null_node_metadata.hpp

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// -*- C++ -*-
 
// Copyright (C) 2005-2021 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 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