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diff --git a/src/Bottleneck_distance/include/gudhi/Internal_point.h b/src/Bottleneck_distance/include/gudhi/Internal_point.h
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+++ b/src/Bottleneck_distance/include/gudhi/Internal_point.h
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author:       Francois Godi
+ *
+ *    Copyright (C) 2015  INRIA (France)
+ *
+ *    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/>.
+ */
+
+#ifndef INTERNAL_POINT_H_
+#define INTERNAL_POINT_H_
+
+namespace Gudhi {
+
+namespace persistence_diagram {
+
+/** \internal \brief Returns the used index for encoding none of the points */
+int null_point_index();
+
+/** \internal \typedef \brief Internal_point is the internal points representation, indexes used outside. */
+struct Internal_point {
+    double vec[2];
+    int point_index;
+    Internal_point() {}
+    Internal_point(double x, double y, int p_i) { vec[0]=x; vec[1]=y; point_index = p_i; }
+    double x() const { return vec[ 0 ]; }
+    double y() const { return vec[ 1 ]; }
+    double& x() { return vec[ 0 ]; }
+    double& y() { return vec[ 1 ]; }
+    bool operator==(const Internal_point& p) const
+    {
+        return point_index==p.point_index;
+    }
+    bool  operator!=(const Internal_point& p) const { return !(*this == p); }
+};
+
+inline int null_point_index() {
+    return -1;
+}
+
+struct Construct_coord_iterator {
+    typedef  const double* result_type;
+    const double* operator()(const Internal_point& p) const
+    { return p.vec; }
+    const double* operator()(const Internal_point& p, int)  const
+    { return p.vec+2; }
+};
+
+}  // namespace persistence_diagram
+
+}  // namespace Gudhi
+
+
+
+
+
+#endif  // INTERNAL_POINT_H_