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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2015 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.  
  113.