64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
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// Copyright (c) 1997-2000
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 3 of the License,
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// or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0+
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//
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//
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// Author(s) : Michael Seel <seel@mpi-sb.mpg.de>
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// Lutz Kettner <kettner@inf.ethz.ch>
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#ifndef CGAL_HANDLE_HASH_FUNCTION_H
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#define CGAL_HANDLE_HASH_FUNCTION_H
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#include <CGAL/config.h>
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#include <cstddef>
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namespace CGAL {
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//mechanism to abuse Handle_hash_function which is the default
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//template parameter of Unique_hash_map
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namespace internal{
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namespace handle {
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template <class H>
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struct Hash_functor{
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std::size_t
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operator()(const H& h)
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{
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return std::size_t(&*h) /
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sizeof( typename std::iterator_traits<H>::value_type);
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}
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};
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}
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}
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struct Handle_hash_function {
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typedef std::size_t result_type;
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template <class H>
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std::size_t operator() (const H& h) const {
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return ::CGAL::internal::handle::Hash_functor<H>()(h);
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}
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};
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} //namespace CGAL
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#endif // CGAL_HANDLE_HASH_FUNCTION_H
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// EOF
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