// 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 |