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diff --git a/boost/python/object.hpp b/boost/python/object.hpp
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+++ b/boost/python/object.hpp
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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 OBJECT_DWA2002612_HPP
+# define OBJECT_DWA2002612_HPP
+
+# include <boost/python/ssize_t.hpp>
+# include <boost/python/object_core.hpp>
+# include <boost/python/object_attributes.hpp>
+# include <boost/python/object_items.hpp>
+# include <boost/python/object_slices.hpp>
+# include <boost/python/object_operators.hpp>
+# include <boost/python/converter/arg_to_python.hpp>
+
+namespace boost { namespace python {
+
+    inline ssize_t len(object const& obj)
+    {
+        ssize_t result = PyObject_Length(obj.ptr());
+        if (PyErr_Occurred()) throw_error_already_set();
+        return result;
+    }
+
+}} // namespace boost::python
+
+#endif // OBJECT_DWA2002612_HPP