ceph/src/boost/libs/python/include/boost/python/detail/unwrap_wrapper.hpp

   1 // Copyright David Abrahams 2004. Distributed under the Boost
   2 // Software License, Version 1.0. (See accompanying
   3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4 #ifndef UNWRAP_WRAPPER_DWA2004723_HPP
   5 # define UNWRAP_WRAPPER_DWA2004723_HPP
   6
   7 # include <boost/python/detail/prefix.hpp>
   8 # include <boost/python/detail/is_wrapper.hpp>
   9 # include <boost/mpl/eval_if.hpp>
  10 # include <boost/mpl/identity.hpp>
  11
  12 namespace boost { namespace python { namespace detail {
  13
  14 template <class T>
  15 struct unwrap_wrapper_helper
  16 {
  17     typedef typename T::_wrapper_wrapped_type_ type;
  18 };
  19
  20 template <class T>
  21 struct unwrap_wrapper_
  22   : mpl::eval_if<is_wrapper<T>,unwrap_wrapper_helper<T>,mpl::identity<T> >
  23 {};
  24
  25 template <class T>
  26 typename unwrap_wrapper_<T>::type*
  27 unwrap_wrapper(T*)
  28 {
  29     return 0;
  30 }
  31
  32 }}} // namespace boost::python::detail
  33
  34 #endif // UNWRAP_WRAPPER_DWA2004723_HPP