pat_trie_/erase_fn_imps.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2017 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 pat_trie_/erase_fn_imps.hpp
* Contains an implementation class for pat_trie.
*/
PB_DS_CLASS_T_DEC
inline bool
PB_DS_CLASS_C_DEC::
erase(key_const_reference r_key)
{
node_pointer p_nd = find_imp(r_key);
if (p_nd == 0 || p_nd->m_type == i_node)
{
PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
return false;
}
_GLIBCXX_DEBUG_ASSERT(p_nd->m_type == leaf_node);
if (!synth_access_traits::equal_keys(PB_DS_V2F(reinterpret_cast<leaf_pointer>(p_nd)->value()), r_key))
{
PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
return false;
}
PB_DS_CHECK_KEY_EXISTS(r_key)
erase_leaf(static_cast<leaf_pointer>(p_nd));
PB_DS_ASSERT_VALID((*this))
return true;
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
erase_fixup(inode_pointer p_nd)
{
_GLIBCXX_DEBUG_ASSERT(std::distance(p_nd->begin(), p_nd->end()) >= 1);
if (std::distance(p_nd->begin(), p_nd->end()) == 1)
{
node_pointer p_parent = p_nd->m_p_parent;
if (p_parent == m_p_head)
m_p_head->m_p_parent = *p_nd->begin();
else
{
_GLIBCXX_DEBUG_ASSERT(p_parent->m_type == i_node);
node_pointer p_new_child = *p_nd->begin();
typedef inode_pointer inode_ptr;
inode_ptr p_internal = static_cast<inode_ptr>(p_parent);
p_internal->replace_child(p_new_child, pref_begin(p_new_child),
pref_end(p_new_child), this);
}
(*p_nd->begin())->m_p_parent = p_nd->m_p_parent;
p_nd->~inode();
s_inode_allocator.deallocate(p_nd, 1);
if (p_parent == m_p_head)
return;
_GLIBCXX_DEBUG_ASSERT(p_parent->m_type == i_node);
p_nd = static_cast<inode_pointer>(p_parent);
}
while (true)
{
_GLIBCXX_DEBUG_ASSERT(std::distance(p_nd->begin(), p_nd->end()) > 1);
p_nd->update_prefixes(this);
apply_update(p_nd, (node_update*)this);
PB_DS_ASSERT_NODE_VALID(p_nd)
if (p_nd->m_p_parent->m_type == head_node)
return;
_GLIBCXX_DEBUG_ASSERT(p_nd->m_p_parent->m_type == i_node);
p_nd = static_cast<inode_pointer>(p_nd->m_p_parent);
}
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
actual_erase_leaf(leaf_pointer p_l)
{
_GLIBCXX_DEBUG_ASSERT(m_size > 0);
--m_size;
_GLIBCXX_DEBUG_ONLY(debug_base::erase_existing(PB_DS_V2F(p_l->value())));
p_l->~leaf();
s_leaf_allocator.deallocate(p_l, 1);
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
clear()
{
if (!empty())
{
clear_imp(m_p_head->m_p_parent);
m_size = 0;
initialize();
_GLIBCXX_DEBUG_ONLY(debug_base::clear();)
PB_DS_ASSERT_VALID((*this))
}
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
clear_imp(node_pointer p_nd)
{
if (p_nd->m_type == i_node)
{
_GLIBCXX_DEBUG_ASSERT(p_nd->m_type == i_node);
for (typename inode::iterator it =
static_cast<inode_pointer>(p_nd)->begin();
it != static_cast<inode_pointer>(p_nd)->end();
++it)
{
node_pointer p_child =* it;
clear_imp(p_child);
}
s_inode_allocator.deallocate(static_cast<inode_pointer>(p_nd), 1);
return;
}
_GLIBCXX_DEBUG_ASSERT(p_nd->m_type == leaf_node);
static_cast<leaf_pointer>(p_nd)->~leaf();
s_leaf_allocator.deallocate(static_cast<leaf_pointer>(p_nd), 1);
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::const_iterator
PB_DS_CLASS_C_DEC::
erase(const_iterator it)
{
PB_DS_ASSERT_VALID((*this))
if (it == end())
return it;
const_iterator ret_it = it;
++ret_it;
_GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);
erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));
PB_DS_ASSERT_VALID((*this))
return ret_it;
}
#ifdef PB_DS_DATA_TRUE_INDICATOR
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::iterator
PB_DS_CLASS_C_DEC::
erase(iterator it)
{
PB_DS_ASSERT_VALID((*this))
if (it == end())
return it;
iterator ret_it = it;
++ret_it;
_GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);
erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));
PB_DS_ASSERT_VALID((*this))
return ret_it;
}
#endif // #ifdef PB_DS_DATA_TRUE_INDICATOR
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::const_reverse_iterator
PB_DS_CLASS_C_DEC::
erase(const_reverse_iterator it)
{
PB_DS_ASSERT_VALID((*this))
if (it.m_p_nd == m_p_head)
return it;
const_reverse_iterator ret_it = it;
++ret_it;
_GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);
erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));
PB_DS_ASSERT_VALID((*this))
return ret_it;
}
#ifdef PB_DS_DATA_TRUE_INDICATOR
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::reverse_iterator
PB_DS_CLASS_C_DEC::
erase(reverse_iterator it)
{
PB_DS_ASSERT_VALID((*this))
if (it.m_p_nd == m_p_head)
return it;
reverse_iterator ret_it = it;
++ret_it;
_GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);
erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));
PB_DS_ASSERT_VALID((*this))
return ret_it;
}
#endif // #ifdef PB_DS_DATA_TRUE_INDICATOR
PB_DS_CLASS_T_DEC
template<typename Pred>
inline typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
erase_if(Pred pred)
{
size_type num_ersd = 0;
PB_DS_ASSERT_VALID((*this))
iterator it = begin();
while (it != end())
{
PB_DS_ASSERT_VALID((*this))
if (pred(*it))
{
++num_ersd;
it = erase(it);
}
else
++it;
}
PB_DS_ASSERT_VALID((*this))
return num_ersd;
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
erase_leaf(leaf_pointer p_l)
{
update_min_max_for_erased_leaf(p_l);
if (p_l->m_p_parent->m_type == head_node)
{
_GLIBCXX_DEBUG_ASSERT(size() == 1);
clear();
return;
}
_GLIBCXX_DEBUG_ASSERT(size() > 1);
_GLIBCXX_DEBUG_ASSERT(p_l->m_p_parent->m_type == i_node);
inode_pointer p_parent = static_cast<inode_pointer>(p_l->m_p_parent);
p_parent->remove_child(p_l);
erase_fixup(p_parent);
actual_erase_leaf(p_l);
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
update_min_max_for_erased_leaf(leaf_pointer p_l)
{
if (m_size == 1)
{
m_p_head->m_p_min = m_p_head;
m_p_head->m_p_max = m_p_head;
return;
}
if (p_l == static_cast<leaf_const_pointer>(m_p_head->m_p_min))
{
iterator it(p_l);
++it;
m_p_head->m_p_min = it.m_p_nd;
return;
}
if (p_l == static_cast<leaf_const_pointer>(m_p_head->m_p_max))
{
iterator it(p_l);
--it;
m_p_head->m_p_max = it.m_p_nd;
}
}
std::begin
constexpr const _Tp * begin(initializer_list< _Tp > __ils) noexcept
Return an iterator pointing to the first element of the initializer_list.
Definition: initializer_list:89
std::distance
_GLIBCXX17_CONSTEXPR iterator_traits< _InputIterator >::difference_type distance(_InputIterator __first, _InputIterator __last)
A generalization of pointer arithmetic.
Definition: stl_iterator_base_funcs.h:138
std::end
constexpr const _Tp * end(initializer_list< _Tp > __ils) noexcept
Return an iterator pointing to one past the last element of the initializer_list.
Definition: initializer_list:99