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

// -*- C++ -*-

// Copyright (C) 2005-2019 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
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.

/**
 * @file sample_probe_fn.hpp
 * Contains a sample probe policy.
 */

#ifndef PB_DS_SAMPLE_PROBE_FN_HPP
#define PB_DS_SAMPLE_PROBE_FN_HPP

namespace __gnu_pbds
{
  /// A sample probe policy.
  class sample_probe_fn
  {
  public:
    typedef std::size_t size_type;

    /// Default constructor.
    sample_probe_fn();

    /// Copy constructor.
    sample_probe_fn(const sample_probe_fn&);

    /// Swaps content.
    inline void
    swap(sample_probe_fn&);

  protected:
    /// Returns the i-th offset from the hash value of some key r_key.
    inline size_type
    operator()(key_const_reference r_key, size_type i) const;
  };
}
#endif // #ifndef PB_DS_SAMPLE_PROBE_FN_HPP