libstdc++-v3/include/ext/pb_ds/detail/gp_hash_table_map_/resize_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 resize_fn_imps.hpp
  44  * Contains implementations of gp_ht_map_'s resize related functions.
  45  */
  46
  47 PB_DS_CLASS_T_DEC
  48 inline bool
  49 PB_DS_CLASS_C_DEC::
  50 do_resize_if_needed()
  51 {
  52   if (!resize_base::is_resize_needed())
  53     return (false);
  54
  55   resize_imp(resize_base::get_new_size(        m_num_e, m_num_used_e));
  56
  57   return (true);
  58 }
  59
  60 PB_DS_CLASS_T_DEC
  61 void
  62 PB_DS_CLASS_C_DEC::
  63 do_resize(size_type size)
  64 {
  65   resize_imp(resize_base::get_nearest_larger_size(
  66                                                   size));
  67 }
  68
  69 PB_DS_CLASS_T_DEC
  70 inline void
  71 PB_DS_CLASS_C_DEC::
  72 do_resize_if_needed_no_throw()
  73 {
  74   if (!resize_base::is_resize_needed())
  75     return;
  76
  77   try
  78     {
  79       resize_imp(resize_base::get_new_size(            m_num_e, m_num_used_e));
  80     }
  81   catch(...)
  82     { }
  83
  84   PB_DS_DBG_ONLY(assert_valid();)
  85     }
  86
  87 PB_DS_CLASS_T_DEC
  88 void
  89 PB_DS_CLASS_C_DEC::
  90 resize_imp(size_type new_size)
  91 {
  92 #ifdef PB_DS_REGRESSION
  93   typename Allocator::group_throw_prob_adjustor adjust(m_num_e);
  94 #endif // #ifdef PB_DS_REGRESSION
  95
  96   if (new_size == m_num_e)
  97     return;
  98
  99   PB_DS_DBG_ONLY(assert_valid();)
 100
 101     const size_type old_size = m_num_e;
 102
 103   entry_array a_entries_resized = NULL;
 104
 105   // Following line might throw an exception.
 106
 107   a_entries_resized = s_entry_allocator.allocate(new_size);
 108
 109   ranged_probe_fn_base::notify_resized(new_size);
 110
 111   m_num_e = new_size;
 112
 113   for (size_type i = 0; i < m_num_e; ++i)
 114     a_entries_resized[i].m_stat = empty_entry_status;
 115
 116   try
 117     {
 118       resize_imp(a_entries_resized, old_size);
 119     }
 120   catch(...)
 121     {
 122       erase_all_valid_entries(a_entries_resized, new_size);
 123
 124       m_num_e = old_size;
 125
 126       s_entry_allocator.deallocate(a_entries_resized, new_size);
 127
 128       ranged_probe_fn_base::notify_resized(old_size);
 129
 130       throw;
 131     }
 132
 133   // At this point no exceptions can be thrown.
 134
 135   PB_DS_DBG_ONLY(assert_entry_array_valid(a_entries_resized, traits_base::m_store_extra_indicator);)
 136
 137     Resize_Policy::notify_resized(new_size);
 138
 139   erase_all_valid_entries(m_a_entries, old_size);
 140
 141   s_entry_allocator.deallocate(m_a_entries, old_size);
 142
 143   m_a_entries = a_entries_resized;
 144
 145   PB_DS_DBG_ONLY(assert_valid();)
 146     }
 147
 148 PB_DS_CLASS_T_DEC
 149 void
 150 PB_DS_CLASS_C_DEC::
 151 resize_imp(entry_array a_entries_resized, size_type old_size)
 152 {
 153   for (size_type pos = 0; pos < old_size; ++pos)
 154     if (m_a_entries[pos].m_stat == valid_entry_status)
 155       resize_imp_reassign(m_a_entries + pos,  a_entries_resized,  traits_base::m_store_extra_indicator);
 156 }
 157
 158 #include <ext/pb_ds/detail/gp_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
 159 #include <ext/pb_ds/detail/gp_hash_table_map_/resize_store_hash_fn_imps.hpp>
 160