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diff --git a/src/Contraction/include/gudhi/Contraction/policies/Placement_policy.h b/src/Contraction/include/gudhi/Contraction/policies/Placement_policy.h
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+++ b/src/Contraction/include/gudhi/Contraction/policies/Placement_policy.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(s):       David Salinas
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef CONTRACTION_POLICIES_PLACEMENT_POLICY_H_
+#define CONTRACTION_POLICIES_PLACEMENT_POLICY_H_
+
+#include <boost/optional.hpp>
+
+namespace Gudhi {
+
+namespace contraction {
+
+/**
+ *@brief Policy to specify where the merged point had to be placed after an edge contraction. 
+ *@ingroup contr
+ */
+template< typename EdgeProfile>
+class Placement_policy {
+ public:
+  typedef typename EdgeProfile::Point Point;
+  typedef boost::optional<Point> Placement_type;
+
+  virtual Placement_type operator()(const EdgeProfile& profile) const = 0;
+
+  virtual ~Placement_policy() { }
+};
+
+}  // namespace contraction
+
+}  // namespace Gudhi
+
+#endif  // CONTRACTION_POLICIES_PLACEMENT_POLICY_H_