resize_fn_imps.hpp revision 169691 
11900Swollman// -*- C++ -*-
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31900Swollman// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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674848Sru// software; you can redistribute it and/or modify it under the terms
71900Swollman// of the GNU General Public License as published by the Free Software
8160748Syar// Foundation; either version 2, or (at your option) any later
91900Swollman// version.
101900Swollman
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
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26// resulting executable to be covered by the GNU General Public
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28// reasons why the executable file might be covered by the GNU General
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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
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41
42/**
43 * @file resize_fn_imps.hpp
44 * Contains implementations of cc_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 len)
62{ resize_imp(resize_base::get_nearest_larger_size(len)); }
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  _GLIBCXX_DEBUG_ONLY(assert_valid();)
88  if (new_size == m_num_e)
89    return;
90
91  const size_type old_size = m_num_e;
92  entry_pointer_array a_p_entries_resized;
93
94  // Following line might throw an exception.
95  ranged_hash_fn_base::notify_resized(new_size);
96
97  try
98    {
99      // Following line might throw an exception.
100      a_p_entries_resized = s_entry_pointer_allocator.allocate(new_size);
101      m_num_e = new_size;
102    }
103  catch(...)
104    {
105      ranged_hash_fn_base::notify_resized(old_size);
106      __throw_exception_again;
107    }
108
109  // At this point no exceptions can be thrown.
110  resize_imp_no_exceptions(new_size, a_p_entries_resized, old_size);
111  Resize_Policy::notify_resized(new_size);
112  _GLIBCXX_DEBUG_ONLY(assert_valid();)
113}
114
115PB_DS_CLASS_T_DEC
116void
117PB_DS_CLASS_C_DEC::
118resize_imp_no_exceptions(size_type new_size, entry_pointer_array a_p_entries_resized, size_type old_size)
119{
120  std::fill(a_p_entries_resized, a_p_entries_resized + m_num_e,
121	    entry_pointer(NULL));
122
123  for (size_type pos = 0; pos < old_size; ++pos)
124    {
125      entry_pointer p_e = m_entries[pos];
126      while (p_e != NULL)
127	p_e = resize_imp_no_exceptions_reassign_pointer(p_e, a_p_entries_resized,  traits_base::m_store_extra_indicator);
128    }
129
130  m_num_e = new_size;
131  _GLIBCXX_DEBUG_ONLY(assert_entry_pointer_array_valid(a_p_entries_resized);)
132  s_entry_pointer_allocator.deallocate(m_entries, old_size);
133  m_entries = a_p_entries_resized;
134  _GLIBCXX_DEBUG_ONLY(assert_valid();)
135}
136
137#include <ext/pb_ds/detail/cc_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
138#include <ext/pb_ds/detail/cc_hash_table_map_/resize_store_hash_fn_imps.hpp>
139
140