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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_ALPHA_COMPLEX_SIMPLICIAL_COMPLEX_FOR_ALPHA_3D_H_
+#define CONCEPT_ALPHA_COMPLEX_SIMPLICIAL_COMPLEX_FOR_ALPHA_3D_H_
+
+namespace Gudhi {
+
+namespace alpha_complex {
+
+/** \brief The concept SimplicialComplexForAlpha3d describes the requirements for a type to implement a simplicial
+ * complex, that can be created from a `Alpha_complex_3d`.
+ */
+struct SimplicialComplexForAlpha3d {
+  /** 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;
+
+  /** Returns the number of vertices in the simplicial complex. */
+  std::size_t num_vertices();
+
+  /** \brief Inserts a simplex from a given simplex (represented by a vector of Vertex_handle) in the
+   * simplicial complex with the given 'filtration' value. */
+  void insert_simplex(std::vector<Vertex_handle> const& vertex_range, Filtration_value filtration);
+
+  /** Browses the simplicial complex to make the filtration non-decreasing. */
+  void make_filtration_non_decreasing();
+
+  /** Prune the simplicial complex above 'filtration' value given as parameter. */
+  void prune_above_filtration(Filtration_value filtration);
+};
+
+}  // namespace alpha_complex
+
+}  // namespace Gudhi
+
+#endif  // CONCEPT_ALPHA_COMPLEX_SIMPLICIAL_COMPLEX_FOR_ALPHA_3D_H_