--- /dev/null	
+++ scsolver/source/inc/numeric/funcobj.hxx	
@@ -0,0 +1,65 @@
+/*************************************************************************
+ *
+ *  The Contents of this file are made available subject to
+ *  the terms of GNU Lesser General Public License Version 2.1.
+ *
+ *
+ *    GNU Lesser General Public License Version 2.1
+ *    =============================================
+ *    Copyright 2005 by Kohei Yoshida.
+ *    1039 Kingsway Dr., Apex, NC 27502, USA
+ *
+ *    This library is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU Lesser General Public
+ *    License version 2.1, as published by the Free Software Foundation.
+ *
+ *    This library 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
+ *    Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with this library; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *    MA  02111-1307  USA
+ *
+ ************************************************************************/
+
+#ifndef _SCSOLVER_NUMERIC_FUNCOBJ_HXX_
+#define _SCSOLVER_NUMERIC_FUNCOBJ_HXX_
+
+#include <vector>
+#include <string>
+
+namespace scsolver { namespace numeric {
+
+/**
+ * Base class for function object to be used for NLP algorithms.
+ */
+class BaseFuncObj
+{
+public:
+	BaseFuncObj();
+	virtual ~BaseFuncObj() throw() = 0;
+
+	/**
+     * Take an array of variables and return the answer.
+	 * 
+	 * @return double
+	 */
+	virtual double operator()( const std::vector<double>& ) const = 0;
+
+	/**
+     * Return a display-friendly function string.
+	 * 
+	 * @return std::string
+	 */
+	virtual std::string getFuncString() const = 0;
+
+	double eval( const std::vector<double>& ) const;
+};
+
+}}
+
+#endif
+
