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// -*- C++ -*- |
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// Copyright (C) 2005-2015 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. |
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// 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. |
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// 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. |
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// 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/>. |
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. |
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// 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. |
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/** |
* @file splay_tree_/splay_fn_imps.hpp |
* Contains an implementation class for splay_tree_. |
*/ |
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PB_DS_CLASS_T_DEC |
void |
PB_DS_CLASS_C_DEC:: |
splay(node_pointer p_nd) |
{ |
while (p_nd->m_p_parent != base_type::m_p_head) |
{ |
#ifdef _GLIBCXX_DEBUG |
{ |
node_pointer p_head = base_type::m_p_head; |
assert_special_imp(p_head, __FILE__, __LINE__); |
} |
#endif |
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PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) |
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if (p_nd->m_p_parent->m_p_parent == base_type::m_p_head) |
{ |
base_type::rotate_parent(p_nd); |
_GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent); |
} |
else |
{ |
const node_pointer p_parent = p_nd->m_p_parent; |
const node_pointer p_grandparent = p_parent->m_p_parent; |
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#ifdef _GLIBCXX_DEBUG |
const size_type total = |
base_type::recursive_count(p_grandparent); |
_GLIBCXX_DEBUG_ASSERT(total >= 3); |
#endif |
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if (p_parent->m_p_left == p_nd && |
p_grandparent->m_p_right == p_parent) |
splay_zig_zag_left(p_nd, p_parent, p_grandparent); |
else if (p_parent->m_p_right == p_nd && |
p_grandparent->m_p_left == p_parent) |
splay_zig_zag_right(p_nd, p_parent, p_grandparent); |
else if (p_parent->m_p_left == p_nd && |
p_grandparent->m_p_left == p_parent) |
splay_zig_zig_left(p_nd, p_parent, p_grandparent); |
else |
splay_zig_zig_right(p_nd, p_parent, p_grandparent); |
_GLIBCXX_DEBUG_ASSERT(total ==this->recursive_count(p_nd)); |
} |
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PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) |
} |
} |
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PB_DS_CLASS_T_DEC |
inline void |
PB_DS_CLASS_C_DEC:: |
splay_zig_zag_left(node_pointer p_nd, node_pointer p_parent, |
node_pointer p_grandparent) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); |
_GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); |
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PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) |
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_GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd && |
p_grandparent->m_p_right == p_parent); |
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splay_zz_start(p_nd, p_parent, p_grandparent); |
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node_pointer p_b = p_nd->m_p_right; |
node_pointer p_c = p_nd->m_p_left; |
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p_nd->m_p_right = p_parent; |
p_parent->m_p_parent = p_nd; |
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p_nd->m_p_left = p_grandparent; |
p_grandparent->m_p_parent = p_nd; |
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p_parent->m_p_left = p_b; |
if (p_b != 0) |
p_b->m_p_parent = p_parent; |
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p_grandparent->m_p_right = p_c; |
if (p_c != 0) |
p_c->m_p_parent = p_grandparent; |
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splay_zz_end(p_nd, p_parent, p_grandparent); |
} |
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PB_DS_CLASS_T_DEC |
inline void |
PB_DS_CLASS_C_DEC:: |
splay_zig_zag_right(node_pointer p_nd, node_pointer p_parent, |
node_pointer p_grandparent) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); |
_GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); |
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PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) |
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_GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd && |
p_grandparent->m_p_left == p_parent); |
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splay_zz_start(p_nd, p_parent, p_grandparent); |
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node_pointer p_b = p_nd->m_p_left; |
node_pointer p_c = p_nd->m_p_right; |
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p_nd->m_p_left = p_parent; |
p_parent->m_p_parent = p_nd; |
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p_nd->m_p_right = p_grandparent; |
p_grandparent->m_p_parent = p_nd; |
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p_parent->m_p_right = p_b; |
if (p_b != 0) |
p_b->m_p_parent = p_parent; |
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p_grandparent->m_p_left = p_c; |
if (p_c != 0) |
p_c->m_p_parent = p_grandparent; |
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splay_zz_end(p_nd, p_parent, p_grandparent); |
} |
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PB_DS_CLASS_T_DEC |
inline void |
PB_DS_CLASS_C_DEC:: |
splay_zig_zig_left(node_pointer p_nd, node_pointer p_parent, |
node_pointer p_grandparent) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); |
_GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); |
|
PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) |
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_GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd && |
p_nd->m_p_parent->m_p_parent->m_p_left == p_nd->m_p_parent); |
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splay_zz_start(p_nd, p_parent, p_grandparent); |
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node_pointer p_b = p_nd->m_p_right; |
node_pointer p_c = p_parent->m_p_right; |
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p_nd->m_p_right = p_parent; |
p_parent->m_p_parent = p_nd; |
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p_parent->m_p_right = p_grandparent; |
p_grandparent->m_p_parent = p_parent; |
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p_parent->m_p_left = p_b; |
if (p_b != 0) |
p_b->m_p_parent = p_parent; |
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p_grandparent->m_p_left = p_c; |
if (p_c != 0) |
p_c->m_p_parent = p_grandparent; |
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splay_zz_end(p_nd, p_parent, p_grandparent); |
} |
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PB_DS_CLASS_T_DEC |
inline void |
PB_DS_CLASS_C_DEC:: |
splay_zig_zig_right(node_pointer p_nd, node_pointer p_parent, |
node_pointer p_grandparent) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); |
_GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); |
PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) |
_GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd && |
p_nd->m_p_parent->m_p_parent->m_p_right == p_nd->m_p_parent); |
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splay_zz_start(p_nd, p_parent, p_grandparent); |
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node_pointer p_b = p_nd->m_p_left; |
node_pointer p_c = p_parent->m_p_left; |
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p_nd->m_p_left = p_parent; |
p_parent->m_p_parent = p_nd; |
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p_parent->m_p_left = p_grandparent; |
p_grandparent->m_p_parent = p_parent; |
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p_parent->m_p_right = p_b; |
if (p_b != 0) |
p_b->m_p_parent = p_parent; |
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p_grandparent->m_p_right = p_c; |
if (p_c != 0) |
p_c->m_p_parent = p_grandparent; |
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base_type::update_to_top(p_grandparent, (node_update*)this); |
splay_zz_end(p_nd, p_parent, p_grandparent); |
} |
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PB_DS_CLASS_T_DEC |
inline void |
PB_DS_CLASS_C_DEC:: |
splay_zz_start(node_pointer p_nd, |
#ifdef _GLIBCXX_DEBUG |
node_pointer p_parent, |
#else |
node_pointer /*p_parent*/, |
#endif |
node_pointer p_grandparent) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_nd != 0); |
_GLIBCXX_DEBUG_ASSERT(p_parent != 0); |
_GLIBCXX_DEBUG_ASSERT(p_grandparent != 0); |
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const bool grandparent_head = p_grandparent->m_p_parent == base_type::m_p_head; |
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if (grandparent_head) |
{ |
base_type::m_p_head->m_p_parent = base_type::m_p_head->m_p_parent; |
p_nd->m_p_parent = base_type::m_p_head; |
return; |
} |
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node_pointer p_greatgrandparent = p_grandparent->m_p_parent; |
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p_nd->m_p_parent = p_greatgrandparent; |
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if (p_grandparent == p_greatgrandparent->m_p_left) |
p_greatgrandparent->m_p_left = p_nd; |
else |
p_greatgrandparent->m_p_right = p_nd; |
} |
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PB_DS_CLASS_T_DEC |
inline void |
PB_DS_CLASS_C_DEC:: |
splay_zz_end(node_pointer p_nd, node_pointer p_parent, |
node_pointer p_grandparent) |
{ |
if (p_nd->m_p_parent == base_type::m_p_head) |
base_type::m_p_head->m_p_parent = p_nd; |
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this->apply_update(p_grandparent, (node_update*)this); |
this->apply_update(p_parent, (node_update*)this); |
this->apply_update(p_nd, (node_update*)this); |
PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) |
} |