1// -*- C++ -*-
2
3// Copyright (C) 2005-2015 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.
10
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.
15
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.
19
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.
26
27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
29// notice appears in all copies, and that both that copyright notice
30// and this permission notice appear in supporting documentation. None
31// of the above authors, nor IBM Haifa Research Laboratories, make any
32// representation about the suitability of this software for any
33// purpose. It is provided "as is" without express or implied
34// warranty.
35
36/**
37 * @file sample_range_hashing.hpp
38 * Contains a range hashing policy.
39 */
40
41#ifndef PB_DS_SAMPLE_RANGE_HASHING_HPP
42#define PB_DS_SAMPLE_RANGE_HASHING_HPP
43
44namespace __gnu_pbds
45{
46  /// A sample range-hashing functor.
47  class sample_range_hashing
48  {
49  public:
50    /// Size type.
51    typedef std::size_t size_type;
52
53    /// Default constructor.
54    sample_range_hashing();
55
56    /// Copy constructor.
57    sample_range_hashing(const sample_range_hashing& other);
58
59    /// Swaps content.
60    inline void
61    swap(sample_range_hashing& other);
62
63  protected:
64    /// Notifies the policy object that the container's size has
65    /// changed to argument's size.
66    void
67    notify_resized(size_type);
68
69    /// Transforms the __hash value hash into a ranged-hash value.
70    inline size_type
71    operator()(size_type ) const;
72  };
73}
74#endif // #ifndef PB_DS_SAMPLE_RANGE_HASHING_HPP
75