resize_fn_imps.hpp revision 169692 
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.
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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
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40// warranty.
41
42/**
43 * @file resize_fn_imps.hpp
44 * Contains implementations of gp_ht_map_'s resize related functions.
45 */
46
47PB_DS_CLASS_T_DEC
48inline bool
49PB_DS_CLASS_C_DEC::
50do_resize_if_needed()
51{
52  if (!resize_base::is_resize_needed())
53    return false;
54  resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
55  return true;
56}
57
58PB_DS_CLASS_T_DEC
59void
60PB_DS_CLASS_C_DEC::
61do_resize(size_type n)
62{ resize_imp(resize_base::get_nearest_larger_size(n)); }
63
64PB_DS_CLASS_T_DEC
65inline void
66PB_DS_CLASS_C_DEC::
67do_resize_if_needed_no_throw()
68{
69  if (!resize_base::is_resize_needed())
70    return;
71
72  try
73    {
74      resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
75    }
76  catch(...)
77    { }
78
79  _GLIBCXX_DEBUG_ONLY(assert_valid();)
80}
81
82PB_DS_CLASS_T_DEC
83void
84PB_DS_CLASS_C_DEC::
85resize_imp(size_type new_size)
86{
87#ifdef PB_DS_REGRESSION
88  typename Allocator::group_throw_prob_adjustor adjust(m_num_e);
89#endif
90
91  if (new_size == m_num_e)
92    return;
93
94  _GLIBCXX_DEBUG_ONLY(assert_valid();)
95  const size_type old_size = m_num_e;
96  entry_array a_entries_resized = NULL;
97
98  // Following line might throw an exception.
99  a_entries_resized = s_entry_allocator.allocate(new_size);
100
101  ranged_probe_fn_base::notify_resized(new_size);
102  m_num_e = new_size;
103
104  for (size_type i = 0; i < m_num_e; ++i)
105    a_entries_resized[i].m_stat = empty_entry_status;
106
107  try
108    {
109      resize_imp(a_entries_resized, old_size);
110    }
111  catch(...)
112    {
113      erase_all_valid_entries(a_entries_resized, new_size);
114      m_num_e = old_size;
115      s_entry_allocator.deallocate(a_entries_resized, new_size);
116      ranged_probe_fn_base::notify_resized(old_size);
117      __throw_exception_again;
118    }
119
120  // At this point no exceptions can be thrown.
121  _GLIBCXX_DEBUG_ONLY(assert_entry_array_valid(a_entries_resized, traits_base::m_store_extra_indicator);)
122
123  Resize_Policy::notify_resized(new_size);
124  erase_all_valid_entries(m_entries, old_size);
125  s_entry_allocator.deallocate(m_entries, old_size);
126  m_entries = a_entries_resized;
127  _GLIBCXX_DEBUG_ONLY(assert_valid();)
128}
129
130PB_DS_CLASS_T_DEC
131void
132PB_DS_CLASS_C_DEC::
133resize_imp(entry_array a_entries_resized, size_type old_size)
134{
135  for (size_type pos = 0; pos < old_size; ++pos)
136    if (m_entries[pos].m_stat == valid_entry_status)
137      resize_imp_reassign(m_entries + pos, a_entries_resized,
138			  traits_base::m_store_extra_indicator);
139}
140
141#include <ext/pb_ds/detail/gp_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
142#include <ext/pb_ds/detail/gp_hash_table_map_/resize_store_hash_fn_imps.hpp>
143
144