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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2016 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 PB_DS_CLASS_T_DEC
  42 bool
  43 PB_DS_CLASS_C_DEC::
  44 join_prep(PB_DS_CLASS_C_DEC& other)
  45 {
  46   PB_DS_ASSERT_VALID((*this))
  47   PB_DS_ASSERT_VALID(other)
  48   if (other.m_size == 0)
  49     return false;
  50
  51   if (m_size == 0)
  52     {
  53       value_swap(other);
  54       return false;
  55     }
  56
  57   const bool greater =
  58     Cmp_Fn::operator()(PB_DS_V2F(m_p_head->m_p_right->m_value),
  59                        PB_DS_V2F(other.m_p_head->m_p_left->m_value));
  60
  61   const bool lesser =
  62     Cmp_Fn::operator()(PB_DS_V2F(other.m_p_head->m_p_right->m_value),
  63                        PB_DS_V2F(m_p_head->m_p_left->m_value));
  64
  65   if (!greater && !lesser)
  66     __throw_join_error();
  67
  68   if (lesser)
  69     value_swap(other);
  70
  71   m_size += other.m_size;
  72   _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)
  73   return true;
  74 }
  75
  76 PB_DS_CLASS_T_DEC
  77 void
  78 PB_DS_CLASS_C_DEC::
  79 join_finish(PB_DS_CLASS_C_DEC& other)
  80 {
  81   initialize_min_max();
  82   other.initialize();
  83 }
  84
  85 PB_DS_CLASS_T_DEC
  86 bool
  87 PB_DS_CLASS_C_DEC::
  88 split_prep(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
  89 {
  90   PB_DS_ASSERT_VALID((*this))
  91   PB_DS_ASSERT_VALID(other)
  92   other.clear();
  93
  94   if (m_size == 0)
  95     {
  96       PB_DS_ASSERT_VALID((*this))
  97       PB_DS_ASSERT_VALID(other)
  98       return false;
  99     }
 100
 101   if (Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_left->m_value)))
 102     {
 103       value_swap(other);
 104       PB_DS_ASSERT_VALID((*this))
 105       PB_DS_ASSERT_VALID(other)
 106       return false;
 107     }
 108
 109   if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(m_p_head->m_p_right->m_value)))
 110     {
 111       PB_DS_ASSERT_VALID((*this))
 112       PB_DS_ASSERT_VALID(other)
 113       return false;
 114     }
 115
 116   if (m_size == 1)
 117     {
 118       value_swap(other);
 119       PB_DS_ASSERT_VALID((*this))
 120       PB_DS_ASSERT_VALID(other)
 121       return false;
 122     }
 123
 124   _GLIBCXX_DEBUG_ONLY(debug_base::split(r_key,(Cmp_Fn& )(*this), other);)
 125   return true;
 126 }
 127
 128 PB_DS_CLASS_T_DEC
 129 void
 130 PB_DS_CLASS_C_DEC::
 131 split_finish(PB_DS_CLASS_C_DEC& other)
 132 {
 133   other.initialize_min_max();
 134   other.m_size = std::distance(other.begin(), other.end());
 135   m_size -= other.m_size;
 136   initialize_min_max();
 137   PB_DS_ASSERT_VALID((*this))
 138   PB_DS_ASSERT_VALID(other)
 139 }
 140
 141 PB_DS_CLASS_T_DEC
 142 typename PB_DS_CLASS_C_DEC::size_type
 143 PB_DS_CLASS_C_DEC::
 144 recursive_count(node_pointer p) const
 145 {
 146   if (p == 0)
 147     return 0;
 148   return 1 + recursive_count(p->m_p_left) + recursive_count(p->m_p_right);
 149 }
 150