binomial_heap_base_/insert_fn_imps.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2014 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_/insert_fn_imps.hpp
* Contains an implementation class for a base of binomial heaps.
*/
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::point_iterator
PB_DS_CLASS_C_DEC::
push(const_reference r_val)
{
PB_DS_ASSERT_VALID_COND((*this),true)
node_pointer p_nd = base_type::get_new_node_for_insert(r_val);
insert_node(p_nd);
m_p_max = 0;
PB_DS_ASSERT_VALID_COND((*this),true)
return point_iterator(p_nd);
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
insert_node(node_pointer p_nd)
{
if (base_type::m_p_root == 0)
{
p_nd->m_p_next_sibling = 0;
p_nd->m_p_prev_or_parent = 0;
p_nd->m_p_l_child = 0;
p_nd->m_metadata = 0;
base_type::m_p_root = p_nd;
return;
}
if (base_type::m_p_root->m_metadata > 0)
{
p_nd->m_p_prev_or_parent = p_nd->m_p_l_child = 0;
p_nd->m_p_next_sibling = base_type::m_p_root;
base_type::m_p_root->m_p_prev_or_parent = p_nd;
base_type::m_p_root = p_nd;
p_nd->m_metadata = 0;
return;
}
if (Cmp_Fn::operator()(base_type::m_p_root->m_value, p_nd->m_value))
{
p_nd->m_p_next_sibling = base_type::m_p_root->m_p_next_sibling;
p_nd->m_p_prev_or_parent = 0;
p_nd->m_metadata = 1;
p_nd->m_p_l_child = base_type::m_p_root;
base_type::m_p_root->m_p_prev_or_parent = p_nd;
base_type::m_p_root->m_p_next_sibling = 0;
base_type::m_p_root = p_nd;
}
else
{
p_nd->m_p_next_sibling = 0;
p_nd->m_p_l_child = 0;
p_nd->m_p_prev_or_parent = base_type::m_p_root;
p_nd->m_metadata = 0;
_GLIBCXX_DEBUG_ASSERT(base_type::m_p_root->m_p_l_child == 0);
base_type::m_p_root->m_p_l_child = p_nd;
base_type::m_p_root->m_metadata = 1;
}
base_type::m_p_root = fix(base_type::m_p_root);
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
fix(node_pointer p_nd) const
{
while (p_nd->m_p_next_sibling != 0 &&
p_nd->m_metadata == p_nd->m_p_next_sibling->m_metadata)
{
node_pointer p_next = p_nd->m_p_next_sibling;
if (Cmp_Fn::operator()(p_nd->m_value, p_next->m_value))
{
p_next->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;
if (p_nd->m_p_prev_or_parent != 0)
p_nd->m_p_prev_or_parent->m_p_next_sibling = p_next;
base_type::make_child_of(p_nd, p_next);
++p_next->m_metadata;
p_nd = p_next;
}
else
{
p_nd->m_p_next_sibling = p_next->m_p_next_sibling;
if (p_nd->m_p_next_sibling != 0)
p_next->m_p_next_sibling = 0;
base_type::make_child_of(p_next, p_nd);
++p_nd->m_metadata;
}
}
if (p_nd->m_p_next_sibling != 0)
p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd;
return p_nd;
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
modify(point_iterator it, const_reference r_new_val)
{
PB_DS_ASSERT_VALID_COND((*this),true)
node_pointer p_nd = it.m_p_nd;
_GLIBCXX_DEBUG_ASSERT(p_nd != 0);
PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd, false)
const bool bubble_up = Cmp_Fn::operator()(p_nd->m_value, r_new_val);
p_nd->m_value = r_new_val;
if (bubble_up)
{
node_pointer p_parent = base_type::parent(p_nd);
while (p_parent != 0 &&
Cmp_Fn::operator()(p_parent->m_value, p_nd->m_value))
{
base_type::swap_with_parent(p_nd, p_parent);
p_parent = base_type::parent(p_nd);
}
if (p_nd->m_p_prev_or_parent == 0)
base_type::m_p_root = p_nd;
m_p_max = 0;
PB_DS_ASSERT_VALID_COND((*this),true)
return;
}
base_type::bubble_to_top(p_nd);
remove_parentless_node(p_nd);
insert_node(p_nd);
m_p_max = 0;
PB_DS_ASSERT_VALID_COND((*this),true)
}