55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
// 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)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Hash_map/include/CGAL/Handle_hash_function.h $
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// $Id: Handle_hash_function.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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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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