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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2010 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 binary_heap_/point_const_iterator.hpp

 * Contains an iterator class returned by the table's const find and insert

 * methods.

 */

#ifndef PB_DS_BINARY_HEAP_CONST_FIND_ITERATOR_HPP

#define PB_DS_BINARY_HEAP_CONST_FIND_ITERATOR_HPP

#include <ext/pb_ds/tag_and_trait.hpp>

#include <debug/debug.h>

namespace __gnu_pbds

{

  namespace detail

  {

    /// Const point-type iterator.

    template<typename Value_Type, typename Entry, bool Simple,

             typename _Alloc>

    class binary_heap_point_const_iterator_

    {

    protected:

      typedef typename _Alloc::template rebind<Entry>::other::pointer entry_pointer;

    public:

      /// Category.

      typedef trivial_iterator_tag iterator_category;

      /// Difference type.

      typedef trivial_iterator_difference_type difference_type;

      /// Iterator's value type.

      typedef Value_Type value_type;

      /// Iterator's pointer type.

      typedef typename _Alloc::template rebind<value_type>::other::pointer

      pointer;

      /// Iterator's const pointer type.

      typedef

      typename _Alloc::template rebind<value_type>::other::const_pointer

      const_pointer;

      /// Iterator's reference type.

      typedef

      typename _Alloc::template rebind<value_type>::other::reference

      reference;

      /// Iterator's const reference type.

      typedef

      typename _Alloc::template rebind<value_type>::other::const_reference

      const_reference;

      inline

      binary_heap_point_const_iterator_(entry_pointer p_e) : m_p_e(p_e)

      { }

      /// Default constructor.

      inline

      binary_heap_point_const_iterator_() : m_p_e(0) { }

      /// Copy constructor.

      inline

      binary_heap_point_const_iterator_(const binary_heap_point_const_iterator_& other)

      : m_p_e(other.m_p_e)

      { }

      /// Access.

      inline const_pointer

      operator->() const

      {

        _GLIBCXX_DEBUG_ASSERT(m_p_e != 0);

        return to_ptr(integral_constant<int, Simple>());

      }

      /// Access.

      inline const_reference

      operator*() const

      {

        _GLIBCXX_DEBUG_ASSERT(m_p_e != 0);

        return *to_ptr(integral_constant<int, Simple>());

      }

      /// Compares content to a different iterator object.

      inline bool

      operator==(const binary_heap_point_const_iterator_& other) const

      { return m_p_e == other.m_p_e; }

      /// Compares content (negatively) to a different iterator object.

      inline bool

      operator!=(const binary_heap_point_const_iterator_& other) const

      { return m_p_e != other.m_p_e; }

    private:

      inline const_pointer

      to_ptr(true_type) const

      { return m_p_e; }

      inline const_pointer

      to_ptr(false_type) const

      { return *m_p_e; }

    public:

      entry_pointer m_p_e;

    };

  } // namespace detail

} // namespace __gnu_pbds

#endif