mingw/lib/gcc/mingw32/4.3.3/include/c++/ext/pb_ds/detail/pat_trie_/const_child_iterator.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006 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 2, 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 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19 // MA 02111-1307, USA.
  20
  21 // As a special exception, you may use this file as part of a free
  22 // software library without restriction.  Specifically, if other files
  23 // instantiate templates or use macros or inline functions from this
  24 // file, or you compile this file and link it with other files to
  25 // produce an executable, this file does not by itself cause the
  26 // resulting executable to be covered by the GNU General Public
  27 // License.  This exception does not however invalidate any other
  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice
  36 // and this permission notice appear in supporting documentation. None
  37 // of the above authors, nor IBM Haifa Research Laboratories, make any
  38 // representation about the suitability of this software for any
  39 // purpose. It is provided "as is" without express or implied
  40 // warranty.
  41
  42 /**
  43  * @file const_child_iterator.hpp
  44  * Contains a const_iterator for a patricia tree.
  45  */
  46
  47 struct const_iterator
  48 {
  49 public:
  50   typedef std::forward_iterator_tag iterator_category;
  51
  52   typedef typename Allocator::difference_type difference_type;
  53
  54   typedef node_pointer value_type;
  55
  56   typedef node_pointer_pointer pointer;
  57
  58   typedef node_pointer_reference reference;
  59
  60 public:
  61   inline
  62   const_iterator(node_pointer_pointer p_p_cur = NULL,
  63                  node_pointer_pointer p_p_end = NULL)
  64   : m_p_p_cur(p_p_cur), m_p_p_end(p_p_end)
  65   { }
  66
  67   inline bool
  68   operator==(const const_iterator& other) const
  69   { return m_p_p_cur == other.m_p_p_cur; }
  70
  71   inline bool
  72   operator!=(const const_iterator& other) const
  73   { return m_p_p_cur != other.m_p_p_cur; }
  74
  75   inline const_iterator&
  76   operator++()
  77   {
  78     do
  79       ++m_p_p_cur;
  80     while (m_p_p_cur != m_p_p_end&& * m_p_p_cur == NULL);
  81     return *this;
  82   }
  83
  84   inline const_iterator
  85   operator++(int)
  86   {
  87     const_iterator ret_it(*this);
  88     operator++();
  89     return ret_it;
  90   }
  91
  92   const node_pointer_pointer
  93   operator->() const
  94   {
  95     _GLIBCXX_DEBUG_ONLY(assert_referencible();)
  96     return (m_p_p_cur);
  97   }
  98
  99   const_node_pointer
 100   operator*() const
 101   {
 102     _GLIBCXX_DEBUG_ONLY(assert_referencible();)
 103     return (*m_p_p_cur);
 104   }
 105
 106 protected:
 107 #ifdef _GLIBCXX_DEBUG
 108   void
 109   assert_referencible() const
 110   { _GLIBCXX_DEBUG_ASSERT(m_p_p_cur != m_p_p_end&& * m_p_p_cur != NULL); }
 111 #endif
 112
 113 public:
 114   node_pointer_pointer m_p_p_cur;
 115   node_pointer_pointer m_p_p_end;
 116 };
 117