libstdc++
cond_dealtor.hpp
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1// -*- C++ -*-
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3// Copyright (C) 2005-2019 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
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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.
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11// This library is distributed in the hope that it will be useful, but
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13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14// General Public License for more details.
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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.
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25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
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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
44namespace __gnu_pbds
45{
46 namespace detail
47 {
48 /// Conditional deallocate constructor argument.
49 template<typename Entry, typename _Alloc>
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
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
81 } // namespace detail
82} // namespace __gnu_pbds
83
84#endif // #ifndef PB_DS_COND_DEALTOR_HPP
GNU extensions for policy-based data structures for public use.
Conditional deallocate constructor argument.