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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the terms
   8 // of the GNU General Public License as published by the Free Software
   9 // Foundation; either version 3, or (at your option) any later
  10 // version.
  11
  12 // This library is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  27
  28 // Permission to use, copy, modify, sell, and distribute this software
  29 // is hereby granted without fee, provided that the above copyright
  30 // notice appears in all copies, and that both that copyright notice
  31 // and this permission notice appear in supporting documentation. None
  32 // of the above authors, nor IBM Haifa Research Laboratories, make any
  33 // representation about the suitability of this software for any
  34 // purpose. It is provided "as is" without express or implied
  35 // warranty.
  36
  37 /**
  38  * @file resize_fn_imps.hpp
  39  * Contains implementations of gp_ht_map_'s resize related functions.
  40  */
  41
  42 PB_DS_CLASS_T_DEC
  43 inline bool
  44 PB_DS_CLASS_C_DEC::
  45 do_resize_if_needed()
  46 {
  47   if (!resize_base::is_resize_needed())
  48     return false;
  49   resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
  50   return true;
  51 }
  52
  53 PB_DS_CLASS_T_DEC
  54 void
  55 PB_DS_CLASS_C_DEC::
  56 do_resize(size_type n)
  57 { resize_imp(resize_base::get_nearest_larger_size(n)); }
  58
  59 PB_DS_CLASS_T_DEC
  60 inline void
  61 PB_DS_CLASS_C_DEC::
  62 do_resize_if_needed_no_throw()
  63 {
  64   if (!resize_base::is_resize_needed())
  65     return;
  66
  67   __try
  68     {
  69       resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
  70     }
  71   __catch(...)
  72     { }
  73
  74   PB_DS_ASSERT_VALID((*this))
  75 }
  76
  77 PB_DS_CLASS_T_DEC
  78 void
  79 PB_DS_CLASS_C_DEC::
  80 resize_imp(size_type new_size)
  81 {
  82 #ifdef PB_DS_REGRESSION
  83   typename Allocator::group_adjustor adjust(m_num_e);
  84 #endif
  85
  86   if (new_size == m_num_e)
  87     return;
  88
  89   PB_DS_ASSERT_VALID((*this))
  90   const size_type old_size = m_num_e;
  91   entry_array a_entries_resized = 0;
  92
  93   // Following line might throw an exception.
  94   a_entries_resized = s_entry_allocator.allocate(new_size);
  95
  96   ranged_probe_fn_base::notify_resized(new_size);
  97   m_num_e = new_size;
  98
  99   for (size_type i = 0; i < m_num_e; ++i)
 100     a_entries_resized[i].m_stat = empty_entry_status;
 101
 102   __try
 103     {
 104       resize_imp(a_entries_resized, old_size);
 105     }
 106   __catch(...)
 107     {
 108       erase_all_valid_entries(a_entries_resized, new_size);
 109       m_num_e = old_size;
 110       s_entry_allocator.deallocate(a_entries_resized, new_size);
 111       ranged_probe_fn_base::notify_resized(old_size);
 112       __throw_exception_again;
 113     }
 114
 115   // At this point no exceptions can be thrown.
 116   _GLIBCXX_DEBUG_ONLY(assert_entry_array_valid(a_entries_resized,
 117                                                traits_base::m_store_extra_indicator,
 118                                                __FILE__, __LINE__);)
 119
 120   Resize_Policy::notify_resized(new_size);
 121   erase_all_valid_entries(m_entries, old_size);
 122   s_entry_allocator.deallocate(m_entries, old_size);
 123   m_entries = a_entries_resized;
 124   PB_DS_ASSERT_VALID((*this))
 125 }
 126
 127 PB_DS_CLASS_T_DEC
 128 void
 129 PB_DS_CLASS_C_DEC::
 130 resize_imp(entry_array a_entries_resized, size_type old_size)
 131 {
 132   for (size_type pos = 0; pos < old_size; ++pos)
 133     if (m_entries[pos].m_stat == valid_entry_status)
 134       resize_imp_reassign(m_entries + pos, a_entries_resized,
 135                           traits_base::m_store_extra_indicator);
 136 }
 137
 138 #include <ext/pb_ds/detail/gp_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
 139 #include <ext/pb_ds/detail/gp_hash_table_map_/resize_store_hash_fn_imps.hpp>
 140