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diff --git a/include/gudhi/Skeleton_blocker/Skeleton_blocker_complex_visitor.h b/include/gudhi/Skeleton_blocker/Skeleton_blocker_complex_visitor.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(s):       David Salinas
+ *
+ *    Copyright (C) 2014  INRIA Sophia Antipolis-Mediterranee (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 SKELETON_BLOCKER_SKELETON_BLOCKER_COMPLEX_VISITOR_H_
+#define SKELETON_BLOCKER_SKELETON_BLOCKER_COMPLEX_VISITOR_H_
+
+#include <gudhi/Skeleton_blocker/Skeleton_blocker_simplex.h>
+
+namespace Gudhi {
+
+namespace skeleton_blocker {
+// todo rajouter les const
+
+/**
+ *@class Skeleton_blocker_complex_visitor
+ *@brief Interface for a visitor of a simplicial complex.
+ */
+template<typename Vertex_handle>
+class Skeleton_blocker_complex_visitor {
+ public:
+  virtual ~Skeleton_blocker_complex_visitor() {}
+
+  virtual void on_add_vertex(Vertex_handle) = 0;
+  virtual void on_remove_vertex(Vertex_handle) = 0;
+
+  virtual void on_add_edge_without_blockers(Vertex_handle a, Vertex_handle b) = 0;
+  virtual void on_remove_edge(Vertex_handle a, Vertex_handle b) = 0;
+
+  /**
+   * @brief Called when an edge changes, during the contraction of
+   * an edge
+   */
+  virtual void on_changed_edge(Vertex_handle a, Vertex_handle b) = 0;
+
+  /**
+   * @brief Called when performing an edge contraction when
+   * an edge bx is replaced by an edge ax (not already present).
+   * Precisely, this methods is called this way in contract_edge :
+   * add_edge_without_blockers(a,x)
+   * on_swaped_edge(a,b,x)
+   * remove_edge(b,x)
+   */
+  virtual void on_swaped_edge(Vertex_handle a, Vertex_handle b,
+                              Vertex_handle x) = 0;
+  virtual void on_add_blocker(
+      const Skeleton_blocker_simplex<Vertex_handle>&) = 0;
+  virtual void on_delete_blocker(
+      const Skeleton_blocker_simplex<Vertex_handle>*) = 0;
+};
+
+/**
+ *@class Dummy_complex_visitor
+ *@brief A dummy visitor of a simplicial complex that does nothing
+ *
+ */
+template<typename Vertex_handle>
+class Dummy_complex_visitor : public Skeleton_blocker_complex_visitor<
+    Vertex_handle> {
+ public:
+  void on_add_vertex(Vertex_handle) {
+  }
+  void on_remove_vertex(Vertex_handle) {
+  }
+  void on_add_edge_without_blockers(Vertex_handle a, Vertex_handle b) {
+  }
+  void on_remove_edge(Vertex_handle a, Vertex_handle b) {
+  }
+  void on_changed_edge(Vertex_handle a, Vertex_handle b) {
+  }
+  void on_swaped_edge(Vertex_handle a, Vertex_handle b, Vertex_handle x) {
+  }
+  void on_add_blocker(const Skeleton_blocker_simplex<Vertex_handle>&) {
+  }
+  void on_delete_blocker(const Skeleton_blocker_simplex<Vertex_handle>*) {
+  }
+};
+
+/**
+ *@class Print_complex_visitor
+ *@brief A visitor that prints the visit information.
+ *
+ */
+template<typename Vertex_handle>
+class Print_complex_visitor : public Skeleton_blocker_complex_visitor<
+    Vertex_handle> {
+ public:
+  void on_add_vertex(Vertex_handle v) {
+    std::cerr << "on_add_vertex:" << v << std::endl;
+  }
+  void on_remove_vertex(Vertex_handle v) {
+    std::cerr << "on_remove_vertex:" << v << std::endl;
+  }
+  void on_add_edge_without_blockers(Vertex_handle a, Vertex_handle b) {
+    std::cerr << "on_add_edge_without_blockers:" << a << "," << b << std::endl;
+  }
+  void on_remove_edge(Vertex_handle a, Vertex_handle b) {
+    std::cerr << "on_remove_edge:" << a << "," << b << std::endl;
+  }
+  void on_changed_edge(Vertex_handle a, Vertex_handle b) {
+    std::cerr << "on_changed_edge:" << a << "," << b << std::endl;
+  }
+  void on_swaped_edge(Vertex_handle a, Vertex_handle b, Vertex_handle x) {
+    std::cerr << "on_swaped_edge:" << a << "," << b << "," << x << std::endl;
+  }
+  void on_add_blocker(const Skeleton_blocker_simplex<Vertex_handle>& b) {
+    std::cerr << "on_add_blocker:" << b << std::endl;
+  }
+  void on_delete_blocker(const Skeleton_blocker_simplex<Vertex_handle>* b) {
+    std::cerr << "on_delete_blocker:" << b << std::endl;
+  }
+};
+
+}  // namespace skeleton_blocker
+
+namespace skbl = skeleton_blocker;
+
+}  // namespace Gudhi
+
+#endif  // SKELETON_BLOCKER_SKELETON_BLOCKER_COMPLEX_VISITOR_H_