^^&&^^

Edit File: sample_trie_node_update.hpp

// -*- C++ -*-

// Copyright (C) 2005-2018 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/>.

// 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
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/**
 * @file trie_policy/sample_trie_node_update.hpp
 * Contains a samle node update functor.
 */

#ifndef PB_DS_SAMPLE_TRIE_NODE_UPDATOR_HPP
#define PB_DS_SAMPLE_TRIE_NODE_UPDATOR_HPP

namespace __gnu_pbds
{
  /// A sample node updator.
  template<typename Node_CItr, typename Node_Itr,
	   typename _ATraits, typename _Alloc>
  class sample_trie_node_update
  {
  public:
    typedef std::size_t 		metadata_type;

protected:
    /// Default constructor.
    sample_trie_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_const_iterator) const;
  };
}
#endif // #ifndef PB_DS_SAMPLE_TRIE_NODE_UPDATOR_HPP