libstdc++: cond_dealtor.hpp Source File

libstdc++

cond_dealtor.hpp
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1// -*- C++ -*-
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3// Copyright (C) 2005-2026 Free Software Foundation, Inc.
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16// Under Section 7 of GPL version 3, you are granted additional
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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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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#include <ext/pb_ds/detail/types_traits.hpp>
45
46namespace __gnu_pbds
47{
48 namespace detail
49 {
50 /// Conditional deallocate constructor argument.
51 template<typename Entry, typename _Alloc>
52 class cond_dealtor
53 {
54 typedef rebind_traits<_Alloc, Entry> alloc_traits;
55
56 public:
57 typedef typename alloc_traits::allocator_type entry_allocator;
58 typedef typename alloc_traits::pointer entry_pointer;
59
60 cond_dealtor(entry_pointer p_e)
61 : m_p_e(p_e), m_no_action_destructor(false) { }
62
63 ~cond_dealtor()
64 {
65 if (m_no_action_destructor)
66 return;
67 s_alloc.deallocate(m_p_e, 1);
68 }
69
70 void
71 set_no_action()
72 { m_no_action_destructor = true; }
73
74 private:
75 entry_pointer m_p_e;
76 bool m_no_action_destructor;
77 static entry_allocator s_alloc;
78 };
79
80 template<typename Entry, class _Alloc>
81 typename cond_dealtor<Entry, _Alloc>::entry_allocator
82 cond_dealtor<Entry, _Alloc>::s_alloc;
83 } // namespace detail
84} // namespace __gnu_pbds
85
86#endif // #ifndef PB_DS_COND_DEALTOR_HPP
types_traits.hpp
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition assoc_container.hpp:52
__gnu_pbds::detail::rebind_traits
Consistent API for accessing allocator-related types.
Definition types_traits.hpp:140