luabind/com_policy.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 #ifndef LUABIND_COM_POLICY_HPP_INCLUDED
  24 #define LUABIND_COM_POLICY_HPP_INCLUDED
  25
  26 #include <luabind/config.hpp>
  27 #include <luabind/detail/policy.hpp>
  28 #include <luabind/detail/implicit_cast.hpp>
  29
  30 namespace luabind { namespace detail
  31 {
  32         template<class Direction = lua_to_cpp>
  33         struct COM_ptr_converter;
  34
  35         template<class T>
  36         struct COM_release
  37         {
  38                 static void release(void* ptr)
  39                 {
  40                         T* obj = static_cast<T*>(ptr);
  41                         obj->Release();
  42                 }
  43         };
  44
  45         template<>
  46         struct COM_ptr_converter<cpp_to_lua>
  47         {
  48                 template<class T>
  49                 void apply(lua_State* L, T* ptr)
  50                 {
  51                         if (ptr == 0)
  52                         {
  53                                 lua_pushnil(L);
  54                                 return;
  55                         }
  56
  57                         class_registry* registry = class_registry::get_registry(L);
  58                         class_rep* crep = registry->find_class(LUABIND_TYPEID(T));
  59
  60                         // if you get caught in this assert you are trying
  61                         // to use an unregistered type
  62                         assert(crep && "you are trying to use an unregistered type");
  63
  64                         // create the struct to hold the object
  65                         void* obj = lua_newuserdata(L, sizeof(object_rep));
  66                         new(obj) object_rep(ptr, crep, object_rep::owner, COM_release<T>::release);
  67
  68                         ptr->AddRef();
  69
  70                         // set the meta table
  71                         detail::getref(L, crep->metatable_ref());
  72                         lua_setmetatable(L, -2);
  73                 }
  74         };
  75
  76         template<int N>
  77         struct COM_policy : conversion_policy<N>
  78         {
  79                 static void precall(lua_State*, const index_map&) {}
  80                 static void postcall(lua_State*, const index_map&) {}
  81
  82                 template<class T, class Direction>
  83                 struct generate_converter
  84                 {
  85                         typedef COM_ptr_converter<cpp_to_lua> type;
  86                 };
  87         };
  88
  89 }}
  90
  91 namespace luabind
  92 {
  93         template<int N>
  94         detail::policy_cons<detail::COM_policy<N>, detail::null_type>
  95         COM_managed(boost::arg<N>) { return detail::policy_cons<detail::COM_policy<N>, detail::null_type>(); }
  96 }
  97
  98 #endif // LUABIND_COM_POLICY_HPP_INCLUDED
  99
 100
 101 function(L, "createCar", &createCar, COM_managed(result));
 102