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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2015 Free Software Foundation, Inc.
  4. //
  5. // This file is part of the GNU ISO C++ Library.  This library is free
  6. // software; you can redistribute it and/or modify it under the terms
  7. // of the GNU General Public License as published by the Free Software
  8. // Foundation; either version 3, or (at your option) any later
  9. // version.
  10.  
  11. // This library is distributed in the hope that it will be useful, but
  12. // WITHOUT ANY WARRANTY; without even the implied warranty of
  13. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14. // General Public License for more details.
  15.  
  16. // Under Section 7 of GPL version 3, you are granted additional
  17. // permissions described in the GCC Runtime Library Exception, version
  18. // 3.1, as published by the Free Software Foundation.
  19.  
  20. // You should have received a copy of the GNU General Public License and
  21. // a copy of the GCC Runtime Library Exception along with this program;
  22. // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23. // <http://www.gnu.org/licenses/>.
  24.  
  25. // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  26.  
  27. // Permission to use, copy, modify, sell, and distribute this software
  28. // is hereby granted without fee, provided that the above copyright
  29. // notice appears in all copies, and that both that copyright notice
  30. // and this permission notice appear in supporting documentation. None
  31. // of the above authors, nor IBM Haifa Research Laboratories, make any
  32. // representation about the suitability of this software for any
  33. // purpose. It is provided "as is" without express or implied
  34. // warranty.
  35.  
  36. /**
  37.  * @file binary_heap_/point_const_iterator.hpp
  38.  * Contains an iterator class returned by the table's const find and insert
  39.  * methods.
  40.  */
  41.  
  42. #ifndef PB_DS_BINARY_HEAP_CONST_FIND_ITERATOR_HPP
  43. #define PB_DS_BINARY_HEAP_CONST_FIND_ITERATOR_HPP
  44.  
  45. #include <ext/pb_ds/tag_and_trait.hpp>
  46. #include <debug/debug.h>
  47.  
  48. namespace __gnu_pbds
  49. {
  50.   namespace detail
  51.   {
  52.     /// Const point-type iterator.
  53.     template<typename Value_Type, typename Entry, bool Simple,
  54.              typename _Alloc>
  55.     class binary_heap_point_const_iterator_
  56.     {
  57.     protected:
  58.       typedef typename _Alloc::template rebind<Entry>::other::pointer entry_pointer;
  59.  
  60.     public:
  61.       /// Category.
  62.       typedef trivial_iterator_tag iterator_category;
  63.  
  64.       /// Difference type.
  65.       typedef trivial_iterator_difference_type difference_type;
  66.  
  67.       /// Iterator's value type.
  68.       typedef Value_Type value_type;
  69.  
  70.       /// Iterator's pointer type.
  71.       typedef typename _Alloc::template rebind<value_type>::other::pointer
  72.       pointer;
  73.  
  74.       /// Iterator's const pointer type.
  75.       typedef
  76.       typename _Alloc::template rebind<value_type>::other::const_pointer
  77.       const_pointer;
  78.  
  79.       /// Iterator's reference type.
  80.       typedef
  81.       typename _Alloc::template rebind<value_type>::other::reference
  82.       reference;
  83.  
  84.       /// Iterator's const reference type.
  85.       typedef
  86.       typename _Alloc::template rebind<value_type>::other::const_reference
  87.       const_reference;
  88.  
  89.       inline
  90.       binary_heap_point_const_iterator_(entry_pointer p_e) : m_p_e(p_e)
  91.       { }
  92.  
  93.       /// Default constructor.
  94.       inline
  95.       binary_heap_point_const_iterator_() : m_p_e(0) { }
  96.  
  97.       /// Copy constructor.
  98.       inline
  99.       binary_heap_point_const_iterator_(const binary_heap_point_const_iterator_& other)
  100.       : m_p_e(other.m_p_e)
  101.       { }
  102.  
  103.       /// Access.
  104.       inline const_pointer
  105.       operator->() const
  106.       {
  107.         _GLIBCXX_DEBUG_ASSERT(m_p_e != 0);
  108.         return to_ptr(integral_constant<int, Simple>());
  109.       }
  110.  
  111.       /// Access.
  112.       inline const_reference
  113.       operator*() const
  114.       {
  115.         _GLIBCXX_DEBUG_ASSERT(m_p_e != 0);
  116.         return *to_ptr(integral_constant<int, Simple>());
  117.       }
  118.  
  119.       /// Compares content to a different iterator object.
  120.       inline bool
  121.       operator==(const binary_heap_point_const_iterator_& other) const
  122.       { return m_p_e == other.m_p_e; }
  123.  
  124.       /// Compares content (negatively) to a different iterator object.
  125.       inline bool
  126.       operator!=(const binary_heap_point_const_iterator_& other) const
  127.       { return m_p_e != other.m_p_e; }
  128.  
  129.     private:
  130.       inline const_pointer
  131.       to_ptr(true_type) const
  132.       { return m_p_e; }
  133.  
  134.       inline const_pointer
  135.       to_ptr(false_type) const
  136.       { return *m_p_e; }
  137.  
  138.     public:
  139.       entry_pointer m_p_e;
  140.     };
  141.   } // namespace detail
  142. } // namespace __gnu_pbds
  143.  
  144. #endif
  145.