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_key_dtor_entry_dealtor.hpp
44 * Contains a conditional key destructor, used for exception handling.
45 */
46
47namespace pb_ds
48{
49  namespace detail
50  {
51
52#define PB_DS_CLASS_T_DEC template<typename HT_Map>
53#define PB_DS_CLASS_C_DEC PB_DS_CKDED_CLASS_NAME<HT_Map>
54
55    /**
56     * A conditional key destructor, used for exception handling.
57     **/
58    template<typename HT_Map>
59    class PB_DS_CKDED_CLASS_NAME
60    {
61    public:
62      typedef typename HT_Map::entry entry;
63      typedef typename HT_Map::entry_allocator entry_allocator;
64      typedef typename HT_Map::key_type key_type;
65
66      inline
67      PB_DS_CKDED_CLASS_NAME(entry_allocator* p_a, entry* p_e);
68
69      inline
70      ~PB_DS_CKDED_CLASS_NAME();
71
72      inline void
73      set_key_destruct();
74
75      inline void
76      set_no_action_destructor();
77
78    protected:
79      entry_allocator* const m_p_a;
80      entry* const m_p_e;
81
82      bool m_key_destruct;
83      bool m_no_action_destructor;
84    };
85
86    PB_DS_CLASS_T_DEC
87    inline
88    PB_DS_CLASS_C_DEC::
89    PB_DS_CKDED_CLASS_NAME(entry_allocator* p_a, entry* p_e)
90    : m_p_a(p_a), m_p_e(p_e), m_key_destruct(false),
91      m_no_action_destructor(false)
92    { }
93
94    PB_DS_CLASS_T_DEC
95    inline void
96    PB_DS_CLASS_C_DEC::
97    set_key_destruct()
98    { m_key_destruct = true; }
99
100    PB_DS_CLASS_T_DEC
101    inline void
102    PB_DS_CLASS_C_DEC::
103    set_no_action_destructor()
104    { m_no_action_destructor = true; }
105
106    PB_DS_CLASS_T_DEC
107    inline
108    PB_DS_CLASS_C_DEC::
109    ~PB_DS_CKDED_CLASS_NAME()
110    {
111      if (m_no_action_destructor)
112	return;
113      if (m_key_destruct)
114	m_p_e->m_value.first.~key_type();
115      m_p_a->deallocate(m_p_e, 1);
116    }
117
118#undef PB_DS_CLASS_T_DEC
119#undef PB_DS_CLASS_C_DEC
120
121  } // namespace detail
122} // namespace pb_ds
123
124