luabind/detail/convert_to_lua.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_CONVERT_TO_LUA_HPP_INCLUDED
  25 #define LUABIND_CONVERT_TO_LUA_HPP_INCLUDED
  26
  27 #include <luabind/config.hpp>
  28 #include <luabind/detail/policy.hpp>
  29 #include <boost/ref.hpp>
  30
  31 namespace luabind { namespace detail
  32 {
  33         template<bool IsReferenceWrapper = false>
  34         struct unwrap_ref
  35         {
  36                 template<class T>
  37                 static const T& get(const T& r) { return r; }
  38
  39                 template<class T>
  40                 struct apply
  41                 {
  42                         typedef T type;
  43                 };
  44         };
  45
  46         template<>
  47         struct unwrap_ref<true>
  48         {
  49                 template<class T>
  50                 static T& get(const boost::reference_wrapper<T>& r) { return r.get(); }
  51
  52                 template<class T>
  53                 struct apply
  54                 {
  55                         typedef typename T::type& type;
  56                 };
  57         };
  58
  59         template<class T>
  60         void convert_to_lua(lua_State* L, const T& v)
  61         {
  62                 typedef typename unwrap_ref<boost::is_reference_wrapper<T>::value>::template apply<T>::type value_type;
  63                 typename default_policy::template generate_converter<value_type, cpp_to_lua>::type converter;
  64
  65                 converter.apply(L, unwrap_ref<boost::is_reference_wrapper<T>::value>::get(v));
  66         }
  67
  68         template<int Index, class T, class Policies>
  69         void convert_to_lua_p(lua_State* L, const T& v, const Policies&)
  70         {
  71                 typedef typename unwrap_ref<boost::is_reference_wrapper<T>::value>::template apply<T>::type value_type;
  72                 typedef typename find_conversion_policy<Index, Policies>::type converter_policy;
  73                 typename converter_policy::template generate_converter<value_type, cpp_to_lua>::type converter;
  74
  75                 converter.apply(L, unwrap_ref<boost::is_reference_wrapper<T>::value>::get(v));
  76         }
  77 }}
  78
  79 #endif
  80