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 #include <boost/mpl/apply_wrap.hpp>
  32
  33 namespace luabind { namespace detail
  34 {
  35         template<bool IsReferenceWrapper = false>
  36         struct unwrap_ref
  37         {
  38                 template<class T>
  39                 static const T& get(const T& r) { return r; }
  40
  41                 template<class T>
  42                 struct apply
  43                 {
  44                         typedef T type;
  45                 };
  46         };
  47
  48         template<>
  49         struct unwrap_ref<true>
  50         {
  51                 template<class T>
  52                 static T& get(const boost::reference_wrapper<T>& r) { return r.get(); }
  53
  54                 template<class T>
  55                 struct apply
  56                 {
  57                         typedef typename T::type& type;
  58                 };
  59         };
  60
  61         namespace mpl = boost::mpl;
  62
  63         template<class T>
  64         void convert_to_lua(lua_State* L, const T& v)
  65         {
  66                 typedef typename mpl::apply_wrap1<
  67                         unwrap_ref<boost::is_reference_wrapper<T>::value>
  68                   , T
  69                 >::type value_type;
  70
  71                 typename mpl::apply_wrap2<default_policy,value_type,cpp_to_lua>::type converter;
  72
  73                 converter.apply(L, unwrap_ref<boost::is_reference_wrapper<T>::value>::get(v));
  74         }
  75
  76         template<int Index, class T, class Policies>
  77         void convert_to_lua_p(lua_State* L, const T& v, const Policies&)
  78         {
  79                 typedef typename mpl::apply_wrap1<
  80                         unwrap_ref<boost::is_reference_wrapper<T>::value>
  81                   , T
  82                 >::type value_type;
  83
  84                 typedef typename find_conversion_policy<Index, Policies>::type converter_policy;
  85                 typename mpl::apply_wrap2<converter_policy,value_type,cpp_to_lua>::type converter;
  86
  87                 converter.apply(L, unwrap_ref<boost::is_reference_wrapper<T>::value>::get(v));
  88         }
  89 }}
  90
  91 #endif
  92