luabind/detail/other.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_OTHER_HPP_INCLUDED
  25 #define LUABIND_OTHER_HPP_INCLUDED
  26
  27 // header derived from source code found in Boost.Python
  28
  29 // Copyright David Abrahams 2002. Permission to copy, use,
  30 // modify, sell and distribute this software is granted provided this
  31 // copyright notice appears in all copies. This software is provided
  32 // "as is" without express or implied warranty, and with no claim as
  33 // to its suitability for any purpose.
  34
  35 #include <luabind/config.hpp>
  36 #include <boost/config.hpp>
  37
  38 namespace luabind
  39 {
  40         template<class T>
  41         struct other
  42         {
  43                 typedef T type;
  44         };
  45 }
  46
  47 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  48 namespace luabind { namespace detail
  49 {
  50         template<typename T>
  51         class unwrap_other
  52         {
  53         public:
  54                         typedef T type;
  55         };
  56
  57         template<typename T>
  58         class unwrap_other<other<T> >
  59         {
  60         public:
  61                         typedef T type;
  62         };
  63 }} // namespace luabind::detail
  64
  65 # else // no partial specialization
  66
  67 #include <boost/type.hpp>
  68
  69 namespace luabind { namespace detail
  70 {
  71         typedef char (&yes_other_t)[1];
  72         typedef char (&no_other_t)[2];
  73
  74         no_other_t is_other_test(...);
  75
  76         template<typename T>
  77         yes_other_t is_other_test(type_< other<T> >);
  78
  79         template<bool wrapped>
  80         struct other_unwrapper
  81         {
  82                         template <class T>
  83                         struct apply
  84                         {
  85                                         typedef T type;
  86                         };
  87         };
  88
  89         template<>
  90         struct other_unwrapper<true>
  91         {
  92                         template <class T>
  93                         struct apply
  94                         {
  95                                         typedef typename T::type type;
  96                         };
  97         };
  98
  99         template<typename T>
 100         class is_other
 101         {
 102          public:
 103                         BOOST_STATIC_CONSTANT(
 104                                         bool, value = (
 105                                                         sizeof(detail::is_other_test(type_<T>()))
 106                                                         == sizeof(detail::yes_other_t)));
 107         };
 108
 109         template <typename T>
 110         class unwrap_other
 111                         : public detail::other_unwrapper<
 112                         is_other<T>::value
 113         >::template apply<T>
 114         {};
 115
 116 }} // namespace luabind::detail
 117 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
 118
 119 #endif // LUABIND_OTHER_HPP_INCLUDED