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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 pairing_heap_/erase_fn_imps.hpp |
* Contains an implementation class for a pairing heap. |
*/ |
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PB_DS_CLASS_T_DEC |
void |
PB_DS_CLASS_C_DEC:: |
pop() |
{ |
PB_DS_ASSERT_VALID((*this)) |
_GLIBCXX_DEBUG_ASSERT(!base_type::empty()); |
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node_pointer p_new_root = join_node_children(base_type::m_p_root); |
PB_DS_ASSERT_NODE_CONSISTENT(p_new_root, false) |
if (p_new_root != 0) |
p_new_root->m_p_prev_or_parent = 0; |
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base_type::actual_erase_node(base_type::m_p_root); |
base_type::m_p_root = p_new_root; |
PB_DS_ASSERT_VALID((*this)) |
} |
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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()); |
remove_node(it.m_p_nd); |
base_type::actual_erase_node(it.m_p_nd); |
PB_DS_ASSERT_VALID((*this)) |
} |
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PB_DS_CLASS_T_DEC |
void |
PB_DS_CLASS_C_DEC:: |
remove_node(node_pointer p_nd) |
{ |
PB_DS_ASSERT_VALID((*this)) |
_GLIBCXX_DEBUG_ASSERT(!base_type::empty()); |
node_pointer p_new_child = join_node_children(p_nd); |
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PB_DS_ASSERT_NODE_CONSISTENT(p_new_child, false) |
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if (p_nd == base_type::m_p_root) |
{ |
if (p_new_child != 0) |
p_new_child->m_p_prev_or_parent = 0; |
base_type::m_p_root = p_new_child; |
PB_DS_ASSERT_NODE_CONSISTENT(base_type::m_p_root, false) |
return; |
} |
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_GLIBCXX_DEBUG_ASSERT(p_nd->m_p_prev_or_parent != 0); |
if (p_nd->m_p_prev_or_parent->m_p_l_child == p_nd) |
{ |
if (p_new_child != 0) |
{ |
p_new_child->m_p_prev_or_parent = p_nd->m_p_prev_or_parent; |
p_new_child->m_p_next_sibling = p_nd->m_p_next_sibling; |
if (p_new_child->m_p_next_sibling != 0) |
p_new_child->m_p_next_sibling->m_p_prev_or_parent = p_new_child; |
p_nd->m_p_prev_or_parent->m_p_l_child = p_new_child; |
PB_DS_ASSERT_NODE_CONSISTENT(p_nd->m_p_prev_or_parent, false) |
return; |
} |
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p_nd->m_p_prev_or_parent->m_p_l_child = p_nd->m_p_next_sibling; |
if (p_nd->m_p_next_sibling != 0) |
p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd->m_p_prev_or_parent; |
PB_DS_ASSERT_NODE_CONSISTENT(p_nd->m_p_prev_or_parent, false) |
return; |
} |
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if (p_new_child != 0) |
{ |
p_new_child->m_p_prev_or_parent = p_nd->m_p_prev_or_parent; |
p_new_child->m_p_next_sibling = p_nd->m_p_next_sibling; |
if (p_new_child->m_p_next_sibling != 0) |
p_new_child->m_p_next_sibling->m_p_prev_or_parent = p_new_child; |
p_new_child->m_p_prev_or_parent->m_p_next_sibling = p_new_child; |
PB_DS_ASSERT_NODE_CONSISTENT(p_nd->m_p_prev_or_parent, false) |
return; |
} |
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p_nd->m_p_prev_or_parent->m_p_next_sibling = p_nd->m_p_next_sibling; |
if (p_nd->m_p_next_sibling != 0) |
p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd->m_p_prev_or_parent; |
PB_DS_ASSERT_NODE_CONSISTENT(p_nd->m_p_prev_or_parent, false) |
} |
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PB_DS_CLASS_T_DEC |
typename PB_DS_CLASS_C_DEC::node_pointer |
PB_DS_CLASS_C_DEC:: |
join_node_children(node_pointer p_nd) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_nd != 0); |
node_pointer p_ret = p_nd->m_p_l_child; |
if (p_ret == 0) |
return 0; |
while (p_ret->m_p_next_sibling != 0) |
p_ret = forward_join(p_ret, p_ret->m_p_next_sibling); |
while (p_ret->m_p_prev_or_parent != p_nd) |
p_ret = back_join(p_ret->m_p_prev_or_parent, p_ret); |
PB_DS_ASSERT_NODE_CONSISTENT(p_ret, false) |
return p_ret; |
} |
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PB_DS_CLASS_T_DEC |
typename PB_DS_CLASS_C_DEC::node_pointer |
PB_DS_CLASS_C_DEC:: |
forward_join(node_pointer p_nd, node_pointer p_next) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_nd != 0); |
_GLIBCXX_DEBUG_ASSERT(p_nd->m_p_next_sibling == p_next); |
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; |
base_type::make_child_of(p_nd, p_next); |
return p_next->m_p_next_sibling == 0 |
? p_next : p_next->m_p_next_sibling; |
} |
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if (p_next->m_p_next_sibling != 0) |
{ |
p_next->m_p_next_sibling->m_p_prev_or_parent = p_nd; |
p_nd->m_p_next_sibling = p_next->m_p_next_sibling; |
base_type::make_child_of(p_next, p_nd); |
return p_nd->m_p_next_sibling; |
} |
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p_nd->m_p_next_sibling = 0; |
base_type::make_child_of(p_next, p_nd); |
PB_DS_ASSERT_NODE_CONSISTENT(p_nd, false) |
return p_nd; |
} |
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PB_DS_CLASS_T_DEC |
typename PB_DS_CLASS_C_DEC::node_pointer |
PB_DS_CLASS_C_DEC:: |
back_join(node_pointer p_nd, node_pointer p_next) |
{ |
_GLIBCXX_DEBUG_ASSERT(p_nd != 0); |
_GLIBCXX_DEBUG_ASSERT(p_next->m_p_next_sibling == 0); |
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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; |
base_type::make_child_of(p_nd, p_next); |
PB_DS_ASSERT_NODE_CONSISTENT(p_next, false) |
return p_next; |
} |
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p_nd->m_p_next_sibling = 0; |
base_type::make_child_of(p_next, p_nd); |
PB_DS_ASSERT_NODE_CONSISTENT(p_nd, false) |
return p_nd; |
} |
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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; |
} |
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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; |
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push_imp(p_cur); |
p_cur = p_next; |
} |
PB_DS_ASSERT_VALID((*this)) |
return ersd; |
} |
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