libstdc++-v3/include/ext/pb_ds/detail/gp_hash_table_map_/resize_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2020 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 gp_hash_table_map_/resize_fn_imps.hpp
  38  * Contains implementations of gp_ht_map_'s resize related functions.
  39  */
  40
  41 #ifdef PB_DS_CLASS_C_DEC
  42
  43 PB_DS_CLASS_T_DEC
  44 inline bool
  45 PB_DS_CLASS_C_DEC::
  46 do_resize_if_needed()
  47 {
  48   if (!resize_base::is_resize_needed())
  49     return false;
  50   resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
  51   return true;
  52 }
  53
  54 PB_DS_CLASS_T_DEC
  55 void
  56 PB_DS_CLASS_C_DEC::
  57 do_resize(size_type n)
  58 { resize_imp(resize_base::get_nearest_larger_size(n)); }
  59
  60 PB_DS_CLASS_T_DEC
  61 inline void
  62 PB_DS_CLASS_C_DEC::
  63 do_resize_if_needed_no_throw()
  64 {
  65   if (!resize_base::is_resize_needed())
  66     return;
  67
  68   __try
  69     {
  70       resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
  71     }
  72   __catch(...)
  73     { }
  74
  75   PB_DS_ASSERT_VALID((*this))
  76 }
  77
  78 PB_DS_CLASS_T_DEC
  79 void
  80 PB_DS_CLASS_C_DEC::
  81 resize_imp(size_type new_size)
  82 {
  83 #ifdef PB_DS_REGRESSION
  84   typename _Alloc::group_adjustor adjust(m_num_e);
  85 #endif
  86
  87   if (new_size == m_num_e)
  88     return;
  89
  90   PB_DS_ASSERT_VALID((*this))
  91   const size_type old_size = m_num_e;
  92   entry_array a_entries_resized = 0;
  93
  94   // Following line might throw an exception.
  95   a_entries_resized = s_entry_allocator.allocate(new_size);
  96
  97   ranged_probe_fn_base::notify_resized(new_size);
  98   m_num_e = new_size;
  99
 100   for (size_type i = 0; i < m_num_e; ++i)
 101     a_entries_resized[i].m_stat = empty_entry_status;
 102
 103   __try
 104     {
 105       resize_imp(a_entries_resized, old_size);
 106     }
 107   __catch(...)
 108     {
 109       erase_all_valid_entries(a_entries_resized, new_size);
 110       m_num_e = old_size;
 111       s_entry_allocator.deallocate(a_entries_resized, new_size);
 112       ranged_probe_fn_base::notify_resized(old_size);
 113       __throw_exception_again;
 114     }
 115
 116   // At this point no exceptions can be thrown.
 117   _GLIBCXX_DEBUG_ONLY(assert_entry_array_valid(a_entries_resized,
 118                                                traits_base::m_store_extra_indicator,
 119                                                __FILE__, __LINE__);)
 120
 121   Resize_Policy::notify_resized(new_size);
 122   erase_all_valid_entries(m_entries, old_size);
 123   s_entry_allocator.deallocate(m_entries, old_size);
 124   m_entries = a_entries_resized;
 125   PB_DS_ASSERT_VALID((*this))
 126 }
 127
 128 PB_DS_CLASS_T_DEC
 129 void
 130 PB_DS_CLASS_C_DEC::
 131 resize_imp(entry_array a_entries_resized, size_type old_size)
 132 {
 133   for (size_type pos = 0; pos < old_size; ++pos)
 134     if (m_entries[pos].m_stat == valid_entry_status)
 135       resize_imp_reassign(m_entries + pos, a_entries_resized,
 136                           traits_base::m_store_extra_indicator);
 137 }
 138
 139 #include <ext/pb_ds/detail/gp_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
 140 #include <ext/pb_ds/detail/gp_hash_table_map_/resize_store_hash_fn_imps.hpp>
 141
 142 #endif