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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 - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author:       Francois Godi
+ *
+ *    Copyright (C) 2015 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#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_