libstdc++-v3/include/ext/pb_ds/detail/bin_search_tree_/split_join_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2019 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 bin_search_tree_/split_join_fn_imps.hpp
  38  * Contains an implementation class for bin_search_tree_.
  39  */
  40
  41 #ifdef PB_DS_CLASS_C_DEC
  42
  43 PB_DS_CLASS_T_DEC
  44 bool
  45 PB_DS_CLASS_C_DEC::
  46 join_prep(PB_DS_CLASS_C_DEC& other)
  47 {
  48   PB_DS_ASSERT_VALID((*this))
  49   PB_DS_ASSERT_VALID(other)
  50   if (other.m_size == 0)
  51     return false;
  52
  53   if (m_size == 0)
  54     {
  55       value_swap(other);
  56       return false;
  57     }
  58
  59   const bool greater =
  60     Cmp_Fn::operator()(PB_DS_V2F(m_p_head->m_p_right->m_value),
  61                        PB_DS_V2F(other.m_p_head->m_p_left->m_value));
  62
  63   const bool lesser =
  64     Cmp_Fn::operator()(PB_DS_V2F(other.m_p_head->m_p_right->m_value),
  65                        PB_DS_V2F(m_p_head->m_p_left->m_value));
  66
  67   if (!greater && !lesser)
  68     __throw_join_error();
  69
  70   if (lesser)
  71     value_swap(other);
  72
  73   m_size += other.m_size;
  74   _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)
  75   return true;
  76 }
  77
  78 PB_DS_CLASS_T_DEC
  79 void
  80 PB_DS_CLASS_C_DEC::
  81 join_finish(PB_DS_CLASS_C_DEC& other)
  82 {
  83   initialize_min_max();
  84   other.initialize();
  85 }
  86
  87 PB_DS_CLASS_T_DEC
  88 bool
  89 PB_DS_CLASS_C_DEC::
  90 split_prep(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
  91 {
  92   PB_DS_ASSERT_VALID((*this))
  93   PB_DS_ASSERT_VALID(other)
  94   other.clear();
  95
  96   if (m_size == 0)
  97     {
  98       PB_DS_ASSERT_VALID((*this))
  99       PB_DS_ASSERT_VALID(other)
 100       return false;
 101     }
 102
 103   if (Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_left->m_value)))
 104     {
 105       value_swap(other);
 106       PB_DS_ASSERT_VALID((*this))
 107       PB_DS_ASSERT_VALID(other)
 108       return false;
 109     }
 110
 111   if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_right->m_value)))
 112     {
 113       PB_DS_ASSERT_VALID((*this))
 114       PB_DS_ASSERT_VALID(other)
 115       return false;
 116     }
 117
 118   if (m_size == 1)
 119     {
 120       value_swap(other);
 121       PB_DS_ASSERT_VALID((*this))
 122       PB_DS_ASSERT_VALID(other)
 123       return false;
 124     }
 125
 126   _GLIBCXX_DEBUG_ONLY(debug_base::split(r_key,(Cmp_Fn& )(*this), other);)
 127   return true;
 128 }
 129
 130 PB_DS_CLASS_T_DEC
 131 void
 132 PB_DS_CLASS_C_DEC::
 133 split_finish(PB_DS_CLASS_C_DEC& other)
 134 {
 135   other.initialize_min_max();
 136   other.m_size = std::distance(other.begin(), other.end());
 137   m_size -= other.m_size;
 138   initialize_min_max();
 139   PB_DS_ASSERT_VALID((*this))
 140   PB_DS_ASSERT_VALID(other)
 141 }
 142
 143 PB_DS_CLASS_T_DEC
 144 typename PB_DS_CLASS_C_DEC::size_type
 145 PB_DS_CLASS_C_DEC::
 146 recursive_count(node_pointer p) const
 147 {
 148   if (p == 0)
 149     return 0;
 150   return 1 + recursive_count(p->m_p_left) + recursive_count(p->m_p_right);
 151 }
 152
 153 #endif