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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2007, 2009 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 node_iterators.hpp

 * Contains an implementation class for ov_tree_.

 */

#ifndef PB_DS_OV_TREE_NODE_ITERATORS_HPP

#define PB_DS_OV_TREE_NODE_ITERATORS_HPP

#include <ext/pb_ds/tag_and_trait.hpp>

#include <ext/pb_ds/detail/type_utils.hpp>

#include <debug/debug.h>

namespace __gnu_pbds

{

  namespace detail

  {

#define PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC \

    ov_tree_node_const_it_<Value_Type, Metadata_Type, Allocator>

    // Const node reference.

    template<typename Value_Type, typename Metadata_Type, class Allocator>

    class ov_tree_node_const_it_

    {

    protected:

      typedef

      typename Allocator::template rebind<

      Value_Type>::other::pointer

      pointer;

      typedef

      typename Allocator::template rebind<

        Value_Type>::other::const_pointer

      const_pointer;

      typedef

      typename Allocator::template rebind<

        Metadata_Type>::other::const_pointer

      const_metadata_pointer;

      typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC this_type;

    protected:

      template<typename Ptr>

      inline static Ptr

      mid_pointer(Ptr p_begin, Ptr p_end)

      {

        _GLIBCXX_DEBUG_ASSERT(p_end >= p_begin);

        return (p_begin + (p_end - p_begin) / 2);

      }

    public:

      typedef trivial_iterator_tag iterator_category;

      typedef trivial_iterator_difference_type difference_type;

      typedef

      typename Allocator::template rebind<

        Value_Type>::other::const_pointer

      value_type;

      typedef

      typename Allocator::template rebind<

        typename remove_const<

        Value_Type>::type>::other::const_pointer

      reference;

      typedef

      typename Allocator::template rebind<

        typename remove_const<

        Value_Type>::type>::other::const_pointer

      const_reference;

      typedef Metadata_Type metadata_type;

      typedef

      typename Allocator::template rebind<

        metadata_type>::other::const_reference

      const_metadata_reference;

    public:

      inline

      ov_tree_node_const_it_(const_pointer p_nd = NULL,  const_pointer p_begin_nd = NULL,  const_pointer p_end_nd = NULL,  const_metadata_pointer p_metadata = NULL) : m_p_value(const_cast<pointer>(p_nd)), m_p_begin_value(const_cast<pointer>(p_begin_nd)), m_p_end_value(const_cast<pointer>(p_end_nd)), m_p_metadata(p_metadata)

      { }

      inline const_reference

      operator*() const

      { return m_p_value; }

      inline const_metadata_reference

      get_metadata() const

      {

        enum

          {

            has_metadata = !is_same<Metadata_Type, null_node_metadata>::value

          };

        PB_DS_STATIC_ASSERT(should_have_metadata, has_metadata);

        _GLIBCXX_DEBUG_ASSERT(m_p_metadata != NULL);

        return *m_p_metadata;

      }

      inline this_type

      get_l_child() const

      {

        if (m_p_begin_value == m_p_value)

          return (this_type(m_p_begin_value, m_p_begin_value, m_p_begin_value));

        const_metadata_pointer p_begin_metadata =

          m_p_metadata - (m_p_value - m_p_begin_value);

        return (this_type(mid_pointer(m_p_begin_value, m_p_value),

                          m_p_begin_value,

                          m_p_value,

                          mid_pointer(p_begin_metadata, m_p_metadata)));

      }

      inline this_type

      get_r_child() const

      {

        if (m_p_value == m_p_end_value)

          return (this_type(m_p_end_value,  m_p_end_value,  m_p_end_value));

        const_metadata_pointer p_end_metadata =

          m_p_metadata + (m_p_end_value - m_p_value);

        return (this_type(mid_pointer(m_p_value + 1, m_p_end_value),

                          m_p_value + 1,

                          m_p_end_value,(m_p_metadata == NULL) ?

                          NULL : mid_pointer(m_p_metadata + 1, p_end_metadata)));

      }

      inline bool

      operator==(const this_type& other) const

      {

        const bool is_end = m_p_begin_value == m_p_end_value;

        const bool is_other_end = other.m_p_begin_value == other.m_p_end_value;

        if (is_end)

          return (is_other_end);

        if (is_other_end)

          return (is_end);

        return m_p_value == other.m_p_value;

      }

      inline bool

      operator!=(const this_type& other) const

      { return !operator==(other); }

    public:

      pointer m_p_value;

      pointer m_p_begin_value;

      pointer m_p_end_value;

      const_metadata_pointer m_p_metadata;

    };

#define PB_DS_OV_TREE_NODE_ITERATOR_C_DEC \

    ov_tree_node_it_<Value_Type, Metadata_Type, Allocator>

    // Node reference.

    template<typename Value_Type, typename Metadata_Type, class Allocator>

    class ov_tree_node_it_ : public PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC

    {

    private:

      typedef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC this_type;

      typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC base_type;

      typedef typename base_type::pointer pointer;

      typedef typename base_type::const_pointer const_pointer;

      typedef

      typename base_type::const_metadata_pointer

      const_metadata_pointer;

    public:

      typedef trivial_iterator_tag iterator_category;

      typedef trivial_iterator_difference_type difference_type;

      typedef

      typename Allocator::template rebind<

        Value_Type>::other::pointer

      value_type;

      typedef

      typename Allocator::template rebind<

        typename remove_const<

        Value_Type>::type>::other::pointer

      reference;

      typedef

      typename Allocator::template rebind<

        typename remove_const<

        Value_Type>::type>::other::pointer

      const_reference;

    public:

      inline

      ov_tree_node_it_(const_pointer p_nd = NULL,  const_pointer p_begin_nd = NULL,  const_pointer p_end_nd = NULL,  const_metadata_pointer p_metadata = NULL) : base_type(p_nd,  p_begin_nd,  p_end_nd,  p_metadata)

      { }

      // Access.

      inline reference

      operator*() const

      { return reference(base_type::m_p_value); }

      // Returns the node reference associated with the left node.

      inline ov_tree_node_it_

      get_l_child() const

      {

        if (base_type::m_p_begin_value == base_type::m_p_value)

          return (this_type(base_type::m_p_begin_value,  base_type::m_p_begin_value,  base_type::m_p_begin_value));

        const_metadata_pointer p_begin_metadata =

          base_type::m_p_metadata - (base_type::m_p_value - base_type::m_p_begin_value);

        return (this_type(base_type::mid_pointer(base_type::m_p_begin_value, base_type::m_p_value),

                          base_type::m_p_begin_value,

                          base_type::m_p_value,

                          base_type::mid_pointer(p_begin_metadata, base_type::m_p_metadata)));

      }

      // Returns the node reference associated with the right node.

      inline ov_tree_node_it_

      get_r_child() const

      {

        if (base_type::m_p_value == base_type::m_p_end_value)

          return (this_type(base_type::m_p_end_value,  base_type::m_p_end_value,  base_type::m_p_end_value));

        const_metadata_pointer p_end_metadata =

          base_type::m_p_metadata + (base_type::m_p_end_value - base_type::m_p_value);

        return (this_type(base_type::mid_pointer(base_type::m_p_value + 1, base_type::m_p_end_value),

                          base_type::m_p_value + 1,

                          base_type::m_p_end_value,(base_type::m_p_metadata == NULL)?

                          NULL : base_type::mid_pointer(base_type::m_p_metadata + 1, p_end_metadata)));

      }

    };

#undef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC

#undef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC

} // namespace detail

} // namespace __gnu_pbds

#endif