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.
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 // 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
37 // of the above authors, nor IBM Haifa Research Laboratories, make any
38 // representation about the suitability of this software for any
39 // purpose. It is provided "as is" without express or implied
40 // warranty.
41
42 /**
43 * @file resize_fn_imps.hpp
44 * Contains implementations of cc_ht_map_'s resize related functions.
45 */
46
47 PB_DS_CLASS_T_DEC
48 inline bool
49 PB_DS_CLASS_C_DEC::
do_resize_if_needed()50 do_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
58 PB_DS_CLASS_T_DEC
59 void
60 PB_DS_CLASS_C_DEC::
do_resize(size_type len)61 do_resize(size_type len)
62 { resize_imp(resize_base::get_nearest_larger_size(len)); }
63
64 PB_DS_CLASS_T_DEC
65 inline void
66 PB_DS_CLASS_C_DEC::
do_resize_if_needed_no_throw()67 do_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
82 PB_DS_CLASS_T_DEC
83 void
84 PB_DS_CLASS_C_DEC::
resize_imp(size_type new_size)85 resize_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
115 PB_DS_CLASS_T_DEC
116 void
117 PB_DS_CLASS_C_DEC::
resize_imp_no_exceptions(size_type new_size,entry_pointer_array a_p_entries_resized,size_type old_size)118 resize_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