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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):       Siargey Kachanovich
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef CONCEPT_WITNESS_COMPLEX_SIMPLICIAL_COMPLEX_FOR_WITNESS_H_
+#define CONCEPT_WITNESS_COMPLEX_SIMPLICIAL_COMPLEX_FOR_WITNESS_H_
+
+namespace Gudhi {
+
+namespace witness_complex {
+
+/** \brief The concept SimplicialComplexForWitness describes the requirements 
+ * for a type to implement a simplicial complex, 
+ * used for example to build a Witness_complex or Strong_witness_complex. 
+ */
+struct SimplicialComplexForWitness {
+  /** Handle to specify a simplex. */
+  typedef unspecified Simplex_handle;
+  // /** Handle to specify a vertex. Must be a non-negative integer. */
+  // typedef unspecified Vertex_handle;
+
+  /** \brief Returns a Simplex_hanlde that is different from all simplex handles 
+   * of the simplices. */
+  Simplex_handle null_simplex();
+
+  /** Returns the number of vertices in the simplicial complex
+   */
+  std::size_t num_vertices();
+  
+  /** \brief Return type of an insertion of a simplex
+   */
+  typedef unspecified Insertion_result_type;
+
+  /** \brief Inserts a simplex with vertices from a given range
+   *  'vertex_range' in the simplicial complex.
+   *  The function is only used in Witness_complex class
+   *  and by construction, it is not necessary to check if 
+   *  the faces are in the simplicial complex before insertion. 
+   *  The simplex is given the filtration value 'filtration'.
+   *  Filtration_value should be convertible from double.
+   *  The return type is not used.
+   *  */
+  template< typedef Input_vertex_range >
+  Insertion_result_type insert_simplex(Input_vertex_range const & vertex_range, Filtration_value filtration);
+
+  /** \brief Inserts a simplex and all its faces
+   *  with vertices from a given range
+   *  'vertex_range' in the simplicial complex.
+   *  The function is only used in Strong_witness_complex class.
+   *  All inserted simplices are given the filtration
+   *  value 'filtration'.
+   *  Filtration_value should be convertible from double.
+   *  The return type is not used.
+   */
+
+  template< typedef Input_vertex_range,
+            typedef Filtration_value>
+  Insertion_result_type insert_simplex_and_subfaces(Input_vertex_range const & vertex_range, Filtration_value filtration);
+  
+  /** \brief Finds a simplex with vertices given by a range
+   *
+   * If a simplex exists, its Simplex_handle is returned.
+   * Otherwise null_simplex() is returned. */
+  template< typedef Input_vertex_range >
+  Simplex_handle find(Input_vertex_range const & vertex_range);
+
+  /** \brief Sets the dimension of the simplicial complex to 
+   * 'dimension'.
+   */
+  void set_dimension(int dimension);
+
+  /** \brief Returns the filtration of the simplex given by
+   *  the simplex handle 'sh'.
+   */
+  double filtration(Simplex_handle sh);
+};
+
+}  // namespace witness_complex
+
+}  // namespace Gudhi
+
+#endif  // CONCEPT_WITNESS_COMPLEX_SIMPLICIAL_COMPLEX_FOR_WITNESS_H_