1// -*- C++ -*-
2
3// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the terms
7// of the GNU General Public License as published by the Free Software
8// Foundation; either version 2, or (at your option) any later
9// version.
10
11// This library is distributed in the hope that it will be useful, but
12// WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14// General Public License for more details.
15
16// You should have received a copy of the GNU General Public License
17// along with this library; see the file COPYING.  If not, write to
18// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19// MA 02111-1307, USA.
20
21// As a special exception, you may use this file as part of a free
22// software library without restriction.  Specifically, if other files
23// instantiate templates or use macros or inline functions from this
24// file, or you compile this file and link it with other files to
25// produce an executable, this file does not by itself cause the
26// resulting executable to be covered by the GNU General Public
27// License.  This exception does not however invalidate any other
28// reasons why the executable file might be covered by the GNU General
29// Public License.
30
31// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
32
33// Permission to use, copy, modify, sell, and distribute this software
34// is hereby granted without fee, provided that the above copyright
35// notice appears in all copies, and that both that copyright notice
36// and this permission notice appear in supporting documentation. None
37// of the above authors, nor IBM Haifa Research Laboratories, make any
38// representation about the suitability of this software for any
39// purpose. It is provided "as is" without express or implied
40// warranty.
41
42/**
43 * @file node_metadata_selector.hpp
44 * Contains an implementation class for trees.
45 */
46
47#ifndef PB_DS_TREE_NODE_METADATA_SELECTOR_HPP
48#define PB_DS_TREE_NODE_METADATA_SELECTOR_HPP
49
50#include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>
51#include <ext/pb_ds/detail/types_traits.hpp>
52
53namespace pb_ds
54{
55  namespace detail
56  {
57
58    template<typename Node_Update, bool Null>
59    struct tree_metadata_helper
60    {
61      typedef typename Node_Update::metadata_type type;
62    };
63
64    template<typename Node_Update>
65    struct tree_metadata_helper<
66      Node_Update,
67      true>
68    {
69      typedef null_node_metadata type;
70    };
71
72    template<typename Key,
73	     typename Data,
74	     class Cmp_Fn,
75	     template<typename Const_Node_Iterator,
76		      class Const_Iterator,
77		      class Cmp_Fn_,
78		      class Allocator_>
79    class Node_Update,
80	     class Allocator>
81    struct tree_node_metadata_selector
82    {
83    private:
84      typedef
85      dumconst_node_iterator<
86      Key,
87      Data,
88      Allocator>
89      dumconst_node_it;
90
91      enum
92	{
93	  null_update =
94	  is_same<
95	  Node_Update<
96	  dumconst_node_it,
97	  dumconst_node_it,
98	  Cmp_Fn,
99	  Allocator>,
100	  null_tree_node_update<
101	  dumconst_node_it,
102	  dumconst_node_it,
103	  Cmp_Fn,
104	  Allocator> >::value
105	};
106
107    public:
108      typedef
109      typename tree_metadata_helper<
110      Node_Update<
111      dumconst_node_it,
112      dumconst_node_it,
113      Cmp_Fn,
114      Allocator>,
115      null_update>::type
116      type;
117    };
118
119  } // namespace detail
120} // namespace pb_ds
121
122#endif // #ifndef PB_DS_TREE_NODE_METADATA_SELECTOR_HPP
123