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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):       Pawel Dlotko
+ *
+ *    Copyright (C) 2016 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef CONCEPT_REAL_VALUED_TOPOLOGICAL_DATA_H_
+#define CONCEPT_REAL_VALUED_TOPOLOGICAL_DATA_H_
+
+namespace Gudhi {
+
+namespace Persistence_representations {
+
+/** \brief The concept Real_valued_topological_data describes the requirements
+  * for a type to implement a container that allows computations of its projections to R.
+  */
+class Real_valued_topological_data {
+ public:
+  /**
+* Typically there are various ways data can be projected to R. This function gives us the number of functions for
+* vectorization provided by a given class.
+  **/
+  size_t number_of_projections_to_R();
+  /**
+* This is a function to compute the projection from this container to reals. The parameter of a function have to
+* be between 0 and the value returned by number_of_projections_to_R().
+**/
+  double project_to_R(size_t number_of_projection);
+};
+
+}  // namespace Persistence_representations
+
+}  // namespace Gudhi
+
+#endif  // CONCEPT_REAL_VALUED_TOPOLOGICAL_DATA_H_