python/include/boost/python/detail/is_wrapper.hpp at develop · orivej/python · GitHub

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// 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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