libstdc++

cc_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 cc_hash_table_map_/resize_fn_imps.hpp
38 * Contains implementations of cc_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 len)
56 { resize_imp(resize_base::get_nearest_larger_size(len)); }
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 PB_DS_ASSERT_VALID((*this))
82 if (new_size == m_num_e)
83 return;
84
85 const size_type old_size = m_num_e;
86 entry_pointer_array a_p_entries_resized;
87
88 // Following line might throw an exception.
89 ranged_hash_fn_base::notify_resized(new_size);
90
91 __try
92 {
93 // Following line might throw an exception.
94 a_p_entries_resized = s_entry_pointer_allocator.allocate(new_size);
95 m_num_e = new_size;
96 }
97 __catch(...)
98 {
99 ranged_hash_fn_base::notify_resized(old_size);
100 __throw_exception_again;
101 }
102
103 // At this point no exceptions can be thrown.
104 resize_imp_no_exceptions(new_size, a_p_entries_resized, old_size);
105 Resize_Policy::notify_resized(new_size);
106 PB_DS_ASSERT_VALID((*this))
107 }
108
109 PB_DS_CLASS_T_DEC
110 void
111 PB_DS_CLASS_C_DEC::
112 resize_imp_no_exceptions(size_type new_size, entry_pointer_array a_p_entries_resized, size_type old_size)
113 {
114 std::fill(a_p_entries_resized, a_p_entries_resized + m_num_e,
115 entry_pointer(0));
116
117 for (size_type pos = 0; pos < old_size; ++pos)
118 {
119 entry_pointer p_e = m_entries[pos];
120 while (p_e != 0)
121 p_e = resize_imp_no_exceptions_reassign_pointer(p_e, a_p_entries_resized, traits_base::m_store_extra_indicator);
122 }
123
124 m_num_e = new_size;
125 _GLIBCXX_DEBUG_ONLY(assert_entry_pointer_array_valid(a_p_entries_resized,
126 __FILE__, __LINE__);)
127 s_entry_pointer_allocator.deallocate(m_entries, old_size);
128 m_entries = a_p_entries_resized;
129 PB_DS_ASSERT_VALID((*this))
130 }
131
132 #include <ext/pb_ds/detail/cc_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
133 #include <ext/pb_ds/detail/cc_hash_table_map_/resize_store_hash_fn_imps.hpp>
134