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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2009, 2010 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 split_join_fn_imps.hpp
  38  * Contains an implementation class for a pairing heap.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 template<typename Pred>
  43 void
  44 PB_DS_CLASS_C_DEC::
  45 split(Pred pred, PB_DS_CLASS_C_DEC& other)
  46 {
  47   _GLIBCXX_DEBUG_ONLY(assert_valid();)
  48     _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  49
  50     other.clear();
  51
  52   if (base_type::empty())
  53     {
  54       _GLIBCXX_DEBUG_ONLY(assert_valid();)
  55         _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  56
  57         return;
  58     }
  59
  60   base_type::to_linked_list();
  61
  62   node_pointer p_out = base_type::prune(pred);
  63
  64   while (p_out != 0)
  65     {
  66       _GLIBCXX_DEBUG_ASSERT(base_type::m_size > 0);
  67       --base_type::m_size;
  68
  69       ++other.m_size;
  70
  71       node_pointer p_next = p_out->m_p_next_sibling;
  72
  73       p_out->m_p_l_child = p_out->m_p_next_sibling = p_out->m_p_prev_or_parent = 0;
  74
  75       other.push_imp(p_out);
  76
  77       p_out = p_next;
  78     }
  79
  80   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  81
  82     node_pointer p_cur = base_type::m_p_root;
  83
  84   base_type::m_p_root = 0;
  85
  86   while (p_cur != 0)
  87     {
  88       node_pointer p_next = p_cur->m_p_next_sibling;
  89
  90       p_cur->m_p_l_child = p_cur->m_p_next_sibling = p_cur->m_p_prev_or_parent = 0;
  91
  92       push_imp(p_cur);
  93
  94       p_cur = p_next;
  95     }
  96
  97   _GLIBCXX_DEBUG_ONLY(assert_valid();)
  98     _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  99     }
 100
 101 PB_DS_CLASS_T_DEC
 102 inline void
 103 PB_DS_CLASS_C_DEC::
 104 join(PB_DS_CLASS_C_DEC& other)
 105 {
 106   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 107     _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
 108
 109     if (other.m_p_root == 0)
 110       {
 111         _GLIBCXX_DEBUG_ONLY(assert_valid();)
 112           _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
 113
 114           return;
 115       }
 116
 117   if (base_type::m_p_root == 0)
 118     base_type::m_p_root = other.m_p_root;
 119   else if (Cmp_Fn::operator()(base_type::m_p_root->m_value, other.m_p_root->m_value))
 120     {
 121       base_type::make_child_of(base_type::m_p_root, other.m_p_root);
 122       _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(other.m_p_root, false));
 123
 124       base_type::m_p_root = other.m_p_root;
 125     }
 126   else
 127     {
 128       base_type::make_child_of(other.m_p_root, base_type::m_p_root);
 129       _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(base_type::m_p_root, false));
 130     }
 131
 132   base_type::m_size += other.m_size;
 133
 134   other.m_p_root = 0;
 135   other.m_size = 0;
 136
 137   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 138     _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
 139     }
 140