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