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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 - 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):       Vincent Rouvreau
+ *
+ *    Copyright (C) 2018 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef ALPHA_COMPLEX_OPTIONS_H_
+#define ALPHA_COMPLEX_OPTIONS_H_
+
+namespace Gudhi {
+
+namespace alpha_complex {
+
+/**
+ * \brief Alpha complex complexity template parameter possible values.
+ *
+ * \ingroup alpha_complex
+ */
+enum class complexity : char {
+  FAST = 'f',   ///< Fast version.
+  SAFE = 's',   ///< Safe version.
+  EXACT = 'e',  ///< Exact version.
+};
+
+}  // namespace alpha_complex
+
+}  // namespace Gudhi
+
+#endif  // ALPHA_COMPLEX_OPTIONS_H_