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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 node_metadata_selector.hpp

 * Contains an implementation class for tries.

 */

#ifndef PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP

#define PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP

#include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>

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

namespace __gnu_pbds

{

  namespace detail

  {

    template<typename Node_Update, bool Null>

    struct trie_metadata_helper

    {

      typedef typename Node_Update::metadata_type type;

    };

    template<typename Node_Update>

    struct trie_metadata_helper<

      Node_Update,

      true>

    {

      typedef null_node_metadata type;

    };

    template<typename Key,

             typename Data,

             class Cmp_Fn,

             template<typename Const_Node_Iterator,

                      class Const_Iterator,

                      class Cmp_Fn_,

                      class Allocator_>

    class Node_Update,

             class Allocator>

    struct trie_node_metadata_selector

    {

    private:

      typedef

      dumconst_node_iterator<

      Key,

      Data,

      Allocator>

      dumconst_node_it;

      enum

        {

          null_update =

          is_same<

          Node_Update<

          dumconst_node_it,

          dumconst_node_it,

          Cmp_Fn,

          Allocator>,

          null_trie_node_update<

          dumconst_node_it,

          dumconst_node_it,

          Cmp_Fn,

          Allocator> >::value

        };

    public:

      typedef

      typename trie_metadata_helper<

      Node_Update<

      dumconst_node_it,

      dumconst_node_it,

      Cmp_Fn,

      Allocator>,

      null_update>::type

      type;

    };

  } // namespace detail

} // namespace __gnu_pbds

#endif // #ifndef PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP