binomial_heap_base_/erase_fn_imps.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, or (at your option) any later
// version.
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.
/**
* @file binomial_heap_base_/erase_fn_imps.hpp
* Contains an implementation class for a base of binomial heaps.
*/
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
pop()
{
PB_DS_ASSERT_VALID_COND((*this),true)
_GLIBCXX_DEBUG_ASSERT(!base_type::empty());
if (m_p_max == 0)
find_max();
_GLIBCXX_DEBUG_ASSERT(m_p_max != 0);
node_pointer p_nd = m_p_max;
remove_parentless_node(m_p_max);
base_type::actual_erase_node(p_nd);
m_p_max = 0;
PB_DS_ASSERT_VALID_COND((*this),true)
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
remove_parentless_node(node_pointer p_nd)
{
_GLIBCXX_DEBUG_ASSERT(p_nd != 0);
_GLIBCXX_DEBUG_ASSERT(base_type::parent(p_nd) == 0);
node_pointer p_cur_root = p_nd == base_type::m_p_root?
p_nd->m_p_next_sibling : base_type::m_p_root;
if (p_cur_root != 0)
p_cur_root->m_p_prev_or_parent = 0;
if (p_nd->m_p_prev_or_parent != 0)
p_nd->m_p_prev_or_parent->m_p_next_sibling = p_nd->m_p_next_sibling;
if (p_nd->m_p_next_sibling != 0)
p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;
node_pointer p_child = p_nd->m_p_l_child;
if (p_child != 0)
{
p_child->m_p_prev_or_parent = 0;
while (p_child->m_p_next_sibling != 0)
p_child = p_child->m_p_next_sibling;
}
m_p_max = 0;
base_type::m_p_root = join(p_cur_root, p_child);
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
clear()
{
base_type::clear();
m_p_max = 0;
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
erase(point_iterator it)
{
PB_DS_ASSERT_VALID_COND((*this),true)
_GLIBCXX_DEBUG_ASSERT(!base_type::empty());
base_type::bubble_to_top(it.m_p_nd);
remove_parentless_node(it.m_p_nd);
base_type::actual_erase_node(it.m_p_nd);
m_p_max = 0;
PB_DS_ASSERT_VALID_COND((*this),true)
}
PB_DS_CLASS_T_DEC
template<typename Pred>
typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
erase_if(Pred pred)
{
PB_DS_ASSERT_VALID_COND((*this),true)
if (base_type::empty())
{
PB_DS_ASSERT_VALID_COND((*this),true)
return 0;
}
base_type::to_linked_list();
node_pointer p_out = base_type::prune(pred);
size_type ersd = 0;
while (p_out != 0)
{
++ersd;
node_pointer p_next = p_out->m_p_next_sibling;
base_type::actual_erase_node(p_out);
p_out = p_next;
}
node_pointer p_cur = base_type::m_p_root;
base_type::m_p_root = 0;
while (p_cur != 0)
{
node_pointer p_next = p_cur->m_p_next_sibling;
p_cur->m_p_l_child = p_cur->m_p_prev_or_parent = 0;
p_cur->m_metadata = 0;
p_cur->m_p_next_sibling = base_type::m_p_root;
if (base_type::m_p_root != 0)
base_type::m_p_root->m_p_prev_or_parent = p_cur;
base_type::m_p_root = p_cur;
base_type::m_p_root = fix(base_type::m_p_root);
p_cur = p_next;
}
m_p_max = 0;
PB_DS_ASSERT_VALID_COND((*this),true)
return ersd;
}