libstdc++-v3/include/ext/pb_ds/detail/ov_tree_map_/erase_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2022 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 ov_tree_map_/erase_fn_imps.hpp
  38  * Contains an implementation class for ov_tree_.
  39  */
  40
  41 #ifdef PB_DS_CLASS_C_DEC
  42
  43 PB_DS_CLASS_T_DEC
  44 void
  45 PB_DS_CLASS_C_DEC::
  46 clear()
  47 {
  48   PB_DS_ASSERT_VALID((*this))
  49   if (m_size == 0)
  50     {
  51       return;
  52     }
  53   else
  54     {
  55       reallocate_metadata((node_update* )this, 0);
  56       cond_dtor<size_type> cd(m_a_values, m_end_it, m_size);
  57     }
  58
  59   _GLIBCXX_DEBUG_ONLY(debug_base::clear();)
  60   m_a_values = 0;
  61   m_size = 0;
  62   m_end_it = m_a_values;
  63   PB_DS_ASSERT_VALID((*this))
  64 }
  65
  66 PB_DS_CLASS_T_DEC
  67 template<typename Pred>
  68 inline typename PB_DS_CLASS_C_DEC::size_type
  69 PB_DS_CLASS_C_DEC::
  70 erase_if(Pred pred)
  71 {
  72   PB_DS_ASSERT_VALID((*this))
  73
  74 #ifdef PB_DS_REGRESSION
  75     typename _Alloc::group_adjustor adjust(m_size);
  76 #endif
  77
  78   size_type new_size = 0;
  79   size_type num_val_ersd = 0;
  80
  81   for (iterator source_it = begin(); source_it != m_end_it; ++source_it)
  82     if (!pred(*source_it))
  83       ++new_size;
  84     else
  85       ++num_val_ersd;
  86
  87   if (new_size == 0)
  88     {
  89       clear();
  90       return num_val_ersd;
  91     }
  92
  93   value_vector a_new_values = s_value_alloc.allocate(new_size);
  94   iterator target_it = a_new_values;
  95   cond_dtor<size_type> cd(a_new_values, target_it, new_size);
  96   _GLIBCXX_DEBUG_ONLY(debug_base::clear());
  97   for (iterator source_it = begin(); source_it != m_end_it; ++source_it)
  98     {
  99       if (!pred(*source_it))
 100         {
 101           new (const_cast<void*>(static_cast<const void*>(target_it)))
 102             value_type(*source_it);
 103
 104           _GLIBCXX_DEBUG_ONLY(debug_base::insert_new(PB_DS_V2F(*source_it)));
 105           ++target_it;
 106         }
 107     }
 108
 109   reallocate_metadata((node_update*)this, new_size);
 110   cd.set_no_action();
 111
 112   {
 113     cond_dtor<size_type> cd1(m_a_values, m_end_it, m_size);
 114   }
 115
 116   m_a_values = a_new_values;
 117   m_size = new_size;
 118   m_end_it = target_it;
 119   update(node_begin(), (node_update*)this);
 120   PB_DS_ASSERT_VALID((*this))
 121   return num_val_ersd;
 122 }
 123
 124 PB_DS_CLASS_T_DEC
 125 template<typename It>
 126 It
 127 PB_DS_CLASS_C_DEC::
 128 erase_imp(It it)
 129 {
 130   PB_DS_ASSERT_VALID((*this))
 131   if (it == end())
 132     return end();
 133
 134   PB_DS_CHECK_KEY_EXISTS(PB_DS_V2F(*it))
 135
 136 #ifdef PB_DS_REGRESSION
 137     typename _Alloc::group_adjustor adjust(m_size);
 138 #endif
 139
 140   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
 141   value_vector a_values = s_value_alloc.allocate(m_size - 1);
 142   iterator source_it = begin();
 143   iterator source_end_it = end();
 144   iterator target_it = a_values;
 145   iterator ret_it = end();
 146
 147   cond_dtor<size_type> cd(a_values, target_it, m_size - 1);
 148
 149   _GLIBCXX_DEBUG_ONLY(size_type cnt = 0;)
 150
 151   while (source_it != source_end_it)
 152     {
 153       if (source_it != it)
 154         {
 155           _GLIBCXX_DEBUG_ONLY(++cnt;)
 156           _GLIBCXX_DEBUG_ASSERT(cnt != m_size);
 157           new (const_cast<void*>(static_cast<const void*>(target_it)))
 158               value_type(*source_it);
 159
 160           ++target_it;
 161         }
 162       else
 163         ret_it = target_it;
 164     ++source_it;
 165     }
 166
 167   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
 168   reallocate_metadata((node_update*)this, m_size - 1);
 169   cd.set_no_action();
 170   _GLIBCXX_DEBUG_ONLY(debug_base::erase_existing(PB_DS_V2F(*it));)
 171   {
 172     cond_dtor<size_type> cd1(m_a_values, m_end_it, m_size);
 173   }
 174
 175   m_a_values = a_values;
 176   --m_size;
 177   m_end_it = m_a_values + m_size;
 178   update(node_begin(), (node_update*)this);
 179   PB_DS_ASSERT_VALID((*this))
 180   return It(ret_it);
 181 }
 182
 183 PB_DS_CLASS_T_DEC
 184 bool
 185 PB_DS_CLASS_C_DEC::
 186 erase(key_const_reference r_key)
 187 {
 188   point_iterator it = find(r_key);
 189   if (it == end())
 190     return false;
 191   erase(it);
 192   return true;
 193 }
 194 #endif