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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_EDGE_LENGTH_COST_H_
+#define CONTRACTION_POLICIES_EDGE_LENGTH_COST_H_
+
+#include <gudhi/Contraction/policies/Cost_policy.h>
+
+namespace Gudhi {
+
+namespace contraction {
+
+/**
+ * @brief return a cost corresponding to the squared length of the edge
+ */
+template< typename EdgeProfile>
+class Edge_length_cost : public Cost_policy<EdgeProfile> {
+ public:
+ typedef typename Cost_policy<EdgeProfile>::Cost_type Cost_type;
+ typedef typename EdgeProfile::Point Point;
+
+ Cost_type operator()(const EdgeProfile& profile, const boost::optional<Point>& placement) const override {
+ double res = 0;
+ auto p0_coord = profile.p0().begin();
+ auto p1_coord = profile.p1().begin();
+ for (; p0_coord != profile.p0().end(); p0_coord++, p1_coord++) {
+ res += (*p0_coord - *p1_coord) * (*p0_coord - *p1_coord);
+ }
+ return res;
+ }
+};
+
+} // namespace contraction
+
+} // namespace Gudhi
+
+#endif // CONTRACTION_POLICIES_EDGE_LENGTH_COST_H_