libstdc++

cond_key_dtor_entry_dealtor.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_/cond_key_dtor_entry_dealtor.hpp
38 * Contains a conditional key destructor, used for exception handling.
39 */
40
41 namespace __gnu_pbds
42 {
43 namespace detail
44 {
45 /// Conditional dey destructor, cc_hash.
46 template<typename HT_Map>
47 class cond_dealtor
48 {
49 public:
50 typedef typename HT_Map::entry entry;
51 typedef typename HT_Map::entry_allocator entry_allocator;
52 typedef typename HT_Map::key_type key_type;
53
54 cond_dealtor(entry_allocator* p_a, entry* p_e)
55 : m_p_a(p_a), m_p_e(p_e), m_key_destruct(false),
56 m_no_action_destructor(false)
57 { }
58
59 inline
60 ~cond_dealtor();
61
62 void
63 set_key_destruct()
64 { m_key_destruct = true; }
65
66 void
67 set_no_action_destructor()
68 { m_no_action_destructor = true; }
69
70 protected:
71 entry_allocator* const m_p_a;
72 entry* const m_p_e;
73
74 bool m_key_destruct;
75 bool m_no_action_destructor;
76 };
77
78 template<typename HT_Map>
79 inline
80 cond_dealtor<HT_Map>::
81 ~cond_dealtor()
82 {
83 if (m_no_action_destructor)
84 return;
85 if (m_key_destruct)
86 m_p_e->m_value.first.~key_type();
87 m_p_a->deallocate(m_p_e, 1);
88 }
89 } // namespace detail
90 } // namespace __gnu_pbds