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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:       François Godi
+ *
+ *    Copyright (C) 2015  INRIA
+ *
+ *    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 CONCEPT_BOTTLENECK_DISTANCE_PERSISTENCE_DIAGRAM_H_
+#define CONCEPT_BOTTLENECK_DISTANCE_PERSISTENCE_DIAGRAM_H_
+
+namespace Gudhi {
+
+namespace persistence_diagram {
+
+/** \brief Concept of point in a persistence diagram. std::get<0>(point) must return the birth of the corresponding component and std::get<1>(point) its death.
+ * Both should be convertible to `double`.
+ * A valid implementation of this concept is std::pair<double,double>.
+ * Death should be larger than birth, death can be std::numeric_limits<double>::infinity() for components which stay alive.
+ *
+ * \ingroup bottleneck_distance
+ */
+struct DiagramPoint{};
+
+/** \brief Concept of persistence diagram. It is a range of `DiagramPoint`.
+ * std::begin(diagram) and std::end(diagram) must return corresponding iterators.
+ *
+ * \ingroup bottleneck_distance
+ */
+struct PersistenceDiagram{};
+
+}  // namespace persistence_diagram
+
+}  // namespace Gudhi
+
+#endif  // CONCEPT_BOTTLENECK_DISTANCE_PERSISTENCE_DIAGRAM_H_