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diff --git a/gnuradio-core/src/lib/general/gr_feval.h b/gnuradio-core/src/lib/general/gr_feval.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#ifndef INCLUDED_GR_FEVAL_H
+#define INCLUDED_GR_FEVAL_H
+
+#include <gr_complex.h>
+
+/*!
+ * \brief base class for evaluating a function: double -> double
+ *
+ * This class is designed to be subclassed in Python or C++
+ * and is callable from both places.  It uses SWIG's
+ * "director" feature to implement the magic.
+ * It's slow. Don't use it in a performance critical path.
+ */
+class gr_feval_dd
+{
+public:
+  gr_feval_dd() {}
+  virtual ~gr_feval_dd();
+
+  /*!
+   * \brief override this to define the function
+   */
+  virtual double eval(double x);
+};
+
+/*!
+ * \brief base class for evaluating a function: float -> float
+ *
+ * This class is designed to be subclassed in Python or C++
+ * and is callable from both places.  It uses SWIG's
+ * "director" feature to implement the magic.
+ * It's slow. Don't use it in a performance critical path.
+ */
+class gr_feval_ff
+{
+public:
+  gr_feval_ff() {}
+  virtual ~gr_feval_ff();
+
+  /*!
+   * \brief override this to define the function
+   */
+  virtual float eval(float x);
+};
+
+/*!
+ * \brief base class for evaluating a function: complex -> complex
+ *
+ * This class is designed to be subclassed in Python or C++
+ * and is callable from both places.  It uses SWIG's
+ * "director" feature to implement the magic.
+ * It's slow. Don't use it in a performance critical path.
+ */
+class gr_feval_cc
+{
+public:
+  gr_feval_cc() {}
+  virtual ~gr_feval_cc();
+
+  /*!
+   * \brief override this to define the function
+   */
+  virtual gr_complex eval(gr_complex x);
+};
+
+/*!
+ * \brief base class for evaluating a function: long -> long
+ *
+ * This class is designed to be subclassed in Python or C++
+ * and is callable from both places.  It uses SWIG's
+ * "director" feature to implement the magic.
+ * It's slow. Don't use it in a performance critical path.
+ */
+class gr_feval_ll
+{
+public:
+  gr_feval_ll() {}
+  virtual ~gr_feval_ll();
+
+  /*!
+   * \brief override this to define the function
+   */
+  virtual long eval(long x);
+};
+
+/*!
+ * \brief trivial examples / test cases showing C++ calling Python code
+ */
+double     gr_feval_dd_example(gr_feval_dd *f, double x);
+float      gr_feval_ff_example(gr_feval_ff *f, float x);
+gr_complex gr_feval_cc_example(gr_feval_cc *f, gr_complex x);
+long       gr_feval_ll_example(gr_feval_ll *f, long x);
+
+
+#endif /* INCLUDED_GR_FEVAL_H */