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diff --git a/src/Alpha_complex/include/gudhi/Alpha_complex_options.h b/src/Alpha_complex/include/gudhi/Alpha_complex_options.h
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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 ALPHA_COMPLEX_OPTIONS_H_
+#define ALPHA_COMPLEX_OPTIONS_H_
+
+
+#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
+#include <CGAL/Delaunay_triangulation_3.h>
+#include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
+#include <CGAL/Periodic_3_Delaunay_triangulation_3.h>
+#include <CGAL/Periodic_3_regular_triangulation_traits_3.h>
+#include <CGAL/Periodic_3_regular_triangulation_3.h>
+#include <CGAL/Regular_triangulation_3.h>
+#include <CGAL/Alpha_shape_3.h>
+#include <CGAL/Alpha_shape_cell_base_3.h>
+#include <CGAL/Alpha_shape_vertex_base_3.h>
+
+
+namespace Gudhi {
+
+namespace alpha_complex {
+
+
+/**
+ * \class complexity
+ * \brief Alpha complex complexity template parameter possible values.
+ *
+ * \ingroup alpha_complex
+ */
+enum class complexity: char
+{
+  /** \brief Fast version.*/
+  fast='f',
+  /** \brief Safe version.*/
+  safe='s',
+  /** \brief Exact version.*/
+  exact='e',
+};
+
+}  // namespace alpha_complex
+
+}  // namespace Gudhi
+
+#endif  // ALPHA_COMPLEX_OPTIONS_H_