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[thirdparty/gcc.git] / libstdc++-v3 / include / ext / pb_ds / detail / hash_fn / sample_range_hashing.hpp

// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2010 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, or (at your option) any later
// version.

// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
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/**
 * @file sample_range_hashing.hpp
 * Contains a range hashing policy.
 */

#ifndef PB_DS_SAMPLE_RANGE_HASHING_HPP
#define PB_DS_SAMPLE_RANGE_HASHING_HPP

namespace __gnu_pbds
{
  /// A sample range-hashing functor.
  class sample_range_hashing
  {
  public:
    /// Size type.
    typedef std::size_t size_type;

    /// Default constructor.
    sample_range_hashing();

    /// Copy constructor.
    sample_range_hashing(const sample_range_hashing& other);

    /// Swaps content.
    inline void
    swap(sample_range_hashing& other);

  protected:
    /// Notifies the policy object that the container's size has
    /// changed to argument's size.
    void
    notify_resized(size_type);

    /// Transforms the __hash value hash into a ranged-hash value.
    inline size_type
    operator()(size_type ) const;
  };
}
#endif // #ifndef PB_DS_SAMPLE_RANGE_HASHING_HPP