1 // Allocator that wraps operator new -*- C++ -*-
2
3 // Copyright (C) 2001-2019 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 ext/new_allocator.h
26 * This file is a GNU extension to the Standard C++ Library.
27 */
28
29 #ifndef _NEW_ALLOCATOR_H
30 #define _NEW_ALLOCATOR_H 1
31
32 #include <bits/c++config.h>
33 #include <new>
34 #include <bits/functexcept.h>
35 #include <bits/move.h>
36 #if __cplusplus >= 201103L
37 #include <type_traits>
38 #endif
39
40 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
41 {
42 _GLIBCXX_BEGIN_NAMESPACE_VERSION
43
44 using std::size_t;
45 using std::ptrdiff_t;
46
47 /**
48 * @brief An allocator that uses global new, as per [20.4].
49 * @ingroup allocators
50 *
51 * This is precisely the allocator defined in the C++ Standard.
52 * - all allocation calls operator new
53 * - all deallocation calls operator delete
54 *
55 * @tparam _Tp Type of allocated object.
56 */
57 template<typename _Tp>
58 class new_allocator
59 {
60 public:
61 typedef size_t size_type;
62 typedef ptrdiff_t difference_type;
63 typedef _Tp* pointer;
64 typedef const _Tp* const_pointer;
65 typedef _Tp& reference;
66 typedef const _Tp& const_reference;
67 typedef _Tp value_type;
68
69 template<typename _Tp1>
70 struct rebind
71 { typedef new_allocator<_Tp1> other; };
72
73 #if __cplusplus >= 201103L
74 // _GLIBCXX_RESOLVE_LIB_DEFECTS
75 // 2103. propagate_on_container_move_assignment
76 typedef std::true_type propagate_on_container_move_assignment;
77 #endif
78
79 _GLIBCXX20_CONSTEXPR
80 new_allocator() _GLIBCXX_USE_NOEXCEPT { }
81
82 _GLIBCXX20_CONSTEXPR
83 new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }
84
85 template<typename _Tp1>
86 _GLIBCXX20_CONSTEXPR
87 new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }
88
89 ~new_allocator() _GLIBCXX_USE_NOEXCEPT { }
90
91 pointer
92 address(reference __x) const _GLIBCXX_NOEXCEPT
93 { return std::__addressof(__x); }
94
95 const_pointer
96 address(const_reference __x) const _GLIBCXX_NOEXCEPT
97 { return std::__addressof(__x); }
98
99 // NB: __n is permitted to be 0. The C++ standard says nothing
100 // about what the return value is when __n == 0.
101 _GLIBCXX_NODISCARD pointer
102 allocate(size_type __n, const void* = static_cast<const void*>(0))
103 {
104 if (__n > this->max_size())
105 std::__throw_bad_alloc();
106
107 #if __cpp_aligned_new
108 if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
109 {
110 std::align_val_t __al = std::align_val_t(alignof(_Tp));
111 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp), __al));
112 }
113 #endif
114 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
115 }
116
117 // __p is not permitted to be a null pointer.
118 void
119 deallocate(pointer __p, size_type)
120 {
121 #if __cpp_aligned_new
122 if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
123 {
124 ::operator delete(__p, std::align_val_t(alignof(_Tp)));
125 return;
126 }
127 #endif
128 ::operator delete(__p);
129 }
130
131 size_type
132 max_size() const _GLIBCXX_USE_NOEXCEPT
133 {
134 #if __PTRDIFF_MAX__ < __SIZE_MAX__
135 return size_t(__PTRDIFF_MAX__) / sizeof(_Tp);
136 #else
137 return size_t(-1) / sizeof(_Tp);
138 #endif
139 }
140
141 #if __cplusplus >= 201103L
142 template<typename _Up, typename... _Args>
143 void
144 construct(_Up* __p, _Args&&... __args)
145 noexcept(noexcept(::new((void *)__p)
146 _Up(std::forward<_Args>(__args)...)))
|
(1) Event fun_call_w_exception: |
Called function throws an exception of type "ceph::buffer::v14_2_0::end_of_buffer". [details] |
147 { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
148
149 template<typename _Up>
150 void
151 destroy(_Up* __p)
152 noexcept(noexcept( __p->~_Up()))
153 { __p->~_Up(); }
154 #else
155 // _GLIBCXX_RESOLVE_LIB_DEFECTS
156 // 402. wrong new expression in [some_] allocator::construct
157 void
158 construct(pointer __p, const _Tp& __val)
159 { ::new((void *)__p) _Tp(__val); }
160
161 void
162 destroy(pointer __p) { __p->~_Tp(); }
163 #endif
164
165 template<typename _Up>
166 friend bool
167 operator==(const new_allocator&, const new_allocator<_Up>&)
168 _GLIBCXX_NOTHROW
169 { return true; }
170
171 template<typename _Up>
172 friend bool
173 operator!=(const new_allocator&, const new_allocator<_Up>&)
174 _GLIBCXX_NOTHROW
175 { return false; }
176 };
177
178 _GLIBCXX_END_NAMESPACE_VERSION
179 } // namespace
180
181 #endif
182