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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2013 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 rb_tree_map_/node.hpp
  38.  * Contains an implementation for rb_tree_.
  39.  */
  40.  
  41. #ifndef PB_DS_RB_TREE_NODE_HPP
  42. #define PB_DS_RB_TREE_NODE_HPP
  43.  
  44. #include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>
  45.  
  46. namespace __gnu_pbds
  47. {
  48.   namespace detail
  49.   {
  50.     /// Node for Red-Black trees.
  51.     template<typename Value_Type, class Metadata, typename _Alloc>
  52.     struct rb_tree_node_
  53.     {
  54.     public:
  55.       typedef Value_Type                value_type;
  56.       typedef Metadata                  metadata_type;
  57.  
  58.       typedef
  59.       typename _Alloc::template rebind<
  60.       rb_tree_node_<
  61.       Value_Type,
  62.       Metadata,
  63.       _Alloc> >::other::pointer
  64.       node_pointer;
  65.  
  66.       typedef
  67.       typename _Alloc::template rebind<
  68.         metadata_type>::other::reference
  69.       metadata_reference;
  70.  
  71.       typedef
  72.       typename _Alloc::template rebind<
  73.         metadata_type>::other::const_reference
  74.       metadata_const_reference;
  75.  
  76.       bool
  77.       special() const
  78.       { return m_red; }
  79.  
  80.       metadata_const_reference
  81.       get_metadata() const
  82.       { return m_metadata; }
  83.  
  84.       metadata_reference
  85.       get_metadata()
  86.       { return m_metadata; }
  87.  
  88. #ifdef PB_DS_BIN_SEARCH_TREE_TRACE_
  89.       void
  90.       trace() const
  91.       {
  92.         std::cout << PB_DS_V2F(m_value) <<(m_red? " <r> " : " <b> ")
  93.                   << "(" << m_metadata << ")";
  94.       }
  95. #endif
  96.  
  97.       node_pointer      m_p_left;
  98.       node_pointer      m_p_right;
  99.       node_pointer      m_p_parent;
  100.       value_type        m_value;
  101.       bool              m_red;
  102.       metadata_type     m_metadata;
  103.     };
  104.  
  105.     template<typename Value_Type, typename _Alloc>
  106.     struct rb_tree_node_<Value_Type, null_type, _Alloc>
  107.     {
  108.     public:
  109.       typedef Value_Type                value_type;
  110.       typedef null_type         metadata_type;
  111.  
  112.       typedef
  113.       typename _Alloc::template rebind<
  114.       rb_tree_node_<
  115.       Value_Type,
  116.       null_type,
  117.       _Alloc> >::other::pointer
  118.       node_pointer;
  119.  
  120.       bool
  121.       special() const
  122.       { return m_red; }
  123.  
  124. #ifdef PB_DS_BIN_SEARCH_TREE_TRACE_
  125.       void
  126.       trace() const
  127.       { std::cout << PB_DS_V2F(m_value) <<(m_red? " <r> " : " <b> "); }
  128. #endif
  129.  
  130.       node_pointer      m_p_left;
  131.       node_pointer      m_p_right;
  132.       node_pointer      m_p_parent;
  133.       value_type        m_value;
  134.       bool              m_red;
  135.     };
  136.   } // namespace detail
  137. } // namespace __gnu_pbds
  138.  
  139. #endif
  140.