point_iterators.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 bin_search_tree_/point_iterators.hpp
* Contains an implementation class for bin_search_tree_.
*/
#ifndef PB_DS_BIN_SEARCH_TREE_FIND_ITERATORS_HPP
#define PB_DS_BIN_SEARCH_TREE_FIND_ITERATORS_HPP
#include <ext/pb_ds/tag_and_trait.hpp>
#include <debug/debug.h>
namespace __gnu_pbds
{
namespace detail
{
#define PB_DS_TREE_CONST_IT_C_DEC \
bin_search_tree_const_it_< \
Node_Pointer, \
Value_Type, \
Pointer, \
Const_Pointer, \
Reference, \
Const_Reference, \
Is_Forward_Iterator, \
_Alloc>
#define PB_DS_TREE_CONST_ODIR_IT_C_DEC \
bin_search_tree_const_it_< \
Node_Pointer, \
Value_Type, \
Pointer, \
Const_Pointer, \
Reference, \
Const_Reference, \
!Is_Forward_Iterator, \
_Alloc>
#define PB_DS_TREE_IT_C_DEC \
bin_search_tree_it_< \
Node_Pointer, \
Value_Type, \
Pointer, \
Const_Pointer, \
Reference, \
Const_Reference, \
Is_Forward_Iterator, \
_Alloc>
#define PB_DS_TREE_ODIR_IT_C_DEC \
bin_search_tree_it_< \
Node_Pointer, \
Value_Type, \
Pointer, \
Const_Pointer, \
Reference, \
Const_Reference, \
!Is_Forward_Iterator, \
_Alloc>
/// Const iterator.
template<typename Node_Pointer,
typename Value_Type,
typename Pointer,
typename Const_Pointer,
typename Reference,
typename Const_Reference,
bool Is_Forward_Iterator,
typename _Alloc>
class bin_search_tree_const_it_
{
public:
typedef std::bidirectional_iterator_tag iterator_category;
typedef typename _Alloc::difference_type difference_type;
typedef Value_Type value_type;
typedef Pointer pointer;
typedef Const_Pointer const_pointer;
typedef Reference reference;
typedef Const_Reference const_reference;
inline
bin_search_tree_const_it_(const Node_Pointer p_nd = 0)
: m_p_nd(const_cast<Node_Pointer>(p_nd))
{ }
inline
bin_search_tree_const_it_(const PB_DS_TREE_CONST_ODIR_IT_C_DEC& other)
: m_p_nd(other.m_p_nd)
{ }
inline
PB_DS_TREE_CONST_IT_C_DEC&
operator=(const PB_DS_TREE_CONST_IT_C_DEC& other)
{
m_p_nd = other.m_p_nd;
return *this;
}
inline
PB_DS_TREE_CONST_IT_C_DEC&
operator=(const PB_DS_TREE_CONST_ODIR_IT_C_DEC& other)
{
m_p_nd = other.m_p_nd;
return *this;
}
inline const_pointer
operator->() const
{
_GLIBCXX_DEBUG_ASSERT(m_p_nd != 0);
return &m_p_nd->m_value;
}
inline const_reference
operator*() const
{
_GLIBCXX_DEBUG_ASSERT(m_p_nd != 0);
return m_p_nd->m_value;
}
inline bool
operator==(const PB_DS_TREE_CONST_IT_C_DEC & other) const
{ return m_p_nd == other.m_p_nd; }
inline bool
operator==(const PB_DS_TREE_CONST_ODIR_IT_C_DEC & other) const
{ return m_p_nd == other.m_p_nd; }
inline bool
operator!=(const PB_DS_TREE_CONST_IT_C_DEC& other) const
{ return m_p_nd != other.m_p_nd; }
inline bool
operator!=(const PB_DS_TREE_CONST_ODIR_IT_C_DEC& other) const
{ return m_p_nd != other.m_p_nd; }
inline PB_DS_TREE_CONST_IT_C_DEC&
operator++()
{
_GLIBCXX_DEBUG_ASSERT(m_p_nd != 0);
inc(integral_constant<int,Is_Forward_Iterator>());
return *this;
}
inline PB_DS_TREE_CONST_IT_C_DEC
operator++(int)
{
PB_DS_TREE_CONST_IT_C_DEC ret_it(m_p_nd);
operator++();
return ret_it;
}
inline PB_DS_TREE_CONST_IT_C_DEC&
operator--()
{
dec(integral_constant<int,Is_Forward_Iterator>());
return *this;
}
inline PB_DS_TREE_CONST_IT_C_DEC
operator--(int)
{
PB_DS_TREE_CONST_IT_C_DEC ret_it(m_p_nd);
operator--();
return ret_it;
}
protected:
inline void
inc(false_type)
{ dec(true_type()); }
void
inc(true_type)
{
if (m_p_nd->special()&&
m_p_nd->m_p_parent->m_p_parent == m_p_nd)
{
m_p_nd = m_p_nd->m_p_left;
return;
}
if (m_p_nd->m_p_right != 0)
{
m_p_nd = m_p_nd->m_p_right;
while (m_p_nd->m_p_left != 0)
m_p_nd = m_p_nd->m_p_left;
return;
}
Node_Pointer p_y = m_p_nd->m_p_parent;
while (m_p_nd == p_y->m_p_right)
{
m_p_nd = p_y;
p_y = p_y->m_p_parent;
}
if (m_p_nd->m_p_right != p_y)
m_p_nd = p_y;
}
inline void
dec(false_type)
{ inc(true_type()); }
void
dec(true_type)
{
if (m_p_nd->special() && m_p_nd->m_p_parent->m_p_parent == m_p_nd)
{
m_p_nd = m_p_nd->m_p_right;
return;
}
if (m_p_nd->m_p_left != 0)
{
Node_Pointer p_y = m_p_nd->m_p_left;
while (p_y->m_p_right != 0)
p_y = p_y->m_p_right;
m_p_nd = p_y;
return;
}
Node_Pointer p_y = m_p_nd->m_p_parent;
while (m_p_nd == p_y->m_p_left)
{
m_p_nd = p_y;
p_y = p_y->m_p_parent;
}
if (m_p_nd->m_p_left != p_y)
m_p_nd = p_y;
}
public:
Node_Pointer m_p_nd;
};
/// Iterator.
template<typename Node_Pointer,
typename Value_Type,
typename Pointer,
typename Const_Pointer,
typename Reference,
typename Const_Reference,
bool Is_Forward_Iterator,
typename _Alloc>
class bin_search_tree_it_ : public PB_DS_TREE_CONST_IT_C_DEC
{
public:
inline
bin_search_tree_it_(const Node_Pointer p_nd = 0)
: PB_DS_TREE_CONST_IT_C_DEC((Node_Pointer)p_nd)
{ }
inline
bin_search_tree_it_(const PB_DS_TREE_ODIR_IT_C_DEC& other)
: PB_DS_TREE_CONST_IT_C_DEC(other.m_p_nd)
{ }
inline
PB_DS_TREE_IT_C_DEC&
operator=(const PB_DS_TREE_IT_C_DEC& other)
{
base_it_type::m_p_nd = other.m_p_nd;
return *this;
}
inline
PB_DS_TREE_IT_C_DEC&
operator=(const PB_DS_TREE_ODIR_IT_C_DEC& other)
{
base_it_type::m_p_nd = other.m_p_nd;
return *this;
}
inline typename PB_DS_TREE_CONST_IT_C_DEC::pointer
operator->() const
{
_GLIBCXX_DEBUG_ASSERT(base_it_type::m_p_nd != 0);
return &base_it_type::m_p_nd->m_value;
}
inline typename PB_DS_TREE_CONST_IT_C_DEC::reference
operator*() const
{
_GLIBCXX_DEBUG_ASSERT(base_it_type::m_p_nd != 0);
return base_it_type::m_p_nd->m_value;
}
inline PB_DS_TREE_IT_C_DEC&
operator++()
{
PB_DS_TREE_CONST_IT_C_DEC:: operator++();
return *this;
}
inline PB_DS_TREE_IT_C_DEC
operator++(int)
{
PB_DS_TREE_IT_C_DEC ret_it(base_it_type::m_p_nd);
operator++();
return ret_it;
}
inline PB_DS_TREE_IT_C_DEC&
operator--()
{
PB_DS_TREE_CONST_IT_C_DEC:: operator--();
return *this;
}
inline PB_DS_TREE_IT_C_DEC
operator--(int)
{
PB_DS_TREE_IT_C_DEC ret_it(base_it_type::m_p_nd);
operator--();
return ret_it;
}
protected:
typedef PB_DS_TREE_CONST_IT_C_DEC base_it_type;
};
#undef PB_DS_TREE_CONST_IT_C_DEC
#undef PB_DS_TREE_CONST_ODIR_IT_C_DEC
#undef PB_DS_TREE_IT_C_DEC
#undef PB_DS_TREE_ODIR_IT_C_DEC
} // namespace detail
} // namespace __gnu_pbds
#endif