cond_dealtor.hpp revision 1.1.1.1 
1// -*- C++ -*-
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3// Copyright (C) 2005, 2006 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 2, 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
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.
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16// You should have received a copy of the GNU General Public License
17// along with this library; see the file COPYING.  If not, write to
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19// MA 02111-1307, USA.
20
21// As a special exception, you may use this file as part of a free
22// software library without restriction.  Specifically, if other files
23// instantiate templates or use macros or inline functions from this
24// file, or you compile this file and link it with other files to
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26// resulting executable to be covered by the GNU General Public
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28// reasons why the executable file might be covered by the GNU General
29// Public License.
30
31// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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33// Permission to use, copy, modify, sell, and distribute this software
34// is hereby granted without fee, provided that the above copyright
35// notice appears in all copies, and that both that copyright notice
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41
42/**
43 * @file cond_dealtor.hpp
44 * Contains a conditional deallocator.
45 */
46
47#ifndef PB_DS_COND_DEALTOR_HPP
48#define PB_DS_COND_DEALTOR_HPP
49
50namespace pb_ds
51{
52
53  namespace detail
54  {
55
56#define PB_DS_COND_DEALTOR_CLASS_T_DEC		\
57    template<typename Entry, class Allocator>
58
59#define PB_DS_COND_DEALTOR_CLASS_C_DEC				\
60    cond_dealtor<						\
61						Entry,		\
62						Allocator>
63
64    template<typename Entry, class Allocator>
65    class cond_dealtor
66    {
67    public:
68      typedef
69      typename Allocator::template rebind<Entry>::other
70      entry_allocator;
71
72      typedef typename entry_allocator::pointer entry_pointer;
73
74    public:
75      inline
76      cond_dealtor(entry_pointer p_e);
77
78      inline
79      ~cond_dealtor();
80
81      inline void
82      set_no_action();
83
84    private:
85      entry_pointer m_p_e;
86
87      bool m_no_action_destructor;
88
89      static entry_allocator s_alloc;
90    };
91
92    PB_DS_COND_DEALTOR_CLASS_T_DEC
93    typename PB_DS_COND_DEALTOR_CLASS_C_DEC::entry_allocator
94    PB_DS_COND_DEALTOR_CLASS_C_DEC::s_alloc;
95
96    PB_DS_COND_DEALTOR_CLASS_T_DEC
97    inline
98    PB_DS_COND_DEALTOR_CLASS_C_DEC::
99    cond_dealtor(entry_pointer p_e) :
100      m_p_e(p_e),
101      m_no_action_destructor(false)
102    { }
103
104    PB_DS_COND_DEALTOR_CLASS_T_DEC
105    inline void
106    PB_DS_COND_DEALTOR_CLASS_C_DEC::
107    set_no_action()
108    {
109      m_no_action_destructor = true;
110    }
111
112    PB_DS_COND_DEALTOR_CLASS_T_DEC
113    inline
114    PB_DS_COND_DEALTOR_CLASS_C_DEC::
115    ~cond_dealtor()
116    {
117      if (m_no_action_destructor)
118        return;
119
120      s_alloc.deallocate(m_p_e, 1);
121    }
122
123#undef PB_DS_COND_DEALTOR_CLASS_T_DEC
124#undef PB_DS_COND_DEALTOR_CLASS_C_DEC
125
126  } // namespace detail
127
128} // namespace pb_ds
129
130#endif // #ifndef PB_DS_COND_DEALTOR_HPP
131
132