Add polygonal schema min item

Surface_mesh_topology/include/CGAL/Polygonal_schema_min_items.h

@@ -0,0 +1,56 @@
+// Copyright (c) 2019 CNRS and LIRIS' Establishments (France).
+// All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation; either version 3 of the License,
+// or (at your option) any later version.
+//
+// Licensees holding a valid commercial license may use this file in
+// accordance with the commercial license agreement provided with the software.
+//
+// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+//
+// $URL$
+// $Id$
+// SPDX-License-Identifier: LGPL-3.0+
+//
+// Author(s)     : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
+//
+#ifndef CGAL_POLYGONAL_SCHEMA_MIN_ITEMS_H
+#define CGAL_POLYGONAL_SCHEMA_MIN_ITEMS_H 1
+
+#include <cstring>
+  
+namespace CGAL {
+
+  /** @file Polygonal_schema_min_items.h
+   * Definition of min item class for Polygonal_schema.
+   */
+
+  /** Minimal items for polygonal schema.
+   * Generic_map_min_items defines what is the minimal item class for a generic map.
+   * One struct associated with darts, having one char* named m_label..
+   */
+  struct Polygonal_schema_min_items
+  {
+    template < class Refs >
+    struct Dart_wrapper
+    {
+      struct Info_for_darts
+      {
+        char* m_label;
+
+        Info_for_darts() : m_label(NULL)
+        {}
+      };
+      
+      typedef Info_for_darts Dart_info;
+    };
+  };
+
+} // namespace CGAL
+
+#endif // CGAL_POLYGONAL_SCHEMA_MIN_ITEMS_H
+// EOF //