libstdc++-v3/include/ext/pb_ds/detail/cc_hash_table_map_/erase_no_store_hash_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2009 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_no_store_hash_fn_imps.hpp
  38  * Contains implementations of cc_ht_map_'s erase related functions,
  39  * when the hash value is not stored.
  40  */
  41
  42 PB_DS_CLASS_T_DEC
  43 inline bool
  44 PB_DS_CLASS_C_DEC::
  45 erase(const_key_reference r_key)
  46 {
  47   _GLIBCXX_DEBUG_ONLY(assert_valid();)
  48   return erase_in_pos_imp(r_key, ranged_hash_fn_base::operator()(r_key));
  49 }
  50
  51 PB_DS_CLASS_T_DEC
  52 inline bool
  53 PB_DS_CLASS_C_DEC::
  54 erase_in_pos_imp(const_key_reference r_key, size_type pos)
  55 {
  56   _GLIBCXX_DEBUG_ONLY(assert_valid();)
  57   entry_pointer p_e = m_entries[pos];
  58   resize_base::notify_erase_search_start();
  59   if (p_e == 0)
  60     {
  61       resize_base::notify_erase_search_end();
  62       _GLIBCXX_DEBUG_ONLY(debug_base::check_key_does_not_exist(r_key);)
  63       _GLIBCXX_DEBUG_ONLY(assert_valid();)
  64       return false;
  65     }
  66
  67   if (hash_eq_fn_base::operator()(PB_DS_V2F(p_e->m_value), r_key))
  68     {
  69       resize_base::notify_erase_search_end();
  70       _GLIBCXX_DEBUG_ONLY(debug_base:: check_key_exists(r_key);)
  71       erase_entry_pointer(m_entries[pos]);
  72       do_resize_if_needed_no_throw();
  73       _GLIBCXX_DEBUG_ONLY(assert_valid();)
  74       return true;
  75     }
  76
  77   while (true)
  78     {
  79       entry_pointer p_next_e = p_e->m_p_next;
  80       if (p_next_e == 0)
  81         {
  82           resize_base::notify_erase_search_end();
  83           _GLIBCXX_DEBUG_ONLY(debug_base::check_key_does_not_exist(r_key);)
  84           _GLIBCXX_DEBUG_ONLY(assert_valid();)
  85           return false;
  86         }
  87
  88       if (hash_eq_fn_base::operator()(PB_DS_V2F(p_next_e->m_value), r_key))
  89         {
  90           resize_base::notify_erase_search_end();
  91           _GLIBCXX_DEBUG_ONLY(debug_base::check_key_exists(r_key);)
  92           erase_entry_pointer(p_e->m_p_next);
  93           do_resize_if_needed_no_throw();
  94           _GLIBCXX_DEBUG_ONLY(assert_valid();)
  95           return true;
  96         }
  97       resize_base::notify_erase_search_collision();
  98       p_e = p_next_e;
  99     }
 100 }
 101