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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(s):       Vincent Rouvreau
+ *
+ *    Copyright (C) 2018 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_CECH_COMPLEX_SIMPLICIAL_COMPLEX_FOR_CECH_H_
+#define CONCEPT_CECH_COMPLEX_SIMPLICIAL_COMPLEX_FOR_CECH_H_
+
+namespace Gudhi {
+
+namespace cech_complex {
+
+/** \brief The concept SimplicialComplexForCech describes the requirements for a type to implement a simplicial
+ * complex, that can be created from a `Cech_complex`.
+ */
+struct SimplicialComplexForCech {
+  /** Handle to specify a simplex. */
+  typedef unspecified Simplex_handle;
+  /** Handle to specify a vertex. Must be a non-negative integer. */
+  typedef unspecified Vertex_handle;
+  /** Handle to specify the simplex filtration value. */
+  typedef unspecified Filtration_value;
+
+  /** Assigns the 'simplex' with the given 'filtration' value. */
+  int assign_filtration(Simplex_handle simplex, Filtration_value filtration);
+
+  /** \brief Returns a range over vertices of a given
+   *  simplex. */
+  Simplex_vertex_range simplex_vertex_range(Simplex_handle const & simplex);
+
+  /** \brief Inserts a given `Gudhi::ProximityGraph` in the simplicial complex. */
+  template<class ProximityGraph>
+  void insert_graph(const ProximityGraph& proximity_graph);
+
+  /** \brief Expands the simplicial complex containing only its one skeleton until a given maximal dimension.
+   * expansion can be blocked by the blocker oracle. */
+  template< typename Blocker >
+  void expansion_with_blockers(int max_dim, Blocker block_simplex);
+
+  /** Returns the number of vertices in the simplicial complex. */
+  std::size_t num_vertices();
+
+};
+
+}  // namespace alpha_complex
+
+}  // namespace Gudhi
+
+#endif  // CONCEPT_ALPHA_COMPLEX_SIMPLICIAL_COMPLEX_FOR_ALPHA_H_