| // 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 |