1// -*- C++ -*-
2
3// Copyright (C) 2005-2015 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 3, 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// 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.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23// <http://www.gnu.org/licenses/>.
24
25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
26
27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
29// notice appears in all copies, and that both that copyright notice
30// and this permission notice appear in supporting documentation. None
31// of the above authors, nor IBM Haifa Research Laboratories, make any
32// representation about the suitability of this software for any
33// purpose. It is provided "as is" without express or implied
34// warranty.
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>
50      class cond_dealtor
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
80      cond_dealtor<Entry, _Alloc>::s_alloc;
81  } // namespace detail
82} // namespace __gnu_pbds
83
84#endif // #ifndef PB_DS_COND_DEALTOR_HPP
85