left_child_next_sibling_heap_/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 left_child_next_sibling_heap_/erase_fn_imps.hpp
* Contains an implementation class for left_child_next_sibling_heap_.
*/
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
clear()
{
clear_imp(m_p_root);
_GLIBCXX_DEBUG_ASSERT(m_size == 0);
m_p_root = 0;
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
actual_erase_node(node_pointer p_nd)
{
_GLIBCXX_DEBUG_ASSERT(m_size > 0);
--m_size;
p_nd->~node();
s_node_allocator.deallocate(p_nd, 1);
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
clear_imp(node_pointer p_nd)
{
while (p_nd != 0)
{
clear_imp(p_nd->m_p_l_child);
node_pointer p_next = p_nd->m_p_next_sibling;
actual_erase_node(p_nd);
p_nd = p_next;
}
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
to_linked_list()
{
PB_DS_ASSERT_VALID((*this))
node_pointer p_cur = m_p_root;
while (p_cur != 0)
if (p_cur->m_p_l_child != 0)
{
node_pointer p_child_next = p_cur->m_p_l_child->m_p_next_sibling;
p_cur->m_p_l_child->m_p_next_sibling = p_cur->m_p_next_sibling;
p_cur->m_p_next_sibling = p_cur->m_p_l_child;
p_cur->m_p_l_child = p_child_next;
}
else
p_cur = p_cur->m_p_next_sibling;
#ifdef _GLIBCXX_DEBUG
node_const_pointer p_counter = m_p_root;
size_type count = 0;
while (p_counter != 0)
{
++count;
_GLIBCXX_DEBUG_ASSERT(p_counter->m_p_l_child == 0);
p_counter = p_counter->m_p_next_sibling;
}
_GLIBCXX_DEBUG_ASSERT(count == m_size);
#endif
}
PB_DS_CLASS_T_DEC
template<typename Pred>
typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
prune(Pred pred)
{
node_pointer p_cur = m_p_root;
m_p_root = 0;
node_pointer p_out = 0;
while (p_cur != 0)
{
node_pointer p_next = p_cur->m_p_next_sibling;
if (pred(p_cur->m_value))
{
p_cur->m_p_next_sibling = p_out;
if (p_out != 0)
p_out->m_p_prev_or_parent = p_cur;
p_out = p_cur;
}
else
{
p_cur->m_p_next_sibling = m_p_root;
if (m_p_root != 0)
m_p_root->m_p_prev_or_parent = p_cur;
m_p_root = p_cur;
}
p_cur = p_next;
}
return p_out;
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
bubble_to_top(node_pointer p_nd)
{
node_pointer p_parent = parent(p_nd);
while (p_parent != 0)
{
swap_with_parent(p_nd, p_parent);
p_parent = parent(p_nd);
}
}