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 cc_hash_table_map_/cond_key_dtor_entry_dealtor.hpp
38 * Contains a conditional key destructor, used for exception handling.
39 */
40
41namespace __gnu_pbds
42{
43  namespace detail
44  {
45    /// Conditional dey destructor, cc_hash.
46    template<typename HT_Map>
47    class cond_dealtor
48    {
49    public:
50      typedef typename HT_Map::entry 		entry;
51      typedef typename HT_Map::entry_allocator 	entry_allocator;
52      typedef typename HT_Map::key_type 	key_type;
53
54      cond_dealtor(entry_allocator* p_a, entry* p_e)
55      : m_p_a(p_a), m_p_e(p_e), m_key_destruct(false),
56	m_no_action_destructor(false)
57      { }
58
59      inline
60      ~cond_dealtor();
61
62      void
63      set_key_destruct()
64      { m_key_destruct = true; }
65
66      void
67      set_no_action_destructor()
68      { m_no_action_destructor = true; }
69
70    protected:
71      entry_allocator* const 			m_p_a;
72      entry* const 				m_p_e;
73
74      bool 					m_key_destruct;
75      bool 					m_no_action_destructor;
76    };
77
78    template<typename HT_Map>
79    inline
80    cond_dealtor<HT_Map>::
81    ~cond_dealtor()
82    {
83      if (m_no_action_destructor)
84	return;
85      if (m_key_destruct)
86	m_p_e->m_value.first.~key_type();
87      m_p_a->deallocate(m_p_e, 1);
88    }
89  } // namespace detail
90} // namespace __gnu_pbds
91