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Editing: is_wrapper.hpp
// 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
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