libstdc++: mod_based_range_hashing.hpp Source File

libstdc++

mod_based_range_hashing.hpp
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1// -*- C++ -*-
2
3// Copyright (C) 2005-2026 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the terms
7// of the GNU General Public License as published by the Free Software
8// Foundation; either version 3, or (at your option) any later
9// version.
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11// This library is distributed in the hope that it will be useful, but
12// WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14// General Public License for more details.
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16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
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20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
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35
36/**
37 * @file mod_based_range_hashing.hpp
38 * Contains a range hashing policy base.
39 */
40
41#ifndef PB_DS_MOD_BASED_RANGE_HASHING_HPP
42#define PB_DS_MOD_BASED_RANGE_HASHING_HPP
43
44namespace __gnu_pbds
45{
46 namespace detail
47 {
48 /// Mod based range hashing.
49 template<typename Size_Type>
50 class mod_based_range_hashing
51 {
52 protected:
53 typedef Size_Type size_type;
54
55 void
56 swap(mod_based_range_hashing& other)
57 { std::swap(m_size, other.m_size); }
58
59 void
60 notify_resized(size_type s)
61 { m_size = s; }
62
63 inline size_type
64 range_hash(size_type s) const
65 { return s % m_size; }
66
67 private:
68 size_type m_size;
69 };
70 } // namespace detail
71
72} // namespace __gnu_pbds
73
74#endif // #ifndef PB_DS_MOD_BASED_RANGE_HASHING_HPP
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition assoc_container.hpp:52
__gnu_pbds::detail::mod_based_range_hashing
Mod based range hashing.
Definition mod_based_range_hashing.hpp:51