libstdc++
safe_container.h
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1 // Safe container implementation -*- C++ -*-
2 
3 // Copyright (C) 2014-2020 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
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU 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 /** @file debug/safe_container.h
26  * This file is a GNU debug extension to the Standard C++ Library.
27  */
28 
29 #ifndef _GLIBCXX_DEBUG_SAFE_CONTAINER_H
30 #define _GLIBCXX_DEBUG_SAFE_CONTAINER_H 1
31 
32 #include <ext/alloc_traits.h>
33 
34 namespace __gnu_debug
35 {
36  /// Safe class dealing with some allocator dependent operations.
37  template<typename _SafeContainer,
38  typename _Alloc,
39  template<typename> class _SafeBase,
40  bool _IsCxx11AllocatorAware = true>
42  : public _SafeBase<_SafeContainer>
43  {
44  typedef _SafeBase<_SafeContainer> _Base;
45 
46  _SafeContainer&
47  _M_cont() _GLIBCXX_NOEXCEPT
48  { return *static_cast<_SafeContainer*>(this); }
49 
50  protected:
52  _M_safe() _GLIBCXX_NOEXCEPT
53  { return *this; }
54 
55 #if __cplusplus >= 201103L
56  _Safe_container() = default;
57  _Safe_container(const _Safe_container&) = default;
58  _Safe_container(_Safe_container&&) = default;
59 
60  _Safe_container(_Safe_container&& __x, const _Alloc& __a)
61  : _Safe_container()
62  {
63  if (__x._M_cont().get_allocator() == __a)
64  _Base::_M_swap(__x);
65  else
66  __x._M_invalidate_all();
67  }
68 #endif
69 
70  public:
71  // Copy assignment invalidate all iterators.
73  operator=(const _Safe_container&) _GLIBCXX_NOEXCEPT
74  {
75  this->_M_invalidate_all();
76  return *this;
77  }
78 
79 #if __cplusplus >= 201103L
81  operator=(_Safe_container&& __x) noexcept
82  {
83  __glibcxx_check_self_move_assign(__x);
84 
85  if (_IsCxx11AllocatorAware)
86  {
87  typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits;
88 
89  bool __xfer_memory = _Alloc_traits::_S_propagate_on_move_assign()
90  || _M_cont().get_allocator() == __x._M_cont().get_allocator();
91  if (__xfer_memory)
92  _Base::_M_swap(__x);
93  else
94  this->_M_invalidate_all();
95  }
96  else
97  _Base::_M_swap(__x);
98 
99  __x._M_invalidate_all();
100  return *this;
101  }
102 
103  void
104  _M_swap(_Safe_container& __x) noexcept
105  {
106  if (_IsCxx11AllocatorAware)
107  {
108  typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits;
109 
110  if (!_Alloc_traits::_S_propagate_on_swap())
111  __glibcxx_check_equal_allocs(this->_M_cont()._M_base(),
112  __x._M_cont()._M_base());
113  }
114 
115  _Base::_M_swap(__x);
116  }
117 #endif
118  };
119 
120 } // namespace __gnu_debug
121 
122 #endif
GNU debug classes for public use.
Safe class dealing with some allocator dependent operations.
Uniform interface to C++98 and C++11 allocators.