libstdc++-v3/include/ext/pb_ds/detail/gp_hash_table_map_/erase_store_hash_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 erase_store_hash_fn_imps.hpp
  44  * Contains implementations of gp_ht_map_'s erase related functions, when the hash
  45  *    value is stored.
  46  */
  47
  48 PB_DS_CLASS_T_DEC
  49 inline bool
  50 PB_DS_CLASS_C_DEC::
  51 erase_imp(const_key_reference r_key,  true_type)
  52 {
  53   const comp_hash pos_hash_pair =
  54     ranged_probe_fn_base::operator()(r_key);
  55
  56   size_type i;
  57
  58   resize_base::notify_erase_search_start();
  59
  60   for (i = 0; i < m_num_e; ++i)
  61     {
  62       const size_type pos = ranged_probe_fn_base::operator()(            r_key, pos_hash_pair.second, i);
  63
  64       entry* const p_e = m_entries + pos;
  65
  66       switch(p_e->m_stat)
  67         {
  68         case empty_entry_status:
  69           {
  70             resize_base::notify_erase_search_end();
  71
  72             _GLIBCXX_DEBUG_ONLY(map_debug_base::check_key_does_not_exist(
  73                                                                     r_key));
  74
  75             return (false);
  76           }
  77           break;
  78         case valid_entry_status:
  79           if (hash_eq_fn_base::operator()(
  80                                           PB_DS_V2F(p_e->m_value),
  81                                           p_e->m_hash,
  82                                           r_key,
  83                                           pos_hash_pair.second))
  84             {
  85               resize_base::notify_erase_search_end();
  86
  87               erase_entry(p_e);
  88
  89               do_resize_if_needed_no_throw();
  90
  91               return (true);
  92             }
  93           break;
  94         case erased_entry_status:
  95           break;
  96         default:
  97           _GLIBCXX_DEBUG_ASSERT(0);
  98         };
  99
 100       resize_base::notify_erase_search_collision();
 101     }
 102
 103   resize_base::notify_erase_search_end();
 104
 105   return (false);
 106 }
 107