libstdc++
safe_container.h
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1// Safe container implementation -*- C++ -*-
2
3// Copyright (C) 2014-2021 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
34namespace __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;
59
60 _Safe_container(_Safe_container&& __x, const _Alloc& __a)
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 if (std::__addressof(__x) == this)
84 {
85 // Standard containers have a valid but unspecified value after
86 // self-move, so we invalidate all debug iterators even if the
87 // underlying container happens to preserve its contents.
88 this->_M_invalidate_all();
89 return *this;
90 }
91
92 if (_IsCxx11AllocatorAware)
93 {
94 typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits;
95
96 bool __xfer_memory = _Alloc_traits::_S_propagate_on_move_assign()
97 || _M_cont().get_allocator() == __x._M_cont().get_allocator();
98 if (__xfer_memory)
99 _Base::_M_swap(__x);
100 else
101 this->_M_invalidate_all();
102 }
103 else
104 _Base::_M_swap(__x);
105
106 __x._M_invalidate_all();
107 return *this;
108 }
109
110 void
111 _M_swap(_Safe_container& __x) noexcept
112 {
113 if (_IsCxx11AllocatorAware)
114 {
115 typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits;
116
117 if (!_Alloc_traits::_S_propagate_on_swap())
118 __glibcxx_check_equal_allocs(this->_M_cont()._M_base(),
119 __x._M_cont()._M_base());
120 }
121
122 _Base::_M_swap(__x);
123 }
124#endif
125 };
126
127} // namespace __gnu_debug
128
129#endif
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:49
GNU debug classes for public use.
Safe class dealing with some allocator dependent operations.
Uniform interface to C++98 and C++11 allocators.