1// -*- C++ -*-
2
3// Copyright (C) 2005-2020 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 3, 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// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23// <http://www.gnu.org/licenses/>.
24
25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
26
27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
29// notice appears in all copies, and that both that copyright notice
30// and this permission notice appear in supporting documentation. None
31// of the above authors, nor IBM Haifa Research Laboratories, make any
32// representation about the suitability of this software for any
33// purpose. It is provided "as is" without express or implied
34// warranty.
35
36/**
37 * @file tree_policy/node_metadata_selector.hpp
38 * Contains an implementation class for trees.
39 */
40
41#ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP
42#define PB_DS_TREE_NODE_METADATA_DISPATCH_HPP
43
44#include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>
45#include <ext/pb_ds/detail/types_traits.hpp>
46
47namespace __gnu_pbds
48{
49  namespace detail
50  {
51    /**
52     *  @addtogroup traits Traits
53     *  @{
54     */
55
56    /// Tree metadata helper.
57    template<typename Node_Update, bool _BTp>
58      struct tree_metadata_helper;
59
60    /// Specialization, false.
61    template<typename Node_Update>
62      struct tree_metadata_helper<Node_Update, false>
63      {
64	typedef typename Node_Update::metadata_type 	type;
65      };
66
67    /// Specialization, true.
68    template<typename Node_Update>
69      struct tree_metadata_helper<Node_Update, true>
70      {
71	typedef null_type 				type;
72      };
73
74    /// Tree node metadata dispatch.
75    template<typename Key,
76	     typename Data,
77	     typename Cmp_Fn,
78	     template<typename Node_CItr,
79		      typename Const_Iterator,
80		      typename Cmp_Fn_,
81		      typename _Alloc_>
82	     class Node_Update,
83	     typename _Alloc>
84    struct tree_node_metadata_dispatch
85    {
86    private:
87      typedef dumnode_const_iterator<Key, Data, _Alloc>		__it_type;
88      typedef Node_Update<__it_type, __it_type, Cmp_Fn, _Alloc>	__node_u;
89      typedef null_node_update<__it_type, __it_type, Cmp_Fn, _Alloc> __nnode_u;
90
91      enum
92	{
93	  null_update = is_same<__node_u, __nnode_u>::value
94	};
95
96    public:
97      typedef typename tree_metadata_helper<__node_u, null_update>::type type;
98    };
99    ///@}
100  } // namespace detail
101} // namespace __gnu_pbds
102
103#endif // #ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP
104