^^&&^^

Edit File: null_node_metadata.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
// 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 branch_policy/null_node_metadata.hpp
 * Contains an implementation class for tree-like classes.
 */

#ifndef PB_DS_0_NODE_METADATA_HPP
#define PB_DS_0_NODE_METADATA_HPP

#include <ext/pb_ds/detail/types_traits.hpp>

namespace __gnu_pbds
{
  namespace detail
  {
    /// Constant node iterator.
    template<typename Key, typename Data, typename _Alloc>
      struct dumnode_const_iterator
      {
      private:
	typedef types_traits<Key, Data, _Alloc, false>	__traits_type;
	typedef typename __traits_type::pointer        	const_iterator;
	
      public:
	typedef const_iterator 				value_type;
	typedef const_iterator 				const_reference;
	typedef const_reference 	       		reference;
      };
  } // namespace detail
} // namespace __gnu_pbds

#endif