rb_tree_map_/split_join_fn_imps.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2021 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 rb_tree_map_/split_join_fn_imps.hpp
* Contains an implementation for rb_tree_.
*/
#ifdef PB_DS_CLASS_C_DEC
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 (base_type::join_prep(other) == false)
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
return;
}
const node_pointer p_x = other.split_min();
join_imp(p_x, other.m_p_head->m_p_parent);
base_type::join_finish(other);
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
join_imp(node_pointer p_x, node_pointer p_r)
{
_GLIBCXX_DEBUG_ASSERT(p_x != 0);
if (p_r != 0)
p_r->m_red = false;
const size_type h = black_height(base_type::m_p_head->m_p_parent);
const size_type other_h = black_height(p_r);
node_pointer p_x_l;
node_pointer p_x_r;
std::pair<node_pointer, node_pointer> join_pos;
const bool right_join = h >= other_h;
if (right_join)
{
join_pos = find_join_pos_right(base_type::m_p_head->m_p_parent,
h, other_h);
p_x_l = join_pos.first;
p_x_r = p_r;
}
else
{
p_x_l = base_type::m_p_head->m_p_parent;
base_type::m_p_head->m_p_parent = p_r;
if (p_r != 0)
p_r->m_p_parent = base_type::m_p_head;
join_pos = find_join_pos_left(base_type::m_p_head->m_p_parent,
h, other_h);
p_x_r = join_pos.first;
}
node_pointer p_parent = join_pos.second;
if (p_parent == base_type::m_p_head)
{
base_type::m_p_head->m_p_parent = p_x;
p_x->m_p_parent = base_type::m_p_head;
}
else
{
p_x->m_p_parent = p_parent;
if (right_join)
p_x->m_p_parent->m_p_right = p_x;
else
p_x->m_p_parent->m_p_left = p_x;
}
p_x->m_p_left = p_x_l;
if (p_x_l != 0)
p_x_l->m_p_parent = p_x;
p_x->m_p_right = p_x_r;
if (p_x_r != 0)
p_x_r->m_p_parent = p_x;
p_x->m_red = true;
base_type::initialize_min_max();
PB_DS_STRUCT_ONLY_ASSERT_VALID((*this))
base_type::update_to_top(p_x, (node_update* )this);
insert_fixup(p_x);
PB_DS_STRUCT_ONLY_ASSERT_VALID((*this))
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
split_min()
{
node_pointer p_min = base_type::m_p_head->m_p_left;
#ifdef _GLIBCXX_DEBUG
const node_pointer p_head = base_type::m_p_head;
_GLIBCXX_DEBUG_ASSERT(p_min != p_head);
#endif
remove_node(p_min);
return p_min;
}
PB_DS_CLASS_T_DEC
std::pair<
typename PB_DS_CLASS_C_DEC::node_pointer,
typename PB_DS_CLASS_C_DEC::node_pointer>
PB_DS_CLASS_C_DEC::
find_join_pos_right(node_pointer p_l, size_type h_l, size_type h_r)
{
_GLIBCXX_DEBUG_ASSERT(h_l >= h_r);
if (base_type::m_p_head->m_p_parent == 0)
return (std::make_pair((node_pointer)0, base_type::m_p_head));
node_pointer p_l_parent = base_type::m_p_head;
while (h_l > h_r)
{
if (p_l->m_red == false)
{
_GLIBCXX_DEBUG_ASSERT(h_l > 0);
--h_l;
}
p_l_parent = p_l;
p_l = p_l->m_p_right;
}
if (!is_effectively_black(p_l))
{
p_l_parent = p_l;
p_l = p_l->m_p_right;
}
_GLIBCXX_DEBUG_ASSERT(is_effectively_black(p_l));
_GLIBCXX_DEBUG_ASSERT(black_height(p_l) == h_r);
_GLIBCXX_DEBUG_ASSERT(p_l == 0 || p_l->m_p_parent == p_l_parent);
return std::make_pair(p_l, p_l_parent);
}
PB_DS_CLASS_T_DEC
std::pair<
typename PB_DS_CLASS_C_DEC::node_pointer,
typename PB_DS_CLASS_C_DEC::node_pointer>
PB_DS_CLASS_C_DEC::
find_join_pos_left(node_pointer p_r, size_type h_l, size_type h_r)
{
_GLIBCXX_DEBUG_ASSERT(h_r > h_l);
if (base_type::m_p_head->m_p_parent == 0)
return (std::make_pair((node_pointer)0,
base_type::m_p_head));
node_pointer p_r_parent = base_type::m_p_head;
while (h_r > h_l)
{
if (p_r->m_red == false)
{
_GLIBCXX_DEBUG_ASSERT(h_r > 0);
--h_r;
}
p_r_parent = p_r;
p_r = p_r->m_p_left;
}
if (!is_effectively_black(p_r))
{
p_r_parent = p_r;
p_r = p_r->m_p_left;
}
_GLIBCXX_DEBUG_ASSERT(is_effectively_black(p_r));
_GLIBCXX_DEBUG_ASSERT(black_height(p_r) == h_l);
_GLIBCXX_DEBUG_ASSERT(p_r == 0 || p_r->m_p_parent == p_r_parent);
return std::make_pair(p_r, p_r_parent);
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
black_height(node_pointer p_nd)
{
size_type h = 1;
while (p_nd != 0)
{
if (p_nd->m_red == false)
++h;
p_nd = p_nd->m_p_left;
}
return h;
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
if (base_type::split_prep(r_key, other) == false)
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
return;
}
PB_DS_STRUCT_ONLY_ASSERT_VALID((*this))
PB_DS_STRUCT_ONLY_ASSERT_VALID(other)
node_pointer p_nd = this->upper_bound(r_key).m_p_nd;
do
{
node_pointer p_next_nd = p_nd->m_p_parent;
if (Cmp_Fn::operator()(r_key, PB_DS_V2F(p_nd->m_value)))
split_at_node(p_nd, other);
PB_DS_STRUCT_ONLY_ASSERT_VALID((*this))
PB_DS_STRUCT_ONLY_ASSERT_VALID(other)
p_nd = p_next_nd;
}
while (p_nd != base_type::m_p_head);
base_type::split_finish(other);
PB_DS_ASSERT_VALID((*this))
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
split_at_node(node_pointer p_nd, PB_DS_CLASS_C_DEC& other)
{
_GLIBCXX_DEBUG_ASSERT(p_nd != 0);
node_pointer p_l = p_nd->m_p_left;
node_pointer p_r = p_nd->m_p_right;
node_pointer p_parent = p_nd->m_p_parent;
if (p_parent == base_type::m_p_head)
{
base_type::m_p_head->m_p_parent = p_l;
if (p_l != 0)
{
p_l->m_p_parent = base_type::m_p_head;
p_l->m_red = false;
}
}
else
{
if (p_parent->m_p_left == p_nd)
p_parent->m_p_left = p_l;
else
p_parent->m_p_right = p_l;
if (p_l != 0)
p_l->m_p_parent = p_parent;
this->update_to_top(p_parent, (node_update* )this);
if (!p_nd->m_red)
remove_fixup(p_l, p_parent);
}
base_type::initialize_min_max();
other.join_imp(p_nd, p_r);
PB_DS_STRUCT_ONLY_ASSERT_VALID((*this))
PB_DS_STRUCT_ONLY_ASSERT_VALID(other)
}
#endif
std::make_pair
constexpr pair< typename __decay_and_strip< _T1 >::__type, typename __decay_and_strip< _T2 >::__type > make_pair(_T1 &&__x, _T2 &&__y)
A convenience wrapper for creating a pair from two objects.
Definition stl_pair.h:567
std::pair
Struct holding two objects of arbitrary type.
Definition stl_pair.h:213
std::pair::first
_T1 first
The first member.
Definition stl_pair.h:217
std::pair::second
_T2 second
The second member.
Definition stl_pair.h:218