// -*- C++ -*-
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// Copyright (C) 2005-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 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
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <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
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file splay_tree_/erase_fn_imps.hpp
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* Contains an implementation class for splay_tree_.
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*/
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#ifdef PB_DS_CLASS_C_DEC
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PB_DS_CLASS_T_DEC
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inline bool
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PB_DS_CLASS_C_DEC::
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erase(key_const_reference r_key)
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{
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point_iterator it = find(r_key);
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if (it == base_type::end())
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return false;
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erase(it);
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return true;
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}
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::iterator
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PB_DS_CLASS_C_DEC::
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erase(iterator it)
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{
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PB_DS_ASSERT_VALID((*this))
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if (it == base_type::end())
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return it;
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iterator ret_it = it;
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++ret_it;
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erase_node(it.m_p_nd);
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PB_DS_ASSERT_VALID((*this))
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return ret_it;
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}
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::reverse_iterator
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PB_DS_CLASS_C_DEC::
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erase(reverse_iterator it)
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{
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PB_DS_ASSERT_VALID((*this))
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if (it.m_p_nd == base_type::m_p_head)
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return (it);
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reverse_iterator ret_it = it;
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++ret_it;
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erase_node(it.m_p_nd);
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PB_DS_ASSERT_VALID((*this))
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return ret_it;
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}
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PB_DS_CLASS_T_DEC
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template<typename Pred>
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inline typename PB_DS_CLASS_C_DEC::size_type
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PB_DS_CLASS_C_DEC::
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erase_if(Pred pred)
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{
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PB_DS_ASSERT_VALID((*this))
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size_type num_ersd = 0;
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iterator it = base_type::begin();
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while (it != base_type::end())
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{
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if (pred(*it))
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{
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++num_ersd;
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it = erase(it);
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}
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else
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++it;
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}
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PB_DS_ASSERT_VALID((*this))
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return num_ersd;
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}
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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erase_node(node_pointer p_nd)
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{
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_GLIBCXX_DEBUG_ASSERT(p_nd != 0);
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splay(p_nd);
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PB_DS_ASSERT_VALID((*this))
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_GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent);
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node_pointer p_l = p_nd->m_p_left;
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node_pointer p_r = p_nd->m_p_right;
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base_type::update_min_max_for_erased_node(p_nd);
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base_type::actual_erase_node(p_nd);
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if (p_r == 0)
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{
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base_type::m_p_head->m_p_parent = p_l;
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if (p_l != 0)
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p_l->m_p_parent = base_type::m_p_head;
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PB_DS_ASSERT_VALID((*this))
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return;
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}
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node_pointer p_target_r = leftmost(p_r);
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_GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
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p_r->m_p_parent = base_type::m_p_head;
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base_type::m_p_head->m_p_parent = p_r;
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splay(p_target_r);
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_GLIBCXX_DEBUG_ONLY(p_target_r->m_p_left = 0);
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_GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_parent == this->m_p_head);
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_GLIBCXX_DEBUG_ASSERT(this->m_p_head->m_p_parent == p_target_r);
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p_target_r->m_p_left = p_l;
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if (p_l != 0)
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p_l->m_p_parent = p_target_r;
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PB_DS_ASSERT_VALID((*this))
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this->apply_update(p_target_r, (node_update*)this);
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}
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::node_pointer
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PB_DS_CLASS_C_DEC::
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leftmost(node_pointer p_nd)
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{
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_GLIBCXX_DEBUG_ASSERT(p_nd != 0);
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while (p_nd->m_p_left != 0)
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p_nd = p_nd->m_p_left;
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return p_nd;
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}
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#endif
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