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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009 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 ov_tree_map_/traits.hpp

 * Contains an implementation class for ov_tree_.

 */

#ifndef PB_DS_OV_TREE_NODE_AND_IT_TRAITS_HPP

#define PB_DS_OV_TREE_NODE_AND_IT_TRAITS_HPP

#include <ext/pb_ds/detail/ov_tree_map_/node_iterators.hpp>

namespace __gnu_pbds

{

  namespace detail

  {

    /// Tree traits.

    /// @ingroup traits

    template<typename Key,

             typename Mapped,

             class Cmp_Fn,

             template<typename Node_CItr,

                      class Node_Itr,

                      class Cmp_Fn_,

                      typename _Alloc_>

    class Node_Update,

             typename _Alloc>

    struct tree_traits<

      Key,

      Mapped,

      Cmp_Fn,

      Node_Update,

      ov_tree_tag,

      _Alloc>

    {

    private:

      typedef

      typename types_traits<

      Key,

      Mapped,

      _Alloc,

      false>::value_type

      value_type;

    public:

      typedef

      typename tree_node_metadata_dispatch<

      Key,

      Mapped,

      Cmp_Fn,

      Node_Update,

      _Alloc>::type

      metadata_type;

      /// This is an iterator to an iterator: it iterates over nodes,

      /// and de-referencing it returns one of the tree's iterators.

      typedef

      ov_tree_node_const_it_<

        value_type,

        metadata_type,

        _Alloc>

      node_const_iterator;

      typedef

      ov_tree_node_it_<

        value_type,

        metadata_type,

        _Alloc>

      node_iterator;

      typedef

      Node_Update<

        node_const_iterator,

        node_iterator,

        Cmp_Fn,

        _Alloc>

      node_update;

      typedef

      __gnu_pbds::null_node_update<

        node_const_iterator,

        node_iterator,

        Cmp_Fn,

        _Alloc>*

      null_node_update_pointer;

    };

    /// Specialization.

    /// @ingroup traits

    template<typename Key,

             class Cmp_Fn,

             template<typename Node_CItr,

                      class Node_Itr,

                      class Cmp_Fn_,

                      typename _Alloc_>

    class Node_Update,

             typename _Alloc>

    struct tree_traits<

      Key,

      null_type,

      Cmp_Fn,

      Node_Update,

      ov_tree_tag,

      _Alloc>

    {

    private:

      typedef

      typename types_traits<

      Key,

      null_type,

      _Alloc,

      false>::value_type

      value_type;

    public:

      typedef

      typename tree_node_metadata_dispatch<

      Key,

      null_type,

      Cmp_Fn,

      Node_Update,

      _Alloc>::type

      metadata_type;

      /// This is an iterator to an iterator: it iterates over nodes,

      /// and de-referencing it returns one of the tree's iterators.

      typedef

      ov_tree_node_const_it_<

        value_type,

        metadata_type,

        _Alloc>

      node_const_iterator;

      typedef node_const_iterator node_iterator;

      typedef

      Node_Update<

        node_const_iterator,

        node_const_iterator,

        Cmp_Fn,

        _Alloc>

      node_update;

      typedef

      __gnu_pbds::null_node_update<

        node_const_iterator,

        node_iterator,

        Cmp_Fn,

        _Alloc>*

      null_node_update_pointer;

    };

  } // namespace detail

} // namespace __gnu_pbds

#endif // #ifndef PB_DS_OV_TREE_NODE_AND_IT_TRAITS_HPP