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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 trees.
 */
 
#ifndef PB_DS_TREE_NODE_METADATA_SELECTOR_HPP
#define PB_DS_TREE_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 tree_metadata_helper
    {
      typedef typename Node_Update::metadata_type type;
    };
 
    template<typename Node_Update>
    struct tree_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 tree_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_tree_node_update<
	  dumconst_node_it,
	  dumconst_node_it,
	  Cmp_Fn,
	  Allocator> >::value
	};
 
    public:
      typedef
      typename tree_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_TREE_NODE_METADATA_SELECTOR_HPP