// -*- C++ -*-

// Copyright (C) 2005-2022 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 tree_policy/sample_tree_node_update.hpp
 * Contains a samle node update functor.
 */

#ifndef PB_DS_SAMPLE_TREE_NODE_UPDATOR_HPP
#define PB_DS_SAMPLE_TREE_NODE_UPDATOR_HPP

namespace __gnu_pbds
{
  /// A sample node updator.
  template<typename Const_Node_Iter, typename Node_Iter, typename Cmp_Fn,
	   typename _Alloc>
  class sample_tree_node_update
  {
    typedef std::size_t metadata_type;

    /// Default constructor.
    sample_tree_node_update();

    /// Updates the rank of a node through a node_iterator node_it;
    /// end_nd_it is the end node iterator.
    inline void
    operator()(node_iterator node_it, node_const_iterator end_nd_it) const;
  };
}
#endif // #ifndef PB_DS_SAMPLE_TREE_NODE_UPDATOR_HPP