_class_info *> name_map_type;
40         static name_map_type name_map;
41         static bool name_map_initialized = false;
42
43         if (!name_map_initialized) {
44                 // Construct map
45                 const registered_class_info *p = first_registered_class;
46                 while (p) {
47                         name_map[p->name] = p;
48                         p = p->next;
49                 }
50                 name_map_initialized = true;
51         }
52
53         name_map_type::const_iterator it = name_map.find(class_name);
54         if (it == name_map.end())
55                 throw (std::runtime_error("class '" + class_name + "' not registered"));
56         else
57                 return it->second;
58 }
59
60 unsigned int find_tinfo_key(const std::string &class_name)
61 {
62         const registered_class_info *p = find_registered_class_info(class_name);
63         return p->tinfo_key;
64 }
65
66 unarch_func find_unarch_func(const std::string &class_name)
67 {
68         const registered_class_info *p = find_registered_class_info(class_name);
69         return p->unarchive;
70 }
71
72
73 } // namespace GiNaC