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+// Copyright David Abrahams 2002.
+// 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 CV_CATEGORY_DWA200222_HPP
+# define CV_CATEGORY_DWA200222_HPP
+# include <boost/type_traits/cv_traits.hpp>
+
+namespace boost { namespace python { namespace detail {
+
+template <bool is_const_, bool is_volatile_>
+struct cv_tag
+{
+ BOOST_STATIC_CONSTANT(bool, is_const = is_const_);
+ BOOST_STATIC_CONSTANT(bool, is_volatile = is_const_);
+};
+
+typedef cv_tag<false,false> cv_unqualified;
+typedef cv_tag<true,false> const_;
+typedef cv_tag<false,true> volatile_;
+typedef cv_tag<true,true> const_volatile_;
+
+template <class T>
+struct cv_category
+{
+// BOOST_STATIC_CONSTANT(bool, c = is_const<T>::value);
+// BOOST_STATIC_CONSTANT(bool, v = is_volatile<T>::value);
+ typedef cv_tag<
+ ::boost::is_const<T>::value
+ , ::boost::is_volatile<T>::value
+ > type;
+};
+
+}}} // namespace boost::python::detail
+
+#endif // CV_CATEGORY_DWA200222_HPP