boost/python/copy_const_reference.hpp

   1 // Copyright David Abrahams 2002.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5 #ifndef COPY_CONST_REFERENCE_DWA2002131_HPP
   6 # define COPY_CONST_REFERENCE_DWA2002131_HPP
   7
   8 # include <boost/python/detail/prefix.hpp>
   9 # include <boost/python/detail/indirect_traits.hpp>
  10 # include <boost/mpl/if.hpp>
  11 # include <boost/python/to_python_value.hpp>
  12
  13 namespace boost { namespace python {
  14
  15 namespace detail
  16 {
  17   template <class R>
  18   struct copy_const_reference_expects_a_const_reference_return_type
  19 # if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__)
  20   {}
  21 # endif
  22   ;
  23 }
  24
  25 template <class T> struct to_python_value;
  26
  27 struct copy_const_reference
  28 {
  29     template <class T>
  30     struct apply
  31     {
  32         typedef typename mpl::if_c<
  33             indirect_traits::is_reference_to_const<T>::value
  34           , to_python_value<T>
  35           , detail::copy_const_reference_expects_a_const_reference_return_type<T>
  36         >::type type;
  37     };
  38 };
  39
  40
  41 }} // namespace boost::python
  42
  43 #endif // COPY_CONST_REFERENCE_DWA2002131_HPP