pat_trie_base.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2013 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_/pat_trie_base.hpp
* Contains the base class for a patricia tree.
*/
#ifndef PB_DS_PAT_TRIE_BASE
#define PB_DS_PAT_TRIE_BASE
#include <debug/debug.h>
namespace __gnu_pbds
{
namespace detail
{
/// Base type for PATRICIA trees.
struct pat_trie_base
{
/**
* @brief Three types of nodes.
*
* i_node is used by _Inode, leaf_node by _Leaf, and head_node by _Head.
*/
enum node_type
{
i_node,
leaf_node,
head_node
};
/// Metadata base primary template.
template<typename Metadata, typename _Alloc>
struct _Metadata
{
typedef Metadata metadata_type;
typedef _Alloc allocator_type;
typedef typename _Alloc::template rebind<Metadata> __rebind_m;
typedef typename __rebind_m::other::const_reference const_reference;
const_reference
get_metadata() const
{ return m_metadata; }
metadata_type m_metadata;
};
/// Specialization for null metadata.
template<typename _Alloc>
struct _Metadata<null_type, _Alloc>
{
typedef null_type metadata_type;
typedef _Alloc allocator_type;
};
/// Node base.
template<typename _ATraits, typename Metadata>
struct _Node_base
: public Metadata
{
private:
typedef typename Metadata::allocator_type _Alloc;
public:
typedef _Alloc allocator_type;
typedef _ATraits access_traits;
typedef typename _ATraits::type_traits type_traits;
typedef typename _Alloc::template rebind<_Node_base> __rebind_n;
typedef typename __rebind_n::other::pointer node_pointer;
node_pointer m_p_parent;
const node_type m_type;
_Node_base(node_type type) : m_type(type)
{ }
typedef typename _Alloc::template rebind<_ATraits> __rebind_at;
typedef typename __rebind_at::other::const_pointer a_const_pointer;
typedef typename _ATraits::const_iterator a_const_iterator;
#ifdef _GLIBCXX_DEBUG
typedef std::pair<a_const_iterator, a_const_iterator> node_debug_info;
void
assert_valid(a_const_pointer p_traits,
const char* __file, int __line) const
{ assert_valid_imp(p_traits, __file, __line); }
virtual node_debug_info
assert_valid_imp(a_const_pointer, const char*, int) const = 0;
#endif
};
/// Head node for PATRICIA tree.
template<typename _ATraits, typename Metadata>
struct _Head
: public _Node_base<_ATraits, Metadata>
{
typedef _Node_base<_ATraits, Metadata> base_type;
typedef typename base_type::type_traits type_traits;
typedef typename base_type::node_pointer node_pointer;
node_pointer m_p_min;
node_pointer m_p_max;
_Head() : base_type(head_node) { }
#ifdef _GLIBCXX_DEBUG
typedef typename base_type::node_debug_info node_debug_info;
typedef typename base_type::a_const_pointer a_const_pointer;
virtual node_debug_info
assert_valid_imp(a_const_pointer, const char* __file, int __line) const
{
_GLIBCXX_DEBUG_VERIFY_AT(false,
_M_message("Assertion from %1;:%2;")
._M_string(__FILE__)._M_integer(__LINE__),
__file, __line);
return node_debug_info();
}
#endif
};
/// Leaf node for PATRICIA tree.
template<typename _ATraits, typename Metadata>
struct _Leaf
: public _Node_base<_ATraits, Metadata>
{
typedef _Node_base<_ATraits, Metadata> base_type;
typedef typename base_type::type_traits type_traits;
typedef typename type_traits::value_type value_type;
typedef typename type_traits::reference reference;
typedef typename type_traits::const_reference const_reference;
private:
value_type m_value;
_Leaf(const _Leaf&);
public:
_Leaf(const_reference other)
: base_type(leaf_node), m_value(other) { }
reference
value()
{ return m_value; }
const_reference
value() const
{ return m_value; }
#ifdef _GLIBCXX_DEBUG
typedef typename base_type::node_debug_info node_debug_info;
typedef typename base_type::a_const_pointer a_const_pointer;
virtual node_debug_info
assert_valid_imp(a_const_pointer p_traits,
const char* __file, int __line) const
{
PB_DS_DEBUG_VERIFY(base_type::m_type == leaf_node);
node_debug_info ret;
const_reference r_val = value();
return std::make_pair(p_traits->begin(p_traits->extract_key(r_val)),
p_traits->end(p_traits->extract_key(r_val)));
}
virtual
~_Leaf() { }
#endif
};
/// Internal node type, PATRICIA tree.
template<typename _ATraits, typename Metadata>
struct _Inode
: public _Node_base<_ATraits, Metadata>
{
typedef _Node_base<_ATraits, Metadata> base_type;
typedef typename base_type::type_traits type_traits;
typedef typename base_type::access_traits access_traits;
typedef typename type_traits::value_type value_type;
typedef typename base_type::allocator_type _Alloc;
typedef _Alloc allocator_type;
typedef typename _Alloc::size_type size_type;
private:
typedef typename base_type::a_const_pointer a_const_pointer;
typedef typename base_type::a_const_iterator a_const_iterator;
typedef typename base_type::node_pointer node_pointer;
typedef typename _Alloc::template rebind<base_type> __rebind_n;
typedef typename __rebind_n::other::const_pointer node_const_pointer;
typedef _Leaf<_ATraits, Metadata> leaf;
typedef typename _Alloc::template rebind<leaf>::other __rebind_l;
typedef typename __rebind_l::pointer leaf_pointer;
typedef typename __rebind_l::const_pointer leaf_const_pointer;
typedef typename _Alloc::template rebind<_Inode>::other __rebind_in;
typedef typename __rebind_in::pointer inode_pointer;
typedef typename __rebind_in::const_pointer inode_const_pointer;
inline size_type
get_pref_pos(a_const_iterator, a_const_iterator, a_const_pointer) const;
public:
typedef typename _Alloc::template rebind<node_pointer>::other __rebind_np;
typedef typename __rebind_np::pointer node_pointer_pointer;
typedef typename __rebind_np::reference node_pointer_reference;
enum
{
arr_size = _ATraits::max_size + 1
};
PB_DS_STATIC_ASSERT(min_arr_size, arr_size >= 2);
/// Constant child iterator.
struct const_iterator
{
node_pointer_pointer m_p_p_cur;
node_pointer_pointer m_p_p_end;
typedef std::forward_iterator_tag iterator_category;
typedef typename _Alloc::difference_type difference_type;
typedef node_pointer value_type;
typedef node_pointer_pointer pointer;
typedef node_pointer_reference reference;
const_iterator(node_pointer_pointer p_p_cur = 0,
node_pointer_pointer p_p_end = 0)
: m_p_p_cur(p_p_cur), m_p_p_end(p_p_end)
{ }
bool
operator==(const const_iterator& other) const
{ return m_p_p_cur == other.m_p_p_cur; }
bool
operator!=(const const_iterator& other) const
{ return m_p_p_cur != other.m_p_p_cur; }
const_iterator&
operator++()
{
do
++m_p_p_cur;
while (m_p_p_cur != m_p_p_end && *m_p_p_cur == 0);
return *this;
}
const_iterator
operator++(int)
{
const_iterator ret_it(*this);
operator++();
return ret_it;
}
const node_pointer_pointer
operator->() const
{
_GLIBCXX_DEBUG_ONLY(assert_referencible();)
return m_p_p_cur;
}
node_const_pointer
operator*() const
{
_GLIBCXX_DEBUG_ONLY(assert_referencible();)
return *m_p_p_cur;
}
protected:
#ifdef _GLIBCXX_DEBUG
void
assert_referencible() const
{ _GLIBCXX_DEBUG_ASSERT(m_p_p_cur != m_p_p_end && *m_p_p_cur != 0); }
#endif
};
/// Child iterator.
struct iterator : public const_iterator
{
public:
typedef std::forward_iterator_tag iterator_category;
typedef typename _Alloc::difference_type difference_type;
typedef node_pointer value_type;
typedef node_pointer_pointer pointer;
typedef node_pointer_reference reference;
inline
iterator(node_pointer_pointer p_p_cur = 0,
node_pointer_pointer p_p_end = 0)
: const_iterator(p_p_cur, p_p_end) { }
bool
operator==(const iterator& other) const
{ return const_iterator::m_p_p_cur == other.m_p_p_cur; }
bool
operator!=(const iterator& other) const
{ return const_iterator::m_p_p_cur != other.m_p_p_cur; }
iterator&
operator++()
{
const_iterator::operator++();
return *this;
}
iterator
operator++(int)
{
iterator ret_it(*this);
operator++();
return ret_it;
}
node_pointer_pointer
operator->()
{
_GLIBCXX_DEBUG_ONLY(const_iterator::assert_referencible();)
return const_iterator::m_p_p_cur;
}
node_pointer
operator*()
{
_GLIBCXX_DEBUG_ONLY(const_iterator::assert_referencible();)
return *const_iterator::m_p_p_cur;
}
};
_Inode(size_type, const a_const_iterator);
void
update_prefixes(a_const_pointer);
const_iterator
begin() const;
iterator
begin();
const_iterator
end() const;
iterator
end();
inline node_pointer
get_child_node(a_const_iterator, a_const_iterator, a_const_pointer);
inline node_const_pointer
get_child_node(a_const_iterator, a_const_iterator, a_const_pointer) const;
inline iterator
get_child_it(a_const_iterator, a_const_iterator, a_const_pointer);
inline node_pointer
get_lower_bound_child_node(a_const_iterator, a_const_iterator,
size_type, a_const_pointer);
inline node_pointer
add_child(node_pointer, a_const_iterator, a_const_iterator,
a_const_pointer);
inline node_const_pointer
get_join_child(node_const_pointer, a_const_pointer) const;
inline node_pointer
get_join_child(node_pointer, a_const_pointer);
void
remove_child(node_pointer);
void
remove_child(iterator);
void
replace_child(node_pointer, a_const_iterator, a_const_iterator,
a_const_pointer);
inline a_const_iterator
pref_b_it() const;
inline a_const_iterator
pref_e_it() const;
bool
should_be_mine(a_const_iterator, a_const_iterator, size_type,
a_const_pointer) const;
leaf_pointer
leftmost_descendant();
leaf_const_pointer
leftmost_descendant() const;
leaf_pointer
rightmost_descendant();
leaf_const_pointer
rightmost_descendant() const;
#ifdef _GLIBCXX_DEBUG
typedef typename base_type::node_debug_info node_debug_info;
virtual node_debug_info
assert_valid_imp(a_const_pointer, const char*, int) const;
#endif
size_type
get_e_ind() const
{ return m_e_ind; }
private:
_Inode(const _Inode&);
size_type
get_begin_pos() const;
static __rebind_l s_leaf_alloc;
static __rebind_in s_inode_alloc;
const size_type m_e_ind;
a_const_iterator m_pref_b_it;
a_const_iterator m_pref_e_it;
node_pointer m_a_p_children[arr_size];
};
#define PB_DS_CONST_IT_C_DEC \
_CIter<Node, Leaf, Head, Inode, Is_Forward_Iterator>
#define PB_DS_CONST_ODIR_IT_C_DEC \
_CIter<Node, Leaf, Head, Inode, !Is_Forward_Iterator>
#define PB_DS_IT_C_DEC \
_Iter<Node, Leaf, Head, Inode, Is_Forward_Iterator>
#define PB_DS_ODIR_IT_C_DEC \
_Iter<Node, Leaf, Head, Inode, !Is_Forward_Iterator>
/// Const iterator.
template<typename Node, typename Leaf, typename Head, typename Inode,
bool Is_Forward_Iterator>
class _CIter
{
public:
// These types are all the same for the first four template arguments.
typedef typename Node::allocator_type allocator_type;
typedef typename Node::type_traits type_traits;
typedef std::bidirectional_iterator_tag iterator_category;
typedef typename allocator_type::difference_type difference_type;
typedef typename type_traits::value_type value_type;
typedef typename type_traits::pointer pointer;
typedef typename type_traits::reference reference;
typedef typename type_traits::const_pointer const_pointer;
typedef typename type_traits::const_reference const_reference;
typedef allocator_type _Alloc;
typedef typename _Alloc::template rebind<Node> __rebind_n;
typedef typename __rebind_n::other::pointer node_pointer;
typedef typename _Alloc::template rebind<Leaf> __rebind_l;
typedef typename __rebind_l::other::pointer leaf_pointer;
typedef typename __rebind_l::other::const_pointer leaf_const_pointer;
typedef typename _Alloc::template rebind<Head> __rebind_h;
typedef typename __rebind_h::other::pointer head_pointer;
typedef typename _Alloc::template rebind<Inode> __rebind_in;
typedef typename __rebind_in::other::pointer inode_pointer;
typedef typename Inode::iterator inode_iterator;
node_pointer m_p_nd;
_CIter(node_pointer p_nd = 0) : m_p_nd(p_nd)
{ }
_CIter(const PB_DS_CONST_ODIR_IT_C_DEC& other)
: m_p_nd(other.m_p_nd)
{ }
_CIter&
operator=(const _CIter& other)
{
m_p_nd = other.m_p_nd;
return *this;
}
_CIter&
operator=(const PB_DS_CONST_ODIR_IT_C_DEC& other)
{
m_p_nd = other.m_p_nd;
return *this;
}
const_pointer
operator->() const
{
_GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == leaf_node);
return &static_cast<leaf_pointer>(m_p_nd)->value();
}
const_reference
operator*() const
{
_GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == leaf_node);
return static_cast<leaf_pointer>(m_p_nd)->value();
}
bool
operator==(const _CIter& other) const
{ return m_p_nd == other.m_p_nd; }
bool
operator==(const PB_DS_CONST_ODIR_IT_C_DEC& other) const
{ return m_p_nd == other.m_p_nd; }
bool
operator!=(const _CIter& other) const
{ return m_p_nd != other.m_p_nd; }
bool
operator!=(const PB_DS_CONST_ODIR_IT_C_DEC& other) const
{ return m_p_nd != other.m_p_nd; }
_CIter&
operator++()
{
inc(integral_constant<int, Is_Forward_Iterator>());
return *this;
}
_CIter
operator++(int)
{
_CIter ret_it(m_p_nd);
operator++();
return ret_it;
}
_CIter&
operator--()
{
dec(integral_constant<int, Is_Forward_Iterator>());
return *this;
}
_CIter
operator--(int)
{
_CIter ret_it(m_p_nd);
operator--();
return ret_it;
}
protected:
void
inc(false_type)
{ dec(true_type()); }
void
inc(true_type)
{
if (m_p_nd->m_type == head_node)
{
m_p_nd = static_cast<head_pointer>(m_p_nd)->m_p_min;
return;
}
node_pointer p_y = m_p_nd->m_p_parent;
while (p_y->m_type != head_node && get_larger_sibling(m_p_nd) == 0)
{
m_p_nd = p_y;
p_y = p_y->m_p_parent;
}
if (p_y->m_type == head_node)
{
m_p_nd = p_y;
return;
}
m_p_nd = leftmost_descendant(get_larger_sibling(m_p_nd));
}
void
dec(false_type)
{ inc(true_type()); }
void
dec(true_type)
{
if (m_p_nd->m_type == head_node)
{
m_p_nd = static_cast<head_pointer>(m_p_nd)->m_p_max;
return;
}
node_pointer p_y = m_p_nd->m_p_parent;
while (p_y->m_type != head_node && get_smaller_sibling(m_p_nd) == 0)
{
m_p_nd = p_y;
p_y = p_y->m_p_parent;
}
if (p_y->m_type == head_node)
{
m_p_nd = p_y;
return;
}
m_p_nd = rightmost_descendant(get_smaller_sibling(m_p_nd));
}
static node_pointer
get_larger_sibling(node_pointer p_nd)
{
inode_pointer p_parent = static_cast<inode_pointer>(p_nd->m_p_parent);
inode_iterator it = p_parent->begin();
while (*it != p_nd)
++it;
inode_iterator next_it = it;
++next_it;
return (next_it == p_parent->end())? 0 : *next_it;
}
static node_pointer
get_smaller_sibling(node_pointer p_nd)
{
inode_pointer p_parent = static_cast<inode_pointer>(p_nd->m_p_parent);
inode_iterator it = p_parent->begin();
if (*it == p_nd)
return 0;
inode_iterator prev_it;
do
{
prev_it = it;
++it;
if (*it == p_nd)
return *prev_it;
}
while (true);
_GLIBCXX_DEBUG_ASSERT(false);
return 0;
}
static leaf_pointer
leftmost_descendant(node_pointer p_nd)
{
if (p_nd->m_type == leaf_node)
return static_cast<leaf_pointer>(p_nd);
return static_cast<inode_pointer>(p_nd)->leftmost_descendant();
}
static leaf_pointer
rightmost_descendant(node_pointer p_nd)
{
if (p_nd->m_type == leaf_node)
return static_cast<leaf_pointer>(p_nd);
return static_cast<inode_pointer>(p_nd)->rightmost_descendant();
}
};
/// Iterator.
template<typename Node, typename Leaf, typename Head, typename Inode,
bool Is_Forward_Iterator>
class _Iter
: public _CIter<Node, Leaf, Head, Inode, Is_Forward_Iterator>
{
public:
typedef _CIter<Node, Leaf, Head, Inode, Is_Forward_Iterator>
base_type;
typedef typename base_type::allocator_type allocator_type;
typedef typename base_type::type_traits type_traits;
typedef typename type_traits::value_type value_type;
typedef typename type_traits::pointer pointer;
typedef typename type_traits::reference reference;
typedef typename base_type::node_pointer node_pointer;
typedef typename base_type::leaf_pointer leaf_pointer;
typedef typename base_type::leaf_const_pointer leaf_const_pointer;
typedef typename base_type::head_pointer head_pointer;
typedef typename base_type::inode_pointer inode_pointer;
_Iter(node_pointer p_nd = 0)
: base_type(p_nd) { }
_Iter(const PB_DS_ODIR_IT_C_DEC& other)
: base_type(other.m_p_nd) { }
_Iter&
operator=(const _Iter& other)
{
base_type::m_p_nd = other.m_p_nd;
return *this;
}
_Iter&
operator=(const PB_DS_ODIR_IT_C_DEC& other)
{
base_type::m_p_nd = other.m_p_nd;
return *this;
}
pointer
operator->() const
{
_GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd->m_type == leaf_node);
return &static_cast<leaf_pointer>(base_type::m_p_nd)->value();
}
reference
operator*() const
{
_GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd->m_type == leaf_node);
return static_cast<leaf_pointer>(base_type::m_p_nd)->value();
}
_Iter&
operator++()
{
base_type::operator++();
return *this;
}
_Iter
operator++(int)
{
_Iter ret(base_type::m_p_nd);
operator++();
return ret;
}
_Iter&
operator--()
{
base_type::operator--();
return *this;
}
_Iter
operator--(int)
{
_Iter ret(base_type::m_p_nd);
operator--();
return ret;
}
};
#undef PB_DS_CONST_ODIR_IT_C_DEC
#undef PB_DS_ODIR_IT_C_DEC
#define PB_DS_PAT_TRIE_NODE_CONST_ITERATOR_C_DEC \
_Node_citer<Node, Leaf, Head, Inode, _CIterator, Iterator, _ATraits, _Alloc>
#define PB_DS_PAT_TRIE_NODE_ITERATOR_C_DEC \
_Node_iter<Node, Leaf, Head, Inode, _CIterator, Iterator, _ATraits, _Alloc>
/// Node const iterator.
template<typename Node,
typename Leaf,
typename Head,
typename Inode,
typename _CIterator,
typename Iterator,
typename _Alloc>
class _Node_citer
{
protected:
typedef typename _Alloc::template rebind<Node> __rebind_n;
typedef typename __rebind_n::other::pointer node_pointer;
typedef typename _Alloc::template rebind<Leaf> __rebind_l;
typedef typename __rebind_l::other::pointer leaf_pointer;
typedef typename __rebind_l::other::const_pointer leaf_const_pointer;
typedef typename _Alloc::template rebind<Inode> __rebind_in;
typedef typename __rebind_in::other::pointer inode_pointer;
typedef typename __rebind_in::other::const_pointer inode_const_pointer;
typedef typename Node::a_const_pointer a_const_pointer;
typedef typename Node::a_const_iterator a_const_iterator;
private:
a_const_iterator
pref_begin() const
{
if (m_p_nd->m_type == leaf_node)
{
leaf_const_pointer lcp = static_cast<leaf_const_pointer>(m_p_nd);
return m_p_traits->begin(m_p_traits->extract_key(lcp->value()));
}
_GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == i_node);
return static_cast<inode_const_pointer>(m_p_nd)->pref_b_it();
}
a_const_iterator
pref_end() const
{
if (m_p_nd->m_type == leaf_node)
{
leaf_const_pointer lcp = static_cast<leaf_const_pointer>(m_p_nd);
return m_p_traits->end(m_p_traits->extract_key(lcp->value()));
}
_GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == i_node);
return static_cast<inode_const_pointer>(m_p_nd)->pref_e_it();
}
public:
typedef trivial_iterator_tag iterator_category;
typedef trivial_iterator_difference_type difference_type;
typedef typename _Alloc::size_type size_type;
typedef _CIterator value_type;
typedef value_type reference;
typedef value_type const_reference;
/// Metadata type.
typedef typename Node::metadata_type metadata_type;
/// Const metadata reference type.
typedef typename _Alloc::template rebind<metadata_type> __rebind_m;
typedef typename __rebind_m::other __rebind_ma;
typedef typename __rebind_ma::const_reference metadata_const_reference;
inline
_Node_citer(node_pointer p_nd = 0, a_const_pointer p_traits = 0)
: m_p_nd(const_cast<node_pointer>(p_nd)), m_p_traits(p_traits)
{ }
/// Subtree valid prefix.
std::pair<a_const_iterator, a_const_iterator>
valid_prefix() const
{ return std::make_pair(pref_begin(), pref_end()); }
/// Const access; returns the __const iterator* associated with
/// the current leaf.
const_reference
operator*() const
{
_GLIBCXX_DEBUG_ASSERT(num_children() == 0);
return _CIterator(m_p_nd);
}
/// Metadata access.
metadata_const_reference
get_metadata() const
{ return m_p_nd->get_metadata(); }
/// Returns the number of children in the corresponding node.
size_type
num_children() const
{
if (m_p_nd->m_type == leaf_node)
return 0;
_GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == i_node);
inode_pointer inp = static_cast<inode_pointer>(m_p_nd);
return std::distance(inp->begin(), inp->end());
}
/// Returns a __const node __iterator to the corresponding node's
/// i-th child.
_Node_citer
get_child(size_type i) const
{
_GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == i_node);
inode_pointer inp = static_cast<inode_pointer>(m_p_nd);
typename Inode::iterator it = inp->begin();
std::advance(it, i);
return _Node_citer(*it, m_p_traits);
}
/// Compares content to a different iterator object.
bool
operator==(const _Node_citer& other) const
{ return m_p_nd == other.m_p_nd; }
/// Compares content (negatively) to a different iterator object.
bool
operator!=(const _Node_citer& other) const
{ return m_p_nd != other.m_p_nd; }
node_pointer m_p_nd;
a_const_pointer m_p_traits;
};
/// Node iterator.
template<typename Node,
typename Leaf,
typename Head,
typename Inode,
typename _CIterator,
typename Iterator,
typename _Alloc>
class _Node_iter
: public _Node_citer<Node, Leaf, Head, Inode, _CIterator, Iterator, _Alloc>
{
private:
typedef _Node_citer<Node, Leaf, Head, Inode,
_CIterator, Iterator, _Alloc> base_type;
typedef typename _Alloc::template rebind<Node> __rebind_n;
typedef typename __rebind_n::other::pointer node_pointer;
typedef typename base_type::inode_pointer inode_pointer;
typedef typename base_type::a_const_pointer a_const_pointer;
typedef Iterator iterator;
public:
typedef typename base_type::size_type size_type;
typedef Iterator value_type;
typedef value_type reference;
typedef value_type const_reference;
_Node_iter(node_pointer p_nd = 0, a_const_pointer p_traits = 0)
: base_type(p_nd, p_traits)
{ }
/// Access; returns the iterator* associated with the current leaf.
reference
operator*() const
{
_GLIBCXX_DEBUG_ASSERT(base_type::num_children() == 0);
return iterator(base_type::m_p_nd);
}
/// Returns a node __iterator to the corresponding node's i-th child.
_Node_iter
get_child(size_type i) const
{
_GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd->m_type == i_node);
typename Inode::iterator it =
static_cast<inode_pointer>(base_type::m_p_nd)->begin();
std::advance(it, i);
return _Node_iter(*it, base_type::m_p_traits);
}
};
};
#define PB_DS_CLASS_T_DEC \
template<typename _ATraits, typename Metadata>
#define PB_DS_CLASS_C_DEC \
pat_trie_base::_Inode<_ATraits, Metadata>
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::__rebind_l
PB_DS_CLASS_C_DEC::s_leaf_alloc;
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::__rebind_in
PB_DS_CLASS_C_DEC::s_inode_alloc;
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
get_pref_pos(a_const_iterator b_it, a_const_iterator e_it,
a_const_pointer p_traits) const
{
if (static_cast<std::size_t>(std::distance(b_it, e_it)) <= m_e_ind)
return 0;
std::advance(b_it, m_e_ind);
return 1 + p_traits->e_pos(*b_it);
}
PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
_Inode(size_type len, const a_const_iterator it)
: base_type(i_node), m_e_ind(len), m_pref_b_it(it), m_pref_e_it(it)
{
std::advance(m_pref_e_it, m_e_ind);
std::fill(m_a_p_children, m_a_p_children + arr_size,
static_cast<node_pointer>(0));
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
update_prefixes(a_const_pointer p_traits)
{
node_pointer p_first = *begin();
if (p_first->m_type == leaf_node)
{
leaf_const_pointer p = static_cast<leaf_const_pointer>(p_first);
m_pref_b_it = p_traits->begin(access_traits::extract_key(p->value()));
}
else
{
inode_pointer p = static_cast<inode_pointer>(p_first);
_GLIBCXX_DEBUG_ASSERT(p_first->m_type == i_node);
m_pref_b_it = p->pref_b_it();
}
m_pref_e_it = m_pref_b_it;
std::advance(m_pref_e_it, m_e_ind);
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::const_iterator
PB_DS_CLASS_C_DEC::
begin() const
{
typedef node_pointer_pointer pointer_type;
pointer_type p = const_cast<pointer_type>(m_a_p_children);
return const_iterator(p + get_begin_pos(), p + arr_size);
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::iterator
PB_DS_CLASS_C_DEC::
begin()
{
return iterator(m_a_p_children + get_begin_pos(),
m_a_p_children + arr_size);
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::const_iterator
PB_DS_CLASS_C_DEC::
end() const
{
typedef node_pointer_pointer pointer_type;
pointer_type p = const_cast<pointer_type>(m_a_p_children) + arr_size;
return const_iterator(p, p);
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::iterator
PB_DS_CLASS_C_DEC::
end()
{ return iterator(m_a_p_children + arr_size, m_a_p_children + arr_size); }
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
get_child_node(a_const_iterator b_it, a_const_iterator e_it,
a_const_pointer p_traits)
{
const size_type i = get_pref_pos(b_it, e_it, p_traits);
_GLIBCXX_DEBUG_ASSERT(i < arr_size);
return m_a_p_children[i];
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::iterator
PB_DS_CLASS_C_DEC::
get_child_it(a_const_iterator b_it, a_const_iterator e_it,
a_const_pointer p_traits)
{
const size_type i = get_pref_pos(b_it, e_it, p_traits);
_GLIBCXX_DEBUG_ASSERT(i < arr_size);
_GLIBCXX_DEBUG_ASSERT(m_a_p_children[i] != 0);
return iterator(m_a_p_children + i, m_a_p_children + i);
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::node_const_pointer
PB_DS_CLASS_C_DEC::
get_child_node(a_const_iterator b_it, a_const_iterator e_it,
a_const_pointer p_traits) const
{ return const_cast<node_pointer>(get_child_node(b_it, e_it, p_traits)); }
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
get_lower_bound_child_node(a_const_iterator b_it, a_const_iterator e_it,
size_type checked_ind,
a_const_pointer p_traits)
{
if (!should_be_mine(b_it, e_it, checked_ind, p_traits))
{
if (p_traits->cmp_prefixes(b_it, e_it, m_pref_b_it,
m_pref_e_it, true))
return leftmost_descendant();
return rightmost_descendant();
}
size_type i = get_pref_pos(b_it, e_it, p_traits);
_GLIBCXX_DEBUG_ASSERT(i < arr_size);
if (m_a_p_children[i] != 0)
return m_a_p_children[i];
while (++i < arr_size)
if (m_a_p_children[i] != 0)
{
const node_type& __nt = m_a_p_children[i]->m_type;
node_pointer ret = m_a_p_children[i];
if (__nt == leaf_node)
return ret;
_GLIBCXX_DEBUG_ASSERT(__nt == i_node);
inode_pointer inp = static_cast<inode_pointer>(ret);
return inp->leftmost_descendant();
}
return rightmost_descendant();
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
add_child(node_pointer p_nd, a_const_iterator b_it, a_const_iterator e_it,
a_const_pointer p_traits)
{
const size_type i = get_pref_pos(b_it, e_it, p_traits);
_GLIBCXX_DEBUG_ASSERT(i < arr_size);
if (m_a_p_children[i] == 0)
{
m_a_p_children[i] = p_nd;
p_nd->m_p_parent = this;
return p_nd;
}
return m_a_p_children[i];
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::node_const_pointer
PB_DS_CLASS_C_DEC::
get_join_child(node_const_pointer p_nd,
a_const_pointer p_tr) const
{
node_pointer p = const_cast<node_pointer>(p_nd);
return const_cast<inode_pointer>(this)->get_join_child(p, p_tr);
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
get_join_child(node_pointer p_nd, a_const_pointer p_traits)
{
size_type i;
a_const_iterator b_it;
a_const_iterator e_it;
if (p_nd->m_type == leaf_node)
{
leaf_const_pointer p = static_cast<leaf_const_pointer>(p_nd);
typedef typename type_traits::key_const_reference kcr;
kcr r_key = access_traits::extract_key(p->value());
b_it = p_traits->begin(r_key);
e_it = p_traits->end(r_key);
}
else
{
b_it = static_cast<inode_pointer>(p_nd)->pref_b_it();
e_it = static_cast<inode_pointer>(p_nd)->pref_e_it();
}
i = get_pref_pos(b_it, e_it, p_traits);
_GLIBCXX_DEBUG_ASSERT(i < arr_size);
return m_a_p_children[i];
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
remove_child(node_pointer p_nd)
{
size_type i = 0;
for (; i < arr_size; ++i)
if (m_a_p_children[i] == p_nd)
{
m_a_p_children[i] = 0;
return;
}
_GLIBCXX_DEBUG_ASSERT(i != arr_size);
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
remove_child(iterator it)
{ *it.m_p_p_cur = 0; }
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
replace_child(node_pointer p_nd, a_const_iterator b_it,
a_const_iterator e_it,
a_const_pointer p_traits)
{
const size_type i = get_pref_pos(b_it, e_it, p_traits);
_GLIBCXX_DEBUG_ASSERT(i < arr_size);
m_a_p_children[i] = p_nd;
p_nd->m_p_parent = this;
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::a_const_iterator
PB_DS_CLASS_C_DEC::
pref_b_it() const
{ return m_pref_b_it; }
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::a_const_iterator
PB_DS_CLASS_C_DEC::
pref_e_it() const
{ return m_pref_e_it; }
PB_DS_CLASS_T_DEC
bool
PB_DS_CLASS_C_DEC::
should_be_mine(a_const_iterator b_it, a_const_iterator e_it,
size_type checked_ind,
a_const_pointer p_traits) const
{
if (m_e_ind == 0)
return true;
const size_type num_es = std::distance(b_it, e_it);
if (num_es < m_e_ind)
return false;
a_const_iterator key_b_it = b_it;
std::advance(key_b_it, checked_ind);
a_const_iterator key_e_it = b_it;
std::advance(key_e_it, m_e_ind);
a_const_iterator value_b_it = m_pref_b_it;
std::advance(value_b_it, checked_ind);
a_const_iterator value_e_it = m_pref_b_it;
std::advance(value_e_it, m_e_ind);
return p_traits->equal_prefixes(key_b_it, key_e_it, value_b_it,
value_e_it);
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::leaf_pointer
PB_DS_CLASS_C_DEC::
leftmost_descendant()
{
node_pointer p_pot = *begin();
if (p_pot->m_type == leaf_node)
return (static_cast<leaf_pointer>(p_pot));
_GLIBCXX_DEBUG_ASSERT(p_pot->m_type == i_node);
return static_cast<inode_pointer>(p_pot)->leftmost_descendant();
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::leaf_const_pointer
PB_DS_CLASS_C_DEC::
leftmost_descendant() const
{ return const_cast<inode_pointer>(this)->leftmost_descendant(); }
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::leaf_pointer
PB_DS_CLASS_C_DEC::
rightmost_descendant()
{
const size_type num_children = std::distance(begin(), end());
_GLIBCXX_DEBUG_ASSERT(num_children >= 2);
iterator it = begin();
std::advance(it, num_children - 1);
node_pointer p_pot =* it;
if (p_pot->m_type == leaf_node)
return static_cast<leaf_pointer>(p_pot);
_GLIBCXX_DEBUG_ASSERT(p_pot->m_type == i_node);
return static_cast<inode_pointer>(p_pot)->rightmost_descendant();
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::leaf_const_pointer
PB_DS_CLASS_C_DEC::
rightmost_descendant() const
{ return const_cast<inode_pointer>(this)->rightmost_descendant(); }
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
get_begin_pos() const
{
size_type i = 0;
for (; i < arr_size && m_a_p_children[i] == 0; ++i)
;
return i;
}
#ifdef _GLIBCXX_DEBUG
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::node_debug_info
PB_DS_CLASS_C_DEC::
assert_valid_imp(a_const_pointer p_traits,
const char* __file, int __line) const
{
PB_DS_DEBUG_VERIFY(base_type::m_type == i_node);
PB_DS_DEBUG_VERIFY(static_cast<size_type>(std::distance(pref_b_it(), pref_e_it())) == m_e_ind);
PB_DS_DEBUG_VERIFY(std::distance(begin(), end()) >= 2);
for (typename _Inode::const_iterator it = begin(); it != end(); ++it)
{
node_const_pointer p_nd = *it;
PB_DS_DEBUG_VERIFY(p_nd->m_p_parent == this);
node_debug_info child_ret = p_nd->assert_valid_imp(p_traits,
__file, __line);
PB_DS_DEBUG_VERIFY(static_cast<size_type>(std::distance(child_ret.first, child_ret.second)) >= m_e_ind);
PB_DS_DEBUG_VERIFY(should_be_mine(child_ret.first, child_ret.second, 0, p_traits));
PB_DS_DEBUG_VERIFY(get_pref_pos(child_ret.first, child_ret.second, p_traits) == static_cast<size_type>(it.m_p_p_cur - m_a_p_children));
}
return std::make_pair(pref_b_it(), pref_e_it());
}
#endif
#undef PB_DS_CLASS_T_DEC
#undef PB_DS_CLASS_C_DEC
} // namespace detail
} // namespace __gnu_pbds
#endif