pairing_heap_/split_join_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 pairing_heap_/split_join_fn_imps.hpp
* Contains an implementation class for a pairing heap.
*/
PB_DS_CLASS_T_DEC
template<typename Pred>
void
PB_DS_CLASS_C_DEC::
split(Pred pred, PB_DS_CLASS_C_DEC& other)
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
other.clear();
if (base_type::empty())
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
return;
}
base_type::to_linked_list();
node_pointer p_out = base_type::prune(pred);
while (p_out != 0)
{
_GLIBCXX_DEBUG_ASSERT(base_type::m_size > 0);
--base_type::m_size;
++other.m_size;
node_pointer p_next = p_out->m_p_next_sibling;
p_out->m_p_l_child = p_out->m_p_next_sibling = p_out->m_p_prev_or_parent = 0;
other.push_imp(p_out);
p_out = p_next;
}
PB_DS_ASSERT_VALID(other)
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_next_sibling = p_cur->m_p_prev_or_parent = 0;
push_imp(p_cur);
p_cur = p_next;
}
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
join(PB_DS_CLASS_C_DEC& other)
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
if (other.m_p_root == 0)
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
return;
}
if (base_type::m_p_root == 0)
base_type::m_p_root = other.m_p_root;
else if (Cmp_Fn::operator()(base_type::m_p_root->m_value, other.m_p_root->m_value))
{
base_type::make_child_of(base_type::m_p_root, other.m_p_root);
PB_DS_ASSERT_NODE_CONSISTENT(other.m_p_root, false)
base_type::m_p_root = other.m_p_root;
}
else
{
base_type::make_child_of(other.m_p_root, base_type::m_p_root);
PB_DS_ASSERT_NODE_CONSISTENT(base_type::m_p_root, false)
}
base_type::m_size += other.m_size;
other.m_p_root = 0;
other.m_size = 0;
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
}