luabind/detail/class_registry.hpp

   1 // Copyright (c) 2003 Daniel Wallin and Arvid Norberg
   2
   3 // Permission is hereby granted, free of charge, to any person obtaining a
   4 // copy of this software and associated documentation files (the "Software"),
   5 // to deal in the Software without restriction, including without limitation
   6 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7 // and/or sell copies of the Software, and to permit persons to whom the
   8 // Software is furnished to do so, subject to the following conditions:
   9
  10 // The above copyright notice and this permission notice shall be included
  11 // in all copies or substantial portions of the Software.
  12
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
  14 // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
  15 // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  17 // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  18 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  19 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
  21 // OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23
  24 #ifndef LUABIND_CLASS_REGISTRY_HPP_INCLUDED
  25 #define LUABIND_CLASS_REGISTRY_HPP_INCLUDED
  26
  27 #include <luabind/config.hpp>
  28 #include <string>
  29
  30 namespace luabind { namespace detail
  31 {
  32         class class_rep;
  33
  34         std::string stack_content_by_name(lua_State* L, int start_index);
  35
  36         struct class_registry
  37         {
  38                 class_registry()
  39                         : m_cpp_instance_metatable(LUA_NOREF)
  40                         , m_cpp_class_metatable(LUA_NOREF)
  41                         , m_lua_instance_metatable(LUA_NOREF)
  42                         , m_lua_class_metatable(LUA_NOREF)
  43                 {}
  44
  45                 static inline class_registry* get_registry(lua_State* L)
  46                 {
  47
  48 #ifdef LUABIND_NOT_THREADSAFE
  49
  50                         // if we don't have to be thread safe, we can keep a
  51                         // chache of the class_registry pointer without the
  52                         // need of a mutex
  53                         static lua_State* cache_key = 0;
  54                         static class_registry* registry_cache = 0;
  55                         if (cache_key == L) return registry_cache;
  56
  57 #endif
  58
  59                         lua_pushstring(L, "__luabind_classes");
  60                         lua_gettable(L, LUA_REGISTRYINDEX);
  61                         class_registry* p = static_cast<class_registry*>(lua_touserdata(L, -1));
  62                         lua_pop(L, 1);
  63
  64 #ifdef LUABIND_NOT_THREADSAFE
  65
  66                         cache_key = L;
  67                         registry_cache = p;
  68
  69 #endif
  70
  71                         // luabind::open() is required
  72                         //assert(p);
  73
  74                         return p;
  75                 }
  76
  77                 std::map<LUABIND_TYPE_INFO, class_rep*> classes;
  78
  79                 // this is a lua reference that points to the lua table
  80                 // that is to be used as meta table for all C++ class
  81                 // instances. It is a kind of v-table.
  82                 int m_cpp_instance_metatable;
  83
  84                 // this is a lua reference to the metatable to be used
  85                 // for all classes defined in C++.
  86                 int m_cpp_class_metatable;
  87
  88                 // this is a lua reference that points to the lua table
  89                 // that is to be used as meta table for all lua class
  90                 // instances. It is a kind of v-table.
  91                 int m_lua_instance_metatable;
  92
  93                 // this is a lua reference to the metatable to be used
  94                 // for all classes defined in lua
  95                 int m_lua_class_metatable;
  96
  97         };
  98
  99 }}
 100
 101 #endif // LUABIND_CLASS_REGISTRY_HPP_INCLUDED
 102