libstdc++

cond_dealtor.hpp
Go to the documentation of this file.
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 detail/cond_dealtor.hpp
38 * Contains a conditional deallocator.
39 */
40
41 #ifndef PB_DS_COND_DEALTOR_HPP
42 #define PB_DS_COND_DEALTOR_HPP
43
44 namespace __gnu_pbds
45 {
46 namespace detail
47 {
48 /// Conditional deallocate constructor argument.
49 template<typename Entry, typename _Alloc>
50 class cond_dealtor
51 {
52 typedef typename _Alloc::template rebind<Entry> __rebind_e;
53
54 public:
55 typedef typename __rebind_e::other entry_allocator;
56 typedef typename entry_allocator::pointer entry_pointer;
57
58 cond_dealtor(entry_pointer p_e)
59 : m_p_e(p_e), m_no_action_destructor(false) { }
60
61 ~cond_dealtor()
62 {
63 if (m_no_action_destructor)
64 return;
65 s_alloc.deallocate(m_p_e, 1);
66 }
67
68 void
69 set_no_action()
70 { m_no_action_destructor = true; }
71
72 private:
73 entry_pointer m_p_e;
74 bool m_no_action_destructor;
75 static entry_allocator s_alloc;
76 };
77
78 template<typename Entry, class _Alloc>
79 typename cond_dealtor<Entry, _Alloc>::entry_allocator
80 cond_dealtor<Entry, _Alloc>::s_alloc;
81 } // namespace detail
82 } // namespace __gnu_pbds
83
84 #endif // #ifndef PB_DS_COND_DEALTOR_HPP