luabind/detail/object_funs.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_OBJECT_PROXY_HPP_INCLUDED
  24 #define LUABIND_OBJECT_PROXY_HPP_INCLUDED
  25
  26 #include <boost/optional.hpp>
  27
  28 #include <luabind/config.hpp>
  29 #include <luabind/detail/policy.hpp>
  30 #include <luabind/error.hpp>
  31 #include <luabind/detail/convert_to_lua.hpp>
  32
  33 namespace luabind
  34 {
  35
  36         namespace detail
  37         {
  38
  39                 template<class T, class Obj, class Policies>
  40                 inline T object_cast_impl(const Obj& obj, const Policies&)
  41                 {
  42                         typedef typename detail::find_conversion_policy<0, Policies>::type converter_policy;
  43                         typename converter_policy::template generate_converter<T, lua_to_cpp>::type converter;
  44
  45                         obj.pushvalue();
  46
  47                         lua_State* L = obj.lua_state();
  48                         detail::stack_pop p(L, 1);
  49
  50 #ifndef LUABIND_NO_ERROR_CHECKING
  51
  52                         if (converter.match(L, LUABIND_DECORATE_TYPE(T), -1) < 0)
  53                         {
  54 #ifndef LUABIND_NO_EXCEPTIONS
  55                                 throw cast_failed(L, LUABIND_TYPEID(T));
  56 #else
  57                                 cast_failed_callback_fun e = get_cast_failed_callback();
  58                                 if (e) e(L, LUABIND_TYPEID(T));
  59
  60                                 assert(0 && "object_cast failed. If you want to handle this error use luabind::set_error_callback()");
  61                                 std::terminate();
  62 #endif
  63                         }
  64 #endif
  65
  66                         return converter.apply(L, LUABIND_DECORATE_TYPE(T), -1);
  67                 }
  68
  69                 template<class T, class Obj, class Policies>
  70                 boost::optional<T> object_cast_nothrow_impl(const Obj& obj, const Policies&)
  71                 {
  72                         typedef typename detail::find_conversion_policy<0, Policies>::type converter_policy;
  73                         typename converter_policy::template generate_converter<T, lua_to_cpp>::type converter;
  74
  75                         obj.pushvalue();
  76
  77                         lua_State* L = obj.lua_state();
  78                         detail::stack_pop p(L, 1);
  79
  80 #ifndef LUABIND_NO_ERROR_CHECKING
  81
  82                         if (converter.match(L, LUABIND_DECORATE_TYPE(T), -1) < 0)
  83                                 return boost::optional<T>();
  84 #endif
  85
  86                         return boost::optional<T>(converter.apply(L, LUABIND_DECORATE_TYPE(T), -1));
  87                 }
  88         }
  89
  90         template<class T>
  91         T object_cast(const object& obj)
  92         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
  93
  94         template<class T, class Policies>
  95         T object_cast(const object& obj, const Policies& p)
  96         { return detail::object_cast_impl<T>(obj, p); }
  97
  98         template<class T>
  99         boost::optional<T> object_cast_nothrow(const object& obj)
 100         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 101
 102         template<class T, class Policies>
 103         boost::optional<T> object_cast_nothrow(const object& obj, const Policies& p)
 104         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 105
 106
 107         template<class T>
 108         T object_cast(const detail::proxy_object& obj)
 109         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
 110
 111         template<class T, class Policies>
 112         T object_cast(const detail::proxy_object& obj, const Policies& p)
 113         { return detail::object_cast_impl<T>(obj, p); }
 114
 115         template<class T>
 116         boost::optional<T> object_cast_nothrow(const detail::proxy_object& obj)
 117         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 118
 119         template<class T, class Policies>
 120         boost::optional<T> object_cast_nothrow(const detail::proxy_object& obj, const Policies& p)
 121         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 122
 123
 124         template<class T>
 125         T object_cast(const detail::proxy_raw_object& obj)
 126         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
 127
 128         template<class T, class Policies>
 129         T object_cast(const detail::proxy_raw_object& obj, const Policies& p)
 130         { return detail::object_cast_impl<T>(obj, p); }
 131
 132         template<class T>
 133         boost::optional<T> object_cast_nothrow(const detail::proxy_raw_object& obj)
 134         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 135
 136         template<class T, class Policies>
 137         boost::optional<T> object_cast_nothrow(const detail::proxy_raw_object& obj, const Policies& p)
 138         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 139
 140
 141         template<class T>
 142         T object_cast(const detail::proxy_array_object& obj)
 143         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
 144
 145         template<class T, class Policies>
 146         T object_cast(const detail::proxy_array_object& obj, const Policies& p)
 147         { return detail::object_cast_impl<T>(obj, p); }
 148
 149         template<class T>
 150         boost::optional<T> object_cast_nothrow(const detail::proxy_array_object& obj)
 151         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 152
 153         template<class T, class Policies>
 154         boost::optional<T> object_cast_nothrow(const detail::proxy_array_object& obj, const Policies& p)
 155         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 156
 157
 158
 159
 160         inline object get_globals(lua_State* L)
 161         {
 162                 lua_pushvalue(L, LUA_GLOBALSINDEX);
 163                 detail::lua_reference ref;
 164                 ref.set(L);
 165                 return object(L, ref, true/*object::reference()*/);
 166         }
 167
 168         inline object get_registry(lua_State* L)
 169         {
 170                 lua_pushvalue(L, LUA_REGISTRYINDEX);
 171                 detail::lua_reference ref;
 172                 ref.set(L);
 173                 return object(L, ref, true/*object::reference()*/);
 174         }
 175
 176         inline object newtable(lua_State* L)
 177         {
 178                 lua_newtable(L);
 179                 detail::lua_reference ref;
 180                 ref.set(L);
 181                 return object(L, ref, true/*object::reference()*/);
 182         }
 183 }
 184
 185 /*
 186
 187 struct A
 188 {
 189 };
 190
 191 object f = class_<A>();
 192
 193 A* ptr = object_cast<A*>(f(), adopt(_1));
 194
 195 delete ptr;
 196
 197 */
 198
 199 #endif // LUABIND_OBJECT_PROXY_HPP_INCLUDED