libstdc++
rb_tree_map_/node.hpp
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00001 // -*- C++ -*-
00002 
00003 // Copyright (C) 2005, 2006, 2009, 2011 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the terms
00007 // of the GNU General Public License as published by the Free Software
00008 // Foundation; either version 3, or (at your option) any later
00009 // version.
00010 
00011 // This library is distributed in the hope that it will be useful, but
00012 // WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014 // General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
00026 
00027 // Permission to use, copy, modify, sell, and distribute this software
00028 // is hereby granted without fee, provided that the above copyright
00029 // notice appears in all copies, and that both that copyright notice
00030 // and this permission notice appear in supporting documentation. None
00031 // of the above authors, nor IBM Haifa Research Laboratories, make any
00032 // representation about the suitability of this software for any
00033 // purpose. It is provided "as is" without express or implied
00034 // warranty.
00035 
00036 /**
00037  * @file rb_tree_map_/node.hpp
00038  * Contains an implementation for rb_tree_.
00039  */
00040 
00041 #ifndef PB_DS_RB_TREE_NODE_HPP
00042 #define PB_DS_RB_TREE_NODE_HPP
00043 
00044 #include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>
00045 
00046 namespace __gnu_pbds
00047 {
00048   namespace detail
00049   {
00050     /// Node for Red-Black trees.
00051     template<typename Value_Type, class Metadata, typename _Alloc>
00052     struct rb_tree_node_
00053     {
00054     public:
00055       typedef Value_Type        value_type;
00056       typedef Metadata          metadata_type;
00057 
00058       typedef
00059       typename _Alloc::template rebind<
00060       rb_tree_node_<
00061       Value_Type,
00062       Metadata,
00063       _Alloc> >::other::pointer
00064       node_pointer;
00065 
00066       typedef
00067       typename _Alloc::template rebind<
00068     metadata_type>::other::reference
00069       metadata_reference;
00070 
00071       typedef
00072       typename _Alloc::template rebind<
00073     metadata_type>::other::const_reference
00074       metadata_const_reference;
00075 
00076       bool
00077       special() const
00078       { return m_red; }
00079 
00080       metadata_const_reference
00081       get_metadata() const
00082       { return m_metadata; }
00083 
00084       metadata_reference
00085       get_metadata()
00086       { return m_metadata; }
00087 
00088 #ifdef PB_DS_BIN_SEARCH_TREE_TRACE_
00089       void
00090       trace() const
00091       {
00092     std::cout << PB_DS_V2F(m_value) <<(m_red? " <r> " : " <b> ") 
00093           << "(" << m_metadata << ")";
00094       }
00095 #endif
00096 
00097       node_pointer  m_p_left;
00098       node_pointer  m_p_right;
00099       node_pointer  m_p_parent;
00100       value_type    m_value;
00101       bool      m_red;
00102       metadata_type     m_metadata;
00103     };
00104 
00105     template<typename Value_Type, typename _Alloc>
00106     struct rb_tree_node_<Value_Type, null_type, _Alloc>
00107     {
00108     public:
00109       typedef Value_Type        value_type;
00110       typedef null_type     metadata_type;
00111 
00112       typedef
00113       typename _Alloc::template rebind<
00114       rb_tree_node_<
00115       Value_Type,
00116       null_type,
00117       _Alloc> >::other::pointer
00118       node_pointer;
00119 
00120       bool
00121       special() const
00122       { return m_red; }
00123 
00124 #ifdef PB_DS_BIN_SEARCH_TREE_TRACE_
00125       void
00126       trace() const
00127       { std::cout << PB_DS_V2F(m_value) <<(m_red? " <r> " : " <b> "); }
00128 #endif 
00129 
00130       node_pointer  m_p_left;
00131       node_pointer  m_p_right;
00132       node_pointer  m_p_parent;
00133       value_type    m_value;
00134       bool      m_red;
00135     };
00136   } // namespace detail
00137 } // namespace __gnu_pbds
00138 
00139 #endif