libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/r_erase_fn_imps.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 r_erase_fn_imps.hpp
  44  * Contains an implementation class for bin_search_tree_.
  45  */
  46
  47 PB_DS_CLASS_T_DEC
  48 inline void
  49 PB_DS_CLASS_C_DEC::
  50 actual_erase_node(node_pointer p_z)
  51 {
  52   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
  53   --m_size;
  54   _GLIBCXX_DEBUG_ONLY(erase_existing(PB_DS_V2F(p_z->m_value)));
  55   p_z->~node();
  56   s_node_allocator.deallocate(p_z, 1);
  57 }
  58
  59 PB_DS_CLASS_T_DEC
  60 inline void
  61 PB_DS_CLASS_C_DEC::
  62 update_min_max_for_erased_node(node_pointer p_z)
  63 {
  64   if (m_size == 1)
  65     {
  66       m_p_head->m_p_left = m_p_head->m_p_right = m_p_head;
  67       return;
  68     }
  69
  70   if (m_p_head->m_p_left == p_z)
  71     {
  72       iterator it(p_z);
  73       ++it;
  74       m_p_head->m_p_left = it.m_p_nd;
  75     }
  76   else if (m_p_head->m_p_right == p_z)
  77     {
  78       iterator it(p_z);
  79       --it;
  80       m_p_head->m_p_right = it.m_p_nd;
  81     }
  82 }
  83
  84 PB_DS_CLASS_T_DEC
  85 void
  86 PB_DS_CLASS_C_DEC::
  87 clear()
  88 {
  89   _GLIBCXX_DEBUG_ONLY(assert_valid(true, true);)
  90   clear_imp(m_p_head->m_p_parent);
  91   m_size = 0;
  92   initialize();
  93   _GLIBCXX_DEBUG_ONLY(debug_base::clear();)
  94   _GLIBCXX_DEBUG_ONLY(assert_valid(true, true);)
  95 }
  96
  97 PB_DS_CLASS_T_DEC
  98 void
  99 PB_DS_CLASS_C_DEC::
 100 clear_imp(node_pointer p_nd)
 101 {
 102   if (p_nd == NULL)
 103     return;
 104   clear_imp(p_nd->m_p_left);
 105   clear_imp(p_nd->m_p_right);
 106   p_nd->~Node();
 107   s_node_allocator.deallocate(p_nd, 1);
 108 }
 109