libstdc++

gp_hash_table_map_/resize_fn_imps.hpp
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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
41 PB_DS_CLASS_T_DEC
42 inline bool
43 PB_DS_CLASS_C_DEC::
44 do_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
52 PB_DS_CLASS_T_DEC
53 void
54 PB_DS_CLASS_C_DEC::
55 do_resize(size_type n)
56 { resize_imp(resize_base::get_nearest_larger_size(n)); }
57
58 PB_DS_CLASS_T_DEC
59 inline void
60 PB_DS_CLASS_C_DEC::
61 do_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
76 PB_DS_CLASS_T_DEC
77 void
78 PB_DS_CLASS_C_DEC::
79 resize_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
126 PB_DS_CLASS_T_DEC
127 void
128 PB_DS_CLASS_C_DEC::
129 resize_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