luabind/detail/property.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_PROPERTY_HPP_INCLUDED
  25 #define LUABIND_PROPERTY_HPP_INCLUDED
  26
  27 #include <luabind/config.hpp>
  28
  29 namespace luabind { namespace detail
  30 {
  31         class object_rep;
  32 /*
  33         template<class R, class T, class Policies>
  34         int get(R(T::*f)() const, T* obj, lua_State* L, Policies* policies)  { return returns<R>::call(f, obj, L, policies); }
  35
  36         template<class R, class T, class Policies>
  37         int get(R(*f)(const T*), T* obj, lua_State* L, Policies* policies) { return returns<R>::call(f, obj, L, policies); }
  38
  39         template<class R, class T, class Policies>
  40         int get(R(*f)(const T&), T* obj, lua_State* L, Policies* policies) { return returns<R>::call(f, obj, L, policies); }
  41 */
  42
  43         template<class R, class T, class Policies>
  44         int get(R(T::*f)() const, T* obj, lua_State* L, Policies* policies)  { return returns<R>::call(f, obj, L, policies); }
  45
  46         template<class R, class T, class U, class Policies>
  47         int get(R(*f)(T), U* obj, lua_State* L, Policies* policies) { return returns<R>::call(f, obj, L, policies); }
  48
  49         template<class T, class F, class Policies>
  50         struct get_caller : Policies
  51         {
  52                 get_caller() {}
  53                 get_caller(const Policies& p): Policies(p) {}
  54
  55                 int operator()(lua_State* L, int pointer_offset, F f)
  56                 {
  57                         // parameters on the lua stack:
  58                         // 1. object_rep
  59                         // 2. key (property name)
  60
  61                         object_rep* obj = static_cast<object_rep*>(lua_touserdata(L, 1));
  62                         class_rep* crep = obj->crep();
  63
  64                         void* ptr;
  65
  66                         if (crep->has_holder())
  67                                 ptr = crep->extractor()(obj->ptr());
  68                         else
  69                                 ptr = obj->ptr();
  70
  71                         return get(f, reinterpret_cast<T*>(static_cast<char*>(ptr) + pointer_offset), L, static_cast<Policies*>(this));
  72                 }
  73         };
  74
  75         template<class T, class A1, class Policies>
  76         int set(void(T::*f)(A1), T* obj, lua_State* L, Policies* policies)  { return returns<void>::call(f, obj, L, policies); }
  77 /*
  78         template<class R, class T, class A1, class Policies>
  79         int set(void(*f)(T*, A1), T* obj, lua_State* L, Policies* policies) { return returns<void>::call(f, obj, L, policies); }
  80
  81         template<class T, class A1, class Policies>
  82         int set(void(*f)(T&, A1), T* obj, lua_State* L, Policies* policies) { return returns<void>::call(f, obj, L, policies); }
  83 */
  84
  85         template<class T, class U, class A1, class Policies>
  86         int set(void(*f)(T, A1), U* obj, lua_State* L, Policies* policies) { return returns<void>::call(f, obj, L, policies); }
  87
  88         template<class T, class F, class Policies>
  89         struct set_caller : Policies
  90         {
  91                 int operator()(lua_State* L, int pointer_offset, F f)
  92                 {
  93                         // parameters on the lua stack:
  94                         // 1. object_rep
  95                         // 2. key (property name)
  96                         // 3. value
  97
  98                         // and since call() expects it's first
  99                         // parameter on index 2 we need to
 100                         // remove the key-parameter (parameter 2).
 101                         object_rep* obj = reinterpret_cast<object_rep*>(lua_touserdata(L, 1));
 102                         class_rep* crep = obj->crep();
 103
 104                         void* ptr;
 105
 106                         if (crep->has_holder())
 107                                 ptr = crep->extractor()(obj->ptr());
 108                         else
 109                                 ptr = obj->ptr();
 110
 111                         lua_remove(L, 2);
 112                         return set(f, reinterpret_cast<T*>(static_cast<char*>(ptr) + pointer_offset), L, static_cast<Policies*>(this));
 113                 }
 114         };
 115
 116         // TODO: add support for policies
 117         template<class T, class D, class Policies>
 118         struct auto_set : Policies
 119         {
 120                 auto_set() {}
 121                 auto_set(const Policies& p): Policies(p) {}
 122
 123                 int operator()(lua_State* L, int pointer_offset, D T::*member)
 124                 {
 125                         int nargs = lua_gettop(L);
 126
 127                         // parameters on the lua stack:
 128                         // 1. object_rep
 129                         // 2. key (property name)
 130                         // 3. value
 131                         object_rep* obj = static_cast<object_rep*>(lua_touserdata(L, 1));
 132                         T* ptr =  reinterpret_cast<T*>(static_cast<char*>(obj->ptr()) + pointer_offset);
 133
 134                         typedef typename find_conversion_policy<1,Policies>::type converter_policy;
 135                         typename converter_policy::template generate_converter<D,lua_to_cpp>::type converter;
 136                         ptr->*member = converter.apply(L, LUABIND_DECORATE_TYPE(D), 3);
 137
 138                         int nret = lua_gettop(L) - nargs;
 139
 140                         const int indices[] = { 1, nargs + nret, 3 };
 141
 142                         policy_list_postcall<Policies>::apply(L, indices);
 143
 144                         return nret;
 145                 }
 146         };
 147
 148         // TODO: add support for policies
 149         template<class T, class D, class Policies>
 150         struct auto_get : Policies
 151         {
 152                 auto_get() {}
 153                 auto_get(const Policies& p): Policies(p) {}
 154
 155                 int operator()(lua_State* L, int pointer_offset, D T::*member)
 156                 {
 157                         int nargs = lua_gettop(L);
 158
 159                         // parameters on the lua stack:
 160                         // 1. object_rep
 161                         // 2. key (property name)
 162                         object_rep* obj = static_cast<object_rep*>(lua_touserdata(L, 1));
 163                         T* ptr =  reinterpret_cast<T*>(static_cast<char*>(obj->ptr()) + pointer_offset);
 164
 165                         typedef typename find_conversion_policy<0,Policies>::type converter_policy;
 166                         typename converter_policy::template generate_converter<D,cpp_to_lua>::type converter;
 167                         converter.apply(L, ptr->*member);
 168
 169                         int nret = lua_gettop(L) - nargs;
 170
 171                         const int indices[] = { 1, nargs + nret };
 172
 173                         policy_list_postcall<Policies>::apply(L, indices);
 174
 175                         return nret;
 176                 }
 177         };
 178
 179 }}
 180
 181 #endif // LUABIND_PROPERTY_HPP_INCLUDED
 182