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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2016 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 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 _Alloc::group_adjustor adjust(m_size);
  74 #endif
  75
  76   size_type new_size = 0;
  77   size_type num_val_ersd = 0;
  78
  79   for (iterator source_it = begin(); source_it != m_end_it; ++source_it)
  80     if (!pred(*source_it))
  81       ++new_size;
  82     else
  83       ++num_val_ersd;
  84
  85   if (new_size == 0)
  86     {
  87       clear();
  88       return num_val_ersd;
  89     }
  90
  91   value_vector a_new_values = s_value_alloc.allocate(new_size);
  92   iterator target_it = a_new_values;
  93   cond_dtor<size_type> cd(a_new_values, target_it, new_size);
  94   _GLIBCXX_DEBUG_ONLY(debug_base::clear());
  95   for (iterator source_it = begin(); source_it != m_end_it; ++source_it)
  96     {
  97       if (!pred(*source_it))
  98         {
  99           new (const_cast<void*>(static_cast<const void*>(target_it)))
 100             value_type(*source_it);
 101
 102           _GLIBCXX_DEBUG_ONLY(debug_base::insert_new(PB_DS_V2F(*source_it)));
 103           ++target_it;
 104         }
 105     }
 106
 107   reallocate_metadata((node_update*)this, new_size);
 108   cd.set_no_action();
 109
 110   {
 111     cond_dtor<size_type> cd1(m_a_values, m_end_it, m_size);
 112   }
 113
 114   m_a_values = a_new_values;
 115   m_size = new_size;
 116   m_end_it = target_it;
 117   update(node_begin(), (node_update*)this);
 118   PB_DS_ASSERT_VALID((*this))
 119   return num_val_ersd;
 120 }
 121
 122 PB_DS_CLASS_T_DEC
 123 template<typename It>
 124 It
 125 PB_DS_CLASS_C_DEC::
 126 erase_imp(It it)
 127 {
 128   PB_DS_ASSERT_VALID((*this))
 129   if (it == end())
 130     return end();
 131
 132   PB_DS_CHECK_KEY_EXISTS(PB_DS_V2F(*it))
 133
 134 #ifdef PB_DS_REGRESSION
 135     typename _Alloc::group_adjustor adjust(m_size);
 136 #endif
 137
 138   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
 139   value_vector a_values = s_value_alloc.allocate(m_size - 1);
 140   iterator source_it = begin();
 141   iterator source_end_it = end();
 142   iterator target_it = a_values;
 143   iterator ret_it = end();
 144
 145   cond_dtor<size_type> cd(a_values, target_it, m_size - 1);
 146
 147   _GLIBCXX_DEBUG_ONLY(size_type cnt = 0;)
 148
 149   while (source_it != source_end_it)
 150     {
 151       if (source_it != it)
 152         {
 153           _GLIBCXX_DEBUG_ONLY(++cnt;)
 154           _GLIBCXX_DEBUG_ASSERT(cnt != m_size);
 155           new (const_cast<void*>(static_cast<const void*>(target_it)))
 156               value_type(*source_it);
 157
 158           ++target_it;
 159         }
 160       else
 161         ret_it = target_it;
 162     ++source_it;
 163     }
 164
 165   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
 166   reallocate_metadata((node_update*)this, m_size - 1);
 167   cd.set_no_action();
 168   _GLIBCXX_DEBUG_ONLY(debug_base::erase_existing(PB_DS_V2F(*it));)
 169   {
 170     cond_dtor<size_type> cd1(m_a_values, m_end_it, m_size);
 171   }
 172
 173   m_a_values = a_values;
 174   --m_size;
 175   m_end_it = m_a_values + m_size;
 176   update(node_begin(), (node_update*)this);
 177   PB_DS_ASSERT_VALID((*this))
 178   return It(ret_it);
 179 }
 180
 181 PB_DS_CLASS_T_DEC
 182 bool
 183 PB_DS_CLASS_C_DEC::
 184 erase(key_const_reference r_key)
 185 {
 186   point_iterator it = find(r_key);
 187   if (it == end())
 188     return false;
 189   erase(it);
 190   return true;
 191 }