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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2009, 2010, 2011 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 erase_fn_imps.hpp
  38  * Contains an implementation class for ov_tree_.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 void
  43 PB_DS_CLASS_C_DEC::
  44 clear()
  45 {
  46   PB_DS_ASSERT_VALID((*this))
  47   if (m_size == 0)
  48     {
  49       return;
  50     }
  51   else
  52     {
  53       reallocate_metadata((node_update* )this, 0);
  54       cond_dtor<size_type> cd(m_a_values, m_end_it, m_size);
  55     }
  56
  57   _GLIBCXX_DEBUG_ONLY(debug_base::clear();)
  58   m_a_values = 0;
  59   m_size = 0;
  60   m_end_it = m_a_values;
  61   PB_DS_ASSERT_VALID((*this))
  62 }
  63
  64 PB_DS_CLASS_T_DEC
  65 template<typename Pred>
  66 inline typename PB_DS_CLASS_C_DEC::size_type
  67 PB_DS_CLASS_C_DEC::
  68 erase_if(Pred pred)
  69 {
  70   PB_DS_ASSERT_VALID((*this))
  71
  72 #ifdef PB_DS_REGRESSION
  73     typename Allocator::group_adjustor adjust(m_size);
  74 #endif
  75
  76   size_type new_size = 0;
  77   size_type num_val_ersd = 0;
  78   for (iterator source_it = begin(); source_it != m_end_it; ++source_it)
  79     if (!pred(*source_it))
  80       ++new_size;
  81     else
  82       ++num_val_ersd;
  83
  84   if (new_size == 0)
  85     {
  86       clear();
  87       return num_val_ersd;
  88     }
  89
  90   value_vector a_new_values = s_value_alloc.allocate(new_size);
  91   iterator target_it = a_new_values;
  92   cond_dtor<size_type> cd(a_new_values, target_it, new_size);
  93   _GLIBCXX_DEBUG_ONLY(debug_base::clear());
  94   for (iterator source_it = begin(); source_it != m_end_it; ++source_it)
  95     {
  96       if (!pred(*source_it))
  97         {
  98           new (const_cast<void*>(static_cast<const void* >(target_it)))
  99             value_type(*source_it);
 100
 101           _GLIBCXX_DEBUG_ONLY(debug_base::insert_new(PB_DS_V2F(*source_it)));
 102           ++target_it;
 103         }
 104     }
 105
 106   reallocate_metadata((node_update* )this, new_size);
 107   cd.set_no_action();
 108
 109   {
 110     cond_dtor<size_type> cd1(m_a_values, m_end_it, m_size);
 111   }
 112
 113   m_a_values = a_new_values;
 114   m_size = new_size;
 115   m_end_it = target_it;
 116   update(node_begin(), (node_update* )this);
 117   PB_DS_ASSERT_VALID((*this))
 118   return num_val_ersd;
 119 }
 120
 121 PB_DS_CLASS_T_DEC
 122 template<typename It>
 123 It
 124 PB_DS_CLASS_C_DEC::
 125 erase_imp(It it)
 126 {
 127   PB_DS_ASSERT_VALID((*this))
 128   if (it == end())
 129     return end();
 130
 131   PB_DS_CHECK_KEY_EXISTS(PB_DS_V2F(*it))
 132
 133 #ifdef PB_DS_REGRESSION
 134     typename Allocator::group_adjustor adjust(m_size);
 135 #endif
 136
 137   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
 138   value_vector a_values = s_value_alloc.allocate(m_size - 1);
 139   iterator source_it = begin();
 140   iterator source_end_it = end();
 141   iterator target_it = a_values;
 142   iterator ret_it = end();
 143
 144   cond_dtor<size_type> cd(a_values, target_it, m_size - 1);
 145
 146   _GLIBCXX_DEBUG_ONLY(size_type cnt = 0;)
 147
 148   while (source_it != source_end_it)
 149     {
 150       if (source_it != it)
 151         {
 152           _GLIBCXX_DEBUG_ONLY(++cnt;)
 153           _GLIBCXX_DEBUG_ASSERT(cnt != m_size);
 154           new (const_cast<void* >(static_cast<const void* >(target_it)))
 155               value_type(*source_it);
 156
 157           ++target_it;
 158         }
 159       else
 160         ret_it = target_it;
 161     ++source_it;
 162     }
 163
 164   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
 165   reallocate_metadata((node_update* )this, m_size - 1);
 166   cd.set_no_action();
 167   _GLIBCXX_DEBUG_ONLY(PB_DS_CLASS_C_DEC::erase_existing(PB_DS_V2F(*it));)
 168   {
 169     cond_dtor<size_type> cd1(m_a_values, m_end_it, m_size);
 170   }
 171
 172   m_a_values = a_values;
 173   --m_size;
 174   m_end_it = m_a_values + m_size;
 175   update(node_begin(), (node_update* )this);
 176   PB_DS_ASSERT_VALID((*this))
 177   return It(ret_it);
 178 }
 179
 180 PB_DS_CLASS_T_DEC
 181 bool
 182 PB_DS_CLASS_C_DEC::
 183 erase(const_key_reference r_key)
 184 {
 185   point_iterator it = find(r_key);
 186   if (it == end())
 187     return false;
 188   erase(it);
 189   return true;
 190 }
 191