include/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 #include <luabind/detail/debug.hpp>
  33 #include <luabind/detail/stack_utils.hpp>
  34
  35 #include <boost/mpl/apply_wrap.hpp>
  36
  37 namespace luabind
  38 {
  39
  40         namespace detail
  41         {
  42
  43                 namespace mpl = boost::mpl;
  44
  45                 template<class T, class Obj, class Policies>
  46                 inline T object_cast_impl(const Obj& obj, const Policies&)
  47                 {
  48                         if (obj.lua_state() == 0)
  49                         {
  50 #ifndef LUABIND_NO_EXCEPTIONS
  51                                 throw cast_failed(0, LUABIND_TYPEID(T));
  52 #else
  53                                 lua_State* L = obj.lua_state();
  54                                 cast_failed_callback_fun e = get_cast_failed_callback();
  55                                 if (e) e(L, LUABIND_TYPEID(T));
  56
  57                                 assert(0 && "object_cast failed. If you want to handle this error use luabind::set_error_callback()");
  58                                 std::terminate();
  59 #endif
  60                         }
  61
  62                         LUABIND_CHECK_STACK(obj.lua_state());
  63
  64                         typedef typename detail::find_conversion_policy<0, Policies>::type converter_policy;
  65                         typename mpl::apply_wrap2<converter_policy,T,lua_to_cpp>::type converter;
  66
  67                         obj.pushvalue();
  68
  69                         lua_State* L = obj.lua_state();
  70                         detail::stack_pop p(L, 1);
  71
  72 #ifndef LUABIND_NO_ERROR_CHECKING
  73
  74                         if (converter.match(L, LUABIND_DECORATE_TYPE(T), -1) < 0)
  75                         {
  76 #ifndef LUABIND_NO_EXCEPTIONS
  77                                 throw cast_failed(L, LUABIND_TYPEID(T));
  78 #else
  79                                 cast_failed_callback_fun e = get_cast_failed_callback();
  80                                 if (e) e(L, LUABIND_TYPEID(T));
  81
  82                                 assert(0 && "object_cast failed. If you want to handle this error use luabind::set_error_callback()");
  83                                 std::terminate();
  84 #endif
  85                         }
  86 #endif
  87
  88                         return converter.apply(L, LUABIND_DECORATE_TYPE(T), -1);
  89                 }
  90
  91                 template<class T, class Obj, class Policies>
  92                 boost::optional<T> object_cast_nothrow_impl(const Obj& obj, const Policies&)
  93                 {
  94                         typedef typename detail::find_conversion_policy<0, Policies>::type converter_policy;
  95                         typename mpl::apply_wrap2<converter_policy,T,lua_to_cpp>::type converter;
  96
  97                         if (obj.lua_state() == 0) return boost::optional<T>();
  98                         LUABIND_CHECK_STACK(obj.lua_state());
  99
 100                         obj.pushvalue();
 101
 102                         lua_State* L = obj.lua_state();
 103                         detail::stack_pop p(L, 1);
 104
 105 #ifndef LUABIND_NO_ERROR_CHECKING
 106
 107                         if (converter.match(L, LUABIND_DECORATE_TYPE(T), -1) < 0)
 108                                 return boost::optional<T>();
 109 #endif
 110
 111                         return boost::optional<T>(converter.apply(L, LUABIND_DECORATE_TYPE(T), -1));
 112                 }
 113         }
 114
 115         template<class T>
 116         T object_cast(const object& obj)
 117         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
 118
 119         template<class T, class Policies>
 120         T object_cast(const object& obj, const Policies& p)
 121         { return detail::object_cast_impl<T>(obj, p); }
 122
 123         template<class T>
 124         boost::optional<T> object_cast_nothrow(const object& obj)
 125         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 126
 127         template<class T, class Policies>
 128         boost::optional<T> object_cast_nothrow(const object& obj, const Policies& p)
 129         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 130
 131
 132         template<class T>
 133         T object_cast(const detail::proxy_object& obj)
 134         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
 135
 136         template<class T, class Policies>
 137         T object_cast(const detail::proxy_object& obj, const Policies& p)
 138         { return detail::object_cast_impl<T>(obj, p); }
 139
 140         template<class T>
 141         boost::optional<T> object_cast_nothrow(const detail::proxy_object& obj)
 142         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 143
 144         template<class T, class Policies>
 145         boost::optional<T> object_cast_nothrow(const detail::proxy_object& obj, const Policies& p)
 146         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 147
 148
 149         template<class T>
 150         T object_cast(const detail::proxy_raw_object& obj)
 151         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
 152
 153         template<class T, class Policies>
 154         T object_cast(const detail::proxy_raw_object& obj, const Policies& p)
 155         { return detail::object_cast_impl<T>(obj, p); }
 156
 157         template<class T>
 158         boost::optional<T> object_cast_nothrow(const detail::proxy_raw_object& obj)
 159         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 160
 161         template<class T, class Policies>
 162         boost::optional<T> object_cast_nothrow(const detail::proxy_raw_object& obj, const Policies& p)
 163         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 164
 165
 166         template<class T>
 167         T object_cast(const detail::proxy_array_object& obj)
 168         { return detail::object_cast_impl<T>(obj, detail::null_type()); }
 169
 170         template<class T, class Policies>
 171         T object_cast(const detail::proxy_array_object& obj, const Policies& p)
 172         { return detail::object_cast_impl<T>(obj, p); }
 173
 174         template<class T>
 175         boost::optional<T> object_cast_nothrow(const detail::proxy_array_object& obj)
 176         { return detail::object_cast_nothrow_impl<T>(obj, detail::null_type()); }
 177
 178         template<class T, class Policies>
 179         boost::optional<T> object_cast_nothrow(const detail::proxy_array_object& obj, const Policies& p)
 180         { return detail::object_cast_nothrow_impl<T>(obj, p); }
 181
 182
 183
 184
 185         inline object get_globals(lua_State* L)
 186         {
 187                 lua_pushvalue(L, LUA_GLOBALSINDEX);
 188                 detail::lua_reference ref;
 189                 ref.set(L);
 190                 return object(L, ref, true/*object::reference()*/);
 191         }
 192
 193         inline object get_registry(lua_State* L)
 194         {
 195                 lua_pushvalue(L, LUA_REGISTRYINDEX);
 196                 detail::lua_reference ref;
 197                 ref.set(L);
 198                 return object(L, ref, true/*object::reference()*/);
 199         }
 200
 201         inline object newtable(lua_State* L)
 202         {
 203                 lua_newtable(L);
 204                 detail::lua_reference ref;
 205                 ref.set(L);
 206                 return object(L, ref, true/*object::reference()*/);
 207         }
 208 }
 209
 210 /*
 211
 212 struct A
 213 {
 214 };
 215
 216 object f = class_<A>();
 217
 218 A* ptr = object_cast<A*>(f(), adopt(_1));
 219
 220 delete ptr;
 221
 222 */
 223
 224 #endif // LUABIND_OBJECT_PROXY_HPP_INCLUDED