// Copyright David Abrahams 2004. Distributed under the Boost

// Software License, Version 1.0. (See accompanying

// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#ifndef IS_WRAPPER_DWA2004723_HPP

# define IS_WRAPPER_DWA2004723_HPP



# include <boost/python/detail/prefix.hpp>

# include <boost/mpl/bool.hpp>



namespace boost { namespace python {



template <class T> class wrapper;



namespace detail

{

  typedef char (&is_not_wrapper)[2];

  is_not_wrapper is_wrapper_helper(...);

  template <class T>

  char is_wrapper_helper(wrapper<T> const volatile*);



  // A metafunction returning true iff T is [derived from] wrapper<U> 

  template <class T>

  struct is_wrapper

    : mpl::bool_<(sizeof(detail::is_wrapper_helper((T*)0)) == 1)>

  {};



}}} // namespace boost::python::detail



#endif // IS_WRAPPER_DWA2004723_HPP

