libstdc++
cond_dealtor.hpp
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1 // -*- C++ -*-
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3 // Copyright (C) 2005-2015 Free Software Foundation, Inc.
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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 namespace __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 
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
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.