resize_fn_imps.hpp revision 1.1.1.2 
1// -*- C++ -*-
2
3// Copyright (C) 2005-2013 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
41PB_DS_CLASS_T_DEC
42inline bool
43PB_DS_CLASS_C_DEC::
44do_resize_if_needed()
45{
46  if (!resize_base::is_resize_needed())
47    return false;
48  resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
49  return true;
50}
51
52PB_DS_CLASS_T_DEC
53void
54PB_DS_CLASS_C_DEC::
55do_resize(size_type n)
56{ resize_imp(resize_base::get_nearest_larger_size(n)); }
57
58PB_DS_CLASS_T_DEC
59inline void
60PB_DS_CLASS_C_DEC::
61do_resize_if_needed_no_throw()
62{
63  if (!resize_base::is_resize_needed())
64    return;
65
66  __try
67    {
68      resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
69    }
70  __catch(...)
71    { }
72
73  PB_DS_ASSERT_VALID((*this))
74}
75
76PB_DS_CLASS_T_DEC
77void
78PB_DS_CLASS_C_DEC::
79resize_imp(size_type new_size)
80{
81#ifdef PB_DS_REGRESSION
82  typename _Alloc::group_adjustor adjust(m_num_e);
83#endif
84
85  if (new_size == m_num_e)
86    return;
87
88  PB_DS_ASSERT_VALID((*this))
89  const size_type old_size = m_num_e;
90  entry_array a_entries_resized = 0;
91
92  // Following line might throw an exception.
93  a_entries_resized = s_entry_allocator.allocate(new_size);
94
95  ranged_probe_fn_base::notify_resized(new_size);
96  m_num_e = new_size;
97
98  for (size_type i = 0; i < m_num_e; ++i)
99    a_entries_resized[i].m_stat = empty_entry_status;
100
101  __try
102    {
103      resize_imp(a_entries_resized, old_size);
104    }
105  __catch(...)
106    {
107      erase_all_valid_entries(a_entries_resized, new_size);
108      m_num_e = old_size;
109      s_entry_allocator.deallocate(a_entries_resized, new_size);
110      ranged_probe_fn_base::notify_resized(old_size);
111      __throw_exception_again;
112    }
113
114  // At this point no exceptions can be thrown.
115  _GLIBCXX_DEBUG_ONLY(assert_entry_array_valid(a_entries_resized,
116					       traits_base::m_store_extra_indicator,
117					       __FILE__, __LINE__);)
118
119  Resize_Policy::notify_resized(new_size);
120  erase_all_valid_entries(m_entries, old_size);
121  s_entry_allocator.deallocate(m_entries, old_size);
122  m_entries = a_entries_resized;
123  PB_DS_ASSERT_VALID((*this))
124}
125
126PB_DS_CLASS_T_DEC
127void
128PB_DS_CLASS_C_DEC::
129resize_imp(entry_array a_entries_resized, size_type old_size)
130{
131  for (size_type pos = 0; pos < old_size; ++pos)
132    if (m_entries[pos].m_stat == valid_entry_status)
133      resize_imp_reassign(m_entries + pos, a_entries_resized,
134			  traits_base::m_store_extra_indicator);
135}
136
137#include <ext/pb_ds/detail/gp_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
138#include <ext/pb_ds/detail/gp_hash_table_map_/resize_store_hash_fn_imps.hpp>
139
140