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

// -*- C++ -*-

// Copyright (C) 2005-2020 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_resize_policy.hpp
 * Contains a sample resize policy for hash tables.
 */

#ifndef PB_DS_SAMPLE_RESIZE_POLICY_HPP
#define PB_DS_SAMPLE_RESIZE_POLICY_HPP

namespace __gnu_pbds
{
  /// A sample resize policy.
  class sample_resize_policy
  {
  public:
    /// Size type.
    typedef std::size_t size_type;

    /// Default constructor.
    sample_resize_policy();

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

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

  protected:
    /// Notifies a search started.
    inline void
    notify_insert_search_start();

    /// Notifies a search encountered a collision.
    inline void
    notify_insert_search_collision();

    /// Notifies a search ended.
    inline void
    notify_insert_search_end();

    /// Notifies a search started.
    inline void
    notify_find_search_start();

    /// Notifies a search encountered a collision.
    inline void
    notify_find_search_collision();

    /// Notifies a search ended.
    inline void
    notify_find_search_end();

    /// Notifies a search started.
    inline void
    notify_erase_search_start();

    /// Notifies a search encountered a collision.
    inline void
    notify_erase_search_collision();

    /// Notifies a search ended.
    inline void
    notify_erase_search_end();

    /// Notifies an element was inserted.
    inline void
    notify_inserted(size_type num_e);

    /// Notifies an element was erased.
    inline void
    notify_erased(size_type num_e);

    /// Notifies the table was cleared.
    void
    notify_cleared();

    /// Notifies the table was resized to new_size.
    void
    notify_resized(size_type new_size);

    /// Queries whether a resize is needed.
    inline bool
    is_resize_needed() const;

    /// Queries what the new size should be.
    size_type
    get_new_size(size_type size, size_type num_used_e) const;
  };
}
#endif