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/usr/include/c++/11/ext/pb_ds/detail/binary_heap_/point_const_iterator.hpp


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     1	// -*- C++ -*-
     2	
     3	// Copyright (C) 2005-2021 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 rebind_traits<_Alloc, Entry>::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 rebind_traits<_Alloc, value_type>::pointer pointer;
    72	
    73	      /// Iterator's const pointer type.
    74	      typedef typename rebind_traits<_Alloc, value_type>::const_pointer
    75		const_pointer;
    76	
    77	      /// Iterator's reference type.
    78	      typedef typename rebind_traits<_Alloc, value_type>::reference
    79		reference;
    80	
    81	      /// Iterator's const reference type.
    82	      typedef typename rebind_traits<_Alloc, value_type>::const_reference
    83		const_reference;
    84	
    85	      inline
    86	      binary_heap_point_const_iterator_(entry_pointer p_e) : m_p_e(p_e)
    87	      { }
    88	
    89	      /// Default constructor.
    90	      inline
    91	      binary_heap_point_const_iterator_() : m_p_e(0) { }
    92	
    93	      /// Copy constructor.
    94	      inline
    95	      binary_heap_point_const_iterator_(const binary_heap_point_const_iterator_& other)
    96	      : m_p_e(other.m_p_e)
    97	      { }
    98	
    99	      /// Access.
   100	      inline const_pointer
   101	      operator->() const
   102	      {
   103		_GLIBCXX_DEBUG_ASSERT(m_p_e != 0);
   104		return to_ptr(integral_constant<int, Simple>());
   105	      }
   106	
   107	      /// Access.
   108	      inline const_reference
   109	      operator*() const
   110	      {
   111		_GLIBCXX_DEBUG_ASSERT(m_p_e != 0);
   112		return *to_ptr(integral_constant<int, Simple>());
   113	      }
   114	
   115	      /// Compares content to a different iterator object.
   116	      inline bool
   117	      operator==(const binary_heap_point_const_iterator_& other) const
   118	      { return m_p_e == other.m_p_e; }
   119	
   120	      /// Compares content (negatively) to a different iterator object.
   121	      inline bool
   122	      operator!=(const binary_heap_point_const_iterator_& other) const
   123	      { return m_p_e != other.m_p_e; }
   124	
   125	    private:
   126	      inline const_pointer
   127	      to_ptr(true_type) const
   128	      { return m_p_e; }
   129	
   130	      inline const_pointer
   131	      to_ptr(false_type) const
   132	      { return *m_p_e; }
   133	
   134	    public:
   135	      entry_pointer m_p_e;
   136	    };
   137	  } // namespace detail
   138	} // namespace __gnu_pbds
   139	
   140	#endif