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diff --git a/python/pyutils.h b/python/pyutils.h
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+/*
+ * Copyright (c) 2003-2008, John Wiegley.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of New Artisans LLC nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _PY_UTILS_H
+#define _PY_UTILS_H
+
+#include "pyfstream.h"
+
+template <typename T, typename TfromPy>
+struct object_from_python
+{
+  object_from_python() {
+    boost::python::converter::registry::push_back
+      (&TfromPy::convertible, &TfromPy::construct,
+       boost::python::type_id<T>());
+  }
+};
+
+template <typename T, typename TtoPy, typename TfromPy>
+struct register_python_conversion
+{
+  register_python_conversion() {
+    boost::python::to_python_converter<T, TtoPy>();
+    object_from_python<T, TfromPy>();
+  }
+};
+
+template <typename T>
+struct register_optional_to_python : public boost::noncopyable
+{
+  struct optional_to_python
+  {
+    static PyObject * convert(const boost::optional<T>& value)
+    {
+      return boost::python::incref
+	(value ? boost::python::to_python_value<T>()(*value) :
+		 boost::python::detail::none());
+    }
+  };
+
+  struct optional_from_python
+  {
+    static void * convertible(PyObject * source)
+    {
+      using namespace boost::python::converter;
+
+      if (source == Py_None)
+	return source;
+
+      const registration& converters(registered<T>::converters);
+
+      if (implicit_rvalue_convertible_from_python(source, converters)) {
+	rvalue_from_python_stage1_data data =
+	  rvalue_from_python_stage1(source, converters);
+	return rvalue_from_python_stage2(source, data, converters);
+      }
+      return NULL;
+    }
+
+    static void construct(PyObject * source,
+			  boost::python::converter::rvalue_from_python_stage1_data * data)
+    {
+      using namespace boost::python::converter;
+
+      void * const storage = ((rvalue_from_python_storage<T> *) data)->storage.bytes;
+
+      if (data->convertible == source)	    // == None
+	new (storage) boost::optional<T>(); // A Boost uninitialized value
+      else
+	new (storage) boost::optional<T>(*static_cast<T *>(data->convertible));
+
+      data->convertible = storage;
+    }
+  };
+
+  explicit register_optional_to_python() {
+    register_python_conversion<boost::optional<T>,
+      optional_to_python, optional_from_python>();
+  }
+};
+
+//boost::python::register_ptr_to_python< boost::shared_ptr<Base> >();
+
+#endif // _PY_UTILS_H