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29 lines
839 B
29 lines
839 B
// 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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