diff --git a/eo/src/utils/eoDistance.h b/eo/src/utils/eoDistance.h
new file mode 100644
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+++ b/eo/src/utils/eoDistance.h
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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+//-----------------------------------------------------------------------------
+// eoDistance.h
+// (c) GeNeura Team, 1998, Marc Schoenauer 2001
+/* 
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    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
+
+    Contact: todos@geneura.ugr.es, http://geneura.ugr.es
+             Marc.Schoenauer@polytechnique.fr
+ */
+//-----------------------------------------------------------------------------
+
+#ifndef _eoDistance_H
+#define _eoDistance_H
+
+#include <eoFunctor.h>
+
+/** 
+    This is a generic class for distance functors:
+    takes 2 things ane returns a double
+*/
+template< class EOT >
+class eoDistance : public eoBF<const EOT &, const EOT &, double>
+{};
+
+/** 
+    This is a generic class for Euclidain distance computation:
+    assumes the 2 things are vectors of something that is double-castable
+*/
+
+template< class T >
+class eoQuadDistance : public eoDistance<vector<T> >
+{
+public:
+  double operator()(const vector<T> & _v1, const vector<T> & _v2)
+  {
+    double sum=0.0;
+    for (unsigned i=0; i<_v1.size(); i++)
+      {
+	double r = static_cast<double> (_v1[i]) - static_cast<double> (_v2[i]);
+	sum += r*r;
+      }
+    return sum;
+  }
+};
+
+
+
+	
+#endif