1// -*- C++ -*-
2
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.
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// 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
18// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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
25// produce an executable, this file does not by itself cause the
26// resulting executable to be covered by the GNU General Public
27// License.  This exception does not however invalidate any other
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.
32
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
36// and this permission notice appear in supporting documentation. None
37// of the above authors, nor IBM Haifa Research Laboratories, make any
38// representation about the suitability of this software for any
39// purpose. It is provided "as is" without express or implied
40// warranty.
41
42/**
43 * @file cond_dtor.hpp
44 * Contains a conditional destructor
45 */
46
47template<typename Size_Type>
48class cond_dtor
49{
50public:
51  cond_dtor(value_vector a_vec, iterator& r_last_it, Size_Type total_size)
52  : m_a_vec(a_vec), m_r_last_it(r_last_it), m_max_size(total_size),
53    m_no_action(false)
54  { }
55
56  ~cond_dtor()
57  {
58    if (m_no_action)
59      return;
60    iterator it = m_a_vec;
61    while (it != m_r_last_it)
62      {
63	it->~value_type();
64	++it;
65      }
66
67    if (m_max_size > 0)
68      value_allocator().deallocate(m_a_vec, m_max_size);
69  }
70
71  inline void
72  set_no_action()
73  { m_no_action = true; }
74
75protected:
76  value_vector m_a_vec;
77  iterator& m_r_last_it;
78  const Size_Type m_max_size;
79  bool m_no_action;
80};
81