Include CGAL/unary_function.h

Installation/include/CGAL/config.h

@@ -259,6 +259,13 @@
 #define CGAL_CFG_NO_STD_HASH 1
 #endif
 
+
+//----------------------------------------------------------------------//
+//  As std::unary_function is deprecated we unse internally CGAL::unary_function
+//----------------------------------------------------------------------//
+
+#include <CGAL/unary_function.h>
+
 //----------------------------------------------------------------------//
 //  auto-link the CGAL library on platforms that support it
 //----------------------------------------------------------------------//

STL_Extension/include/CGAL/unary_function.h

@@ -0,0 +1,38 @@
+// Copyright (c) 2017  
+// Utrecht University (The Netherlands),
+// ETH Zurich (Switzerland),
+// INRIA Sophia-Antipolis (France),
+// Max-Planck-Institute Saarbruecken (Germany),
+// and Tel-Aviv University (Israel).  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.
+//
+// $URL$
+// $Id$
+// 
+//
+// Author(s)     : Andreas Fabri
+
+#ifndef CGAL_UNARY_FUNCTION_H
+#define CGAL_UNARY_FUNCTION_H
+
+namespace CGAL {
+
+  template < typename ArgumentType, typename ResultType>
+  struct unary_function {
+    typdef ArgumentType argument_type;
+    typedef ResultType result_type;
+  };
+  
+} // namespace CGAL
+
+#endif // CGAL_UNARY_FUNCTION_H