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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2020 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 #ifdef PB_DS_CLASS_C_DEC
  42
  43 PB_DS_CLASS_T_DEC
  44 inline void
  45 PB_DS_CLASS_C_DEC::
  46 join(PB_DS_CLASS_C_DEC& other)
  47 {
  48   PB_DS_ASSERT_VALID((*this))
  49   PB_DS_ASSERT_VALID(other)
  50   if (base_type::join_prep(other) == false)
  51     {
  52       PB_DS_ASSERT_VALID((*this))
  53       PB_DS_ASSERT_VALID(other)
  54       return;
  55     }
  56
  57   node_pointer p_target_r = other.leftmost(other.m_p_head);
  58   _GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
  59   other.splay(p_target_r);
  60
  61   _GLIBCXX_DEBUG_ASSERT(p_target_r == other.m_p_head->m_p_parent);
  62   _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left == 0);
  63
  64   p_target_r->m_p_left = base_type::m_p_head->m_p_parent;
  65
  66   _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left != 0);
  67   p_target_r->m_p_left->m_p_parent = p_target_r;
  68
  69   base_type::m_p_head->m_p_parent = p_target_r;
  70   p_target_r->m_p_parent = base_type::m_p_head;
  71
  72   this->apply_update(p_target_r, (node_update*)this);
  73   base_type::join_finish(other);
  74
  75   PB_DS_ASSERT_VALID((*this))
  76   PB_DS_ASSERT_VALID(other)
  77 }
  78
  79 PB_DS_CLASS_T_DEC
  80 void
  81 PB_DS_CLASS_C_DEC::
  82 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
  83 {
  84   PB_DS_ASSERT_VALID((*this))
  85   PB_DS_ASSERT_VALID(other)
  86
  87   if (base_type::split_prep(r_key, other) == false)
  88     {
  89       PB_DS_ASSERT_VALID((*this))
  90       PB_DS_ASSERT_VALID(other)
  91       return;
  92     }
  93
  94   node_pointer p_upper_bound = this->upper_bound(r_key).m_p_nd;
  95   _GLIBCXX_DEBUG_ASSERT(p_upper_bound != 0);
  96
  97   splay(p_upper_bound);
  98   _GLIBCXX_DEBUG_ASSERT(p_upper_bound->m_p_parent == this->m_p_head);
  99
 100   node_pointer p_new_root = p_upper_bound->m_p_left;
 101   _GLIBCXX_DEBUG_ASSERT(p_new_root != 0);
 102
 103   base_type::m_p_head->m_p_parent = p_new_root;
 104   p_new_root->m_p_parent = base_type::m_p_head;
 105   other.m_p_head->m_p_parent = p_upper_bound;
 106   p_upper_bound->m_p_parent = other.m_p_head;
 107   p_upper_bound->m_p_left = 0;
 108   this->apply_update(p_upper_bound, (node_update*)this);
 109   base_type::split_finish(other);
 110
 111   PB_DS_ASSERT_VALID((*this))
 112   PB_DS_ASSERT_VALID(other)
 113 }
 114
 115 #endif