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/usr/include/c++/11/ext/pb_ds/detail/left_child_next_sibling_heap_/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 left_child_next_sibling_heap_/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_LEFT_CHILD_NEXT_SIBLING_HEAP_CONST_ITERATOR_HPP
    43	#define PB_DS_LEFT_CHILD_NEXT_SIBLING_HEAP_CONST_ITERATOR_HPP
    44	
    45	#include <ext/pb_ds/detail/left_child_next_sibling_heap_/point_const_iterator.hpp>
    46	#include <debug/debug.h>
    47	
    48	namespace __gnu_pbds
    49	{
    50	  namespace detail
    51	  {
    52	#define PB_DS_CLASS_C_DEC  \
    53	    left_child_next_sibling_heap_const_iterator_<Node, _Alloc>
    54	
    55	#define PB_DS_BASIC_HEAP_CIT_BASE \
    56	    left_child_next_sibling_heap_node_point_const_iterator_<Node, _Alloc>
    57	
    58	    /// Const point-type iterator.
    59	    template<typename Node, typename _Alloc>
    60	    class left_child_next_sibling_heap_const_iterator_
    61	    : public PB_DS_BASIC_HEAP_CIT_BASE
    62	    {
    63	    private:
    64	      typedef PB_DS_BASIC_HEAP_CIT_BASE 	      	base_type;
    65	      typedef typename base_type::node_pointer		node_pointer;
    66	
    67	    public:
    68	      /// Category.
    69	      typedef std::forward_iterator_tag 		iterator_category;
    70	
    71	      /// Difference type.
    72	      typedef typename _Alloc::difference_type 		difference_type;
    73	
    74	      /// Iterator's value type.
    75	      typedef typename base_type::value_type 		value_type;
    76	
    77	      /// Iterator's pointer type.
    78	      typedef typename base_type::pointer 		pointer;
    79	
    80	      /// Iterator's const pointer type.
    81	      typedef typename base_type::const_pointer 	const_pointer;
    82	
    83	      /// Iterator's reference type.
    84	      typedef typename base_type::reference 		reference;
    85	
    86	      /// Iterator's const reference type.
    87	      typedef typename base_type::const_reference 	const_reference;
    88	
    89	      inline
    90	      left_child_next_sibling_heap_const_iterator_(node_pointer p_nd)
    91	      : base_type(p_nd)
    92	      { }
    93	
    94	      /// Default constructor.
    95	      inline
    96	      left_child_next_sibling_heap_const_iterator_()
    97	      { }
    98	
    99	      /// Copy constructor.
   100	      inline
   101	      left_child_next_sibling_heap_const_iterator_(const PB_DS_CLASS_C_DEC& other) : base_type(other)
   102	      { }
   103	
   104	      /// Compares content to a different iterator object.
   105	      bool
   106	      operator==(const PB_DS_CLASS_C_DEC& other) const
   107	      { return (base_type::m_p_nd == other.m_p_nd); }
   108	
   109	      /// Compares content (negatively) to a different iterator object.
   110	      bool
   111	      operator!=(const PB_DS_CLASS_C_DEC& other) const
   112	      { return (base_type::m_p_nd != other.m_p_nd); }
   113	
   114	      PB_DS_CLASS_C_DEC&
   115	      operator++()
   116	      {
   117		_GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd != 0);
   118		inc();
   119		return (*this);
   120	      }
   121	
   122	      PB_DS_CLASS_C_DEC
   123	      operator++(int)
   124	      {
   125		PB_DS_CLASS_C_DEC ret_it(base_type::m_p_nd);
   126		operator++();
   127		return (ret_it);
   128	      }
   129	
   130	    private:
   131	      void
   132	      inc()
   133	      {
   134		if (base_type::m_p_nd->m_p_next_sibling != 0)
   135		  {
   136		    base_type::m_p_nd = base_type::m_p_nd->m_p_next_sibling;
   137		    while (base_type::m_p_nd->m_p_l_child != 0)
   138		      base_type::m_p_nd = base_type::m_p_nd->m_p_l_child;
   139		    return;
   140		  }
   141	
   142		while (true)
   143		  {
   144		    node_pointer p_next = base_type::m_p_nd;
   145		    base_type::m_p_nd = base_type::m_p_nd->m_p_prev_or_parent;
   146		    if (base_type::m_p_nd == 0
   147			|| base_type::m_p_nd->m_p_l_child == p_next)
   148		      return;
   149		  }
   150	      }
   151	    };
   152	
   153	#undef PB_DS_CLASS_C_DEC
   154	#undef PB_DS_BASIC_HEAP_CIT_BASE
   155	
   156	  } // namespace detail
   157	} // namespace __gnu_pbds
   158	
   159	#endif