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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2018 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 splay_tree_/split_join_fn_imps.hpp
  38  * Contains an implementation class for splay_tree_.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 inline void
  43 PB_DS_CLASS_C_DEC::
  44 join(PB_DS_CLASS_C_DEC& other)
  45 {
  46   PB_DS_ASSERT_VALID((*this))
  47   PB_DS_ASSERT_VALID(other)
  48   if (base_type::join_prep(other) == false)
  49     {
  50       PB_DS_ASSERT_VALID((*this))
  51       PB_DS_ASSERT_VALID(other)
  52       return;
  53     }
  54
  55   node_pointer p_target_r = other.leftmost(other.m_p_head);
  56   _GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
  57   other.splay(p_target_r);
  58
  59   _GLIBCXX_DEBUG_ASSERT(p_target_r == other.m_p_head->m_p_parent);
  60   _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left == 0);
  61
  62   p_target_r->m_p_left = base_type::m_p_head->m_p_parent;
  63
  64   _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left != 0);
  65   p_target_r->m_p_left->m_p_parent = p_target_r;
  66
  67   base_type::m_p_head->m_p_parent = p_target_r;
  68   p_target_r->m_p_parent = base_type::m_p_head;
  69
  70   this->apply_update(p_target_r, (node_update*)this);
  71   base_type::join_finish(other);
  72
  73   PB_DS_ASSERT_VALID((*this))
  74   PB_DS_ASSERT_VALID(other)
  75 }
  76
  77 PB_DS_CLASS_T_DEC
  78 void
  79 PB_DS_CLASS_C_DEC::
  80 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
  81 {
  82   PB_DS_ASSERT_VALID((*this))
  83   PB_DS_ASSERT_VALID(other)
  84
  85   if (base_type::split_prep(r_key, other) == false)
  86     {
  87       PB_DS_ASSERT_VALID((*this))
  88       PB_DS_ASSERT_VALID(other)
  89       return;
  90     }
  91
  92   node_pointer p_upper_bound = this->upper_bound(r_key).m_p_nd;
  93   _GLIBCXX_DEBUG_ASSERT(p_upper_bound != 0);
  94
  95   splay(p_upper_bound);
  96   _GLIBCXX_DEBUG_ASSERT(p_upper_bound->m_p_parent == this->m_p_head);
  97
  98   node_pointer p_new_root = p_upper_bound->m_p_left;
  99   _GLIBCXX_DEBUG_ASSERT(p_new_root != 0);
 100
 101   base_type::m_p_head->m_p_parent = p_new_root;
 102   p_new_root->m_p_parent = base_type::m_p_head;
 103   other.m_p_head->m_p_parent = p_upper_bound;
 104   p_upper_bound->m_p_parent = other.m_p_head;
 105   p_upper_bound->m_p_left = 0;
 106   this->apply_update(p_upper_bound, (node_update*)this);
 107   base_type::split_finish(other);
 108
 109   PB_DS_ASSERT_VALID((*this))
 110   PB_DS_ASSERT_VALID(other)
 111 }
 112