Chris@16: // Copyright David Abrahams 2004. Distributed under the Boost
Chris@16: // Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef IS_WRAPPER_DWA2004723_HPP
Chris@16: # define IS_WRAPPER_DWA2004723_HPP
Chris@16: 
Chris@16: # include <boost/python/detail/prefix.hpp>
Chris@16: # include <boost/mpl/bool.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python {
Chris@16: 
Chris@16: template <class T> class wrapper;
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   typedef char (&is_not_wrapper)[2];
Chris@16:   is_not_wrapper is_wrapper_helper(...);
Chris@16:   template <class T>
Chris@16:   char is_wrapper_helper(wrapper<T> const volatile*);
Chris@16: 
Chris@16:   // A metafunction returning true iff T is [derived from] wrapper<U> 
Chris@16:   template <class T>
Chris@16:   struct is_wrapper
Chris@16:     : mpl::bool_<(sizeof(detail::is_wrapper_helper((T*)0)) == 1)>
Chris@16:   {};
Chris@16: 
Chris@16: }}} // namespace boost::python::detail
Chris@16: 
Chris@16: #endif // IS_WRAPPER_DWA2004723_HPP