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diff --git a/host/lib/rfnoc/nocscript/function_table.hpp b/host/lib/rfnoc/nocscript/function_table.hpp
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+++ b/host/lib/rfnoc/nocscript/function_table.hpp
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+//
+// Copyright 2015 Ettus Research LLC
+//
+// This program 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 of the License, or
+// (at your option) any later version.
+//
+// This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "expression.hpp"
+#include <boost/shared_ptr.hpp>
+#include <boost/function.hpp>
+#include <vector>
+
+#ifndef INCLUDED_LIBUHD_RFNOC_NOCSCRIPT_FUNCTABLE_HPP
+#define INCLUDED_LIBUHD_RFNOC_NOCSCRIPT_FUNCTABLE_HPP
+
+namespace uhd { namespace rfnoc { namespace nocscript {
+
+class function_table
+{
+  public:
+    typedef boost::shared_ptr<function_table> sptr;
+    typedef boost::function<expression_literal(expression_container::expr_list_type&)> function_ptr;
+
+    static sptr make();
+    virtual ~function_table() {};
+
+    /*! Check if any function with a given name exists
+     *
+     * \returns True, if any function with name \p name is registered.
+     */
+    virtual bool function_exists(const std::string &name) const = 0;
+
+    /*! Check if a function with a given name and list of argument types exists
+     *
+     * \returns True, if such a function is registered.
+     */
+    virtual bool function_exists(
+            const std::string &name,
+            const expression_function::argtype_list_type &arg_types
+    ) const = 0;
+
+    /*! Get the return type of a function with given name and argument type list
+     *
+     * \returns The function's return type
+     * \throws uhd::syntax_error if no such function is registered
+     */
+    virtual expression::type_t get_type(
+            const std::string &name,
+            const expression_function::argtype_list_type &arg_types
+    ) const = 0;
+
+    /*! Calls the function \p name with the argument list \p arguments
+     *
+     * \param arg_types A list of types for each argument
+     * \param arguments An expression list of the arguments
+     * \returns The return value of the called function
+     * \throws uhd::syntax_error if no such function is found
+     */
+    virtual expression_literal eval(
+            const std::string &name,
+            const expression_function::argtype_list_type &arg_types,
+            expression_container::expr_list_type &arguments
+    ) = 0;
+
+    /*! Register a new function
+     *
+     * \param name Name of the function (e.g. 'ADD')
+     * \param ptr Function object
+     * \param return_type The function's return value
+     * \param sig The function signature (list of argument types)
+     */
+    virtual void register_function(
+            const std::string &name,
+            const function_ptr &ptr,
+            const expression::type_t return_type,
+            const expression_function::argtype_list_type &sig
+    ) = 0;
+};
+
+}}} /* namespace uhd::rfnoc::nocscript */
+
+#endif /* INCLUDED_LIBUHD_RFNOC_NOCSCRIPT_FUNCTABLE_HPP */
+// vim: sw=4 et: