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