thin_heap_/erase_fn_imps.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2013 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 thin_heap_/erase_fn_imps.hpp
* Contains an implementation for thin_heap_.
*/
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
pop()
{
PB_DS_ASSERT_VALID((*this))
_GLIBCXX_DEBUG_ASSERT(!base_type::empty());
_GLIBCXX_DEBUG_ASSERT(m_p_max != 0);
node_pointer p_nd = m_p_max;
remove_max_node();
base_type::actual_erase_node(p_nd);
PB_DS_ASSERT_VALID((*this))
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
remove_max_node()
{
to_aux_except_max();
make_from_aux();
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
to_aux_except_max()
{
node_pointer p_add = base_type::m_p_root;
while (p_add != m_p_max)
{
node_pointer p_next_add = p_add->m_p_next_sibling;
add_to_aux(p_add);
p_add = p_next_add;
}
p_add = m_p_max->m_p_l_child;
while (p_add != 0)
{
node_pointer p_next_add = p_add->m_p_next_sibling;
p_add->m_metadata = p_add->m_p_l_child == 0 ?
0 : p_add->m_p_l_child->m_metadata + 1;
add_to_aux(p_add);
p_add = p_next_add;
}
p_add = m_p_max->m_p_next_sibling;
while (p_add != 0)
{
node_pointer p_next_add = p_add->m_p_next_sibling;
add_to_aux(p_add);
p_add = p_next_add;
}
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
add_to_aux(node_pointer p_nd)
{
size_type r = p_nd->m_metadata;
while (m_a_aux[r] != 0)
{
_GLIBCXX_DEBUG_ASSERT(p_nd->m_metadata < rank_bound());
if (Cmp_Fn::operator()(m_a_aux[r]->m_value, p_nd->m_value))
make_child_of(m_a_aux[r], p_nd);
else
{
make_child_of(p_nd, m_a_aux[r]);
p_nd = m_a_aux[r];
}
m_a_aux[r] = 0;
++r;
}
_GLIBCXX_DEBUG_ASSERT(p_nd->m_metadata < rank_bound());
m_a_aux[r] = p_nd;
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
make_child_of(node_pointer p_nd, node_pointer p_new_parent)
{
_GLIBCXX_DEBUG_ASSERT(p_nd->m_metadata == p_new_parent->m_metadata);
_GLIBCXX_DEBUG_ASSERT(m_a_aux[p_nd->m_metadata] == p_nd ||
m_a_aux[p_nd->m_metadata] == p_new_parent);
++p_new_parent->m_metadata;
base_type::make_child_of(p_nd, p_new_parent);
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
make_from_aux()
{
base_type::m_p_root = m_p_max = 0;
const size_type rnk_bnd = rank_bound();
size_type i = 0;
while (i < rnk_bnd)
{
if (m_a_aux[i] != 0)
{
make_root_and_link(m_a_aux[i]);
m_a_aux[i] = 0;
}
++i;
}
PB_DS_ASSERT_AUX_NULL((*this))
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
remove_node(node_pointer p_nd)
{
node_pointer p_parent = p_nd;
while (base_type::parent(p_parent) != 0)
p_parent = base_type::parent(p_parent);
base_type::bubble_to_top(p_nd);
m_p_max = p_nd;
node_pointer p_fix = base_type::m_p_root;
while (p_fix != 0&& p_fix->m_p_next_sibling != p_parent)
p_fix = p_fix->m_p_next_sibling;
if (p_fix != 0)
p_fix->m_p_next_sibling = p_nd;
remove_max_node();
}
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((*this))
_GLIBCXX_DEBUG_ASSERT(!base_type::empty());
node_pointer p_nd = it.m_p_nd;
remove_node(p_nd);
base_type::actual_erase_node(p_nd);
PB_DS_ASSERT_VALID((*this))
}
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((*this))
if (base_type::empty())
{
PB_DS_ASSERT_VALID((*this))
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;
m_p_max = base_type::m_p_root = 0;
while (p_cur != 0)
{
node_pointer p_next = p_cur->m_p_next_sibling;
make_root_and_link(p_cur);
p_cur = p_next;
}
PB_DS_ASSERT_VALID((*this))
return ersd;
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
rank_bound()
{
using namespace std;
const size_t* const p_upper =
std::upper_bound(g_a_rank_bounds,
g_a_rank_bounds + num_distinct_rank_bounds,
base_type::m_size);
if (p_upper == g_a_rank_bounds + num_distinct_rank_bounds)
return max_rank;
return (p_upper - g_a_rank_bounds);
}