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+/* This file is part of the Gudhi hiLibrary. The Gudhi library
+ * (Geometric Understanding in Higher Dimensions) is a generic C++
+ * library for computational topology.
+ *
+ * Author(s): Pawel Dlotko
+ *
+ * Copyright (C) 2016 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 PERSISTENCE_INTERVALS_WITH_DISTANCES_H_
+#define PERSISTENCE_INTERVALS_WITH_DISTANCES_H_
+
+#include <gudhi/Persistence_intervals.h>
+#include <gudhi/Bottleneck.h>
+
+#include <limits>
+
+namespace Gudhi {
+namespace Persistence_representations {
+
+class Persistence_intervals_with_distances : public Persistence_intervals {
+ public:
+ using Persistence_intervals::Persistence_intervals;
+
+ /**
+ *Computations of distance from the current persistnce diagram to the persistence diagram given as a parameter of this
+ *function.
+ *The last but one parameter, power, is here in case we would like to compute p=th Wasserstein distance. At the
+ *moment, this method only implement Bottleneck distance,
+ * which is infinity Wasserstein distance. Therefore any power which is not the default std::numeric_limits< double
+ *>::max() will be ignored and an
+ * exception will be thrown.
+ * The last parameter, tolerance, it is an additiv error of the approimation, set by default to zero.
+ **/
+ double distance(const Persistence_intervals_with_distances& second, double power = std::numeric_limits<double>::max(),
+ double tolerance = (std::numeric_limits<double>::min)()) const {
+ if (power >= std::numeric_limits<double>::max()) {
+ return Gudhi::persistence_diagram::bottleneck_distance(this->intervals, second.intervals, tolerance);
+ } else {
+ std::cerr << "At the moment Gudhi do not support Wasserstein distances. We only support Bottleneck distance."
+ << std::endl;
+ throw "At the moment Gudhi do not support Wasserstein distances. We only support Bottleneck distance.";
+ }
+ }
+};
+
+} // namespace Persistence_representations
+} // namespace Gudhi
+
+#endif // PERSISTENCE_INTERVALS_WITH_DISTANCES_H_