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diff --git a/gnuradio-runtime/include/gnuradio/feval.h b/gnuradio-runtime/include/gnuradio/feval.h
new file mode 100644
index 0000000000..40e3ad9a55
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+++ b/gnuradio-runtime/include/gnuradio/feval.h
@@ -0,0 +1,187 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2013 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 3, 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., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_FEVAL_H
+#define INCLUDED_GR_FEVAL_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/gr_complex.h>
+#include <pmt/pmt.h>
+
+namespace gr {
+
+  /*!
+   * \brief base class for evaluating a function: double -> double
+   * \ingroup misc
+   *
+   * 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.
+   *
+   * Override eval to define the behavior.
+   * Use calleval to invoke eval (this kludge is required to allow a
+   * python specific "shim" to be inserted.
+   */
+  class GR_RUNTIME_API feval_dd
+  {
+  protected:
+    /*!
+     * \brief override this to define the function
+     */
+    virtual double eval(double x);
+
+  public:
+    feval_dd() {}
+    virtual ~feval_dd();
+
+    virtual double calleval(double x);	// invoke "eval"
+  };
+
+  /*!
+   * \brief base class for evaluating a function: complex -> complex
+   * \ingroup misc
+   *
+   * 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.
+   *
+   * Override eval to define the behavior.
+   * Use calleval to invoke eval (this kludge is required to allow a
+   * python specific "shim" to be inserted.
+   */
+  class GR_RUNTIME_API feval_cc
+  {
+  protected:
+    /*!
+     * \brief override this to define the function
+     */
+    virtual gr_complex eval(gr_complex x);
+
+  public:
+    feval_cc() {}
+    virtual ~feval_cc();
+
+    virtual gr_complex calleval(gr_complex x);	// invoke "eval"
+  };
+
+  /*!
+   * \brief base class for evaluating a function: long -> long
+   * \ingroup misc
+   *
+   * 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.
+   *
+   * Override eval to define the behavior.
+   * Use calleval to invoke eval (this kludge is required to allow a
+   * python specific "shim" to be inserted.
+   */
+  class GR_RUNTIME_API feval_ll
+  {
+  protected:
+    /*!
+     * \brief override this to define the function
+     */
+    virtual long eval(long x);
+
+  public:
+    feval_ll() {}
+    virtual ~feval_ll();
+
+    virtual long calleval(long x);	// invoke "eval"
+  };
+
+  /*!
+   * \brief base class for evaluating a function: void -> void
+   * \ingroup misc
+   *
+   * 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.
+   *
+   * Override eval to define the behavior.
+   * Use calleval to invoke eval (this kludge is required to allow a
+   * python specific "shim" to be inserted.
+   */
+  class GR_RUNTIME_API feval
+  {
+  protected:
+    /*!
+     * \brief override this to define the function
+     */
+    virtual void eval();
+
+  public:
+    feval() {}
+    virtual ~feval();
+
+    virtual void calleval();	// invoke "eval"
+  };
+
+  /*!
+   * \brief base class for evaluating a function: pmt -> void
+   * \ingroup misc
+   *
+   * 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.
+   *
+   * Override eval to define the behavior.
+   * Use calleval to invoke eval (this kludge is required to allow a
+   * python specific "shim" to be inserted.
+   */
+  class GR_RUNTIME_API feval_p
+  {
+  protected:
+    /*!
+     * \brief override this to define the function
+     */
+    virtual void eval(pmt::pmt_t x);
+
+  public:
+    feval_p() {}
+    virtual ~feval_p();
+
+    virtual void calleval(pmt::pmt_t x);	// invoke "eval"
+  };
+
+  /*!
+   * \brief trivial examples / test cases showing C++ calling Python code
+   */
+  GR_RUNTIME_API double     feval_dd_example(feval_dd *f, double x);
+  GR_RUNTIME_API gr_complex feval_cc_example(feval_cc *f, gr_complex x);
+  GR_RUNTIME_API long       feval_ll_example(feval_ll *f, long x);
+  GR_RUNTIME_API void       feval_example(feval *f);
+
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_FEVAL_H */