libstdc++: new_allocator.h Source File (original) (raw)
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30#ifndef _STD_NEW_ALLOCATOR_H
31#define _STD_NEW_ALLOCATOR_H 1
32
34#include <new>
37#if __cplusplus >= 201103L
39#endif
40
41namespace std _GLIBCXX_VISIBILITY(default)
42{
43_GLIBCXX_BEGIN_NAMESPACE_VERSION
44
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61
62 template<typename _Tp>
64 {
65 public:
66 typedef _Tp value_type;
67 typedef std::size_t size_type;
68 typedef std::ptrdiff_t difference_type;
69#if __cplusplus <= 201703L
70 typedef _Tp* pointer;
71 typedef const _Tp* const_pointer;
72 typedef _Tp& reference;
73 typedef const _Tp& const_reference;
74
75 template<typename _Tp1>
76 struct rebind
78#endif
79
80#if __cplusplus >= 201103L
81
82
83 typedef std::true_type propagate_on_container_move_assignment;
84#endif
85
86 __attribute__((__always_inline__))
87 _GLIBCXX20_CONSTEXPR
89
90 __attribute__((__always_inline__))
91 _GLIBCXX20_CONSTEXPR
93
94 template<typename _Tp1>
95 __attribute__((__always_inline__))
96 _GLIBCXX20_CONSTEXPR
98
99#if __cplusplus >= 201103L
101#endif
102
103#if __cplusplus <= 201703L
105
106 pointer
107 address(reference __x) const _GLIBCXX_NOEXCEPT
109
110 const_pointer
111 address(const_reference __x) const _GLIBCXX_NOEXCEPT
113#endif
114
115#if __has_builtin(__builtin_operator_new) >= 201802L
116# define _GLIBCXX_OPERATOR_NEW __builtin_operator_new
117# define _GLIBCXX_OPERATOR_DELETE __builtin_operator_delete
118#else
119# define _GLIBCXX_OPERATOR_NEW ::operator new
120# define _GLIBCXX_OPERATOR_DELETE ::operator delete
121#endif
122
123
124
125 _GLIBCXX_NODISCARD _Tp*
126 allocate(size_type __n, const void* = static_cast<const void*>(0))
127 {
128#if __cplusplus >= 201103L
129
130
131 static_assert(sizeof(_Tp) != 0, "cannot allocate incomplete types");
132#endif
133
134 if (__builtin_expect(__n > this->_M_max_size(), false))
135 {
136
137
138 if (__n > (std::size_t(-1) / sizeof(_Tp)))
139 std::__throw_bad_array_new_length();
140 std::__throw_bad_alloc();
141 }
142
143#if __cpp_aligned_new && __cplusplus >= 201103L
144 if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
145 {
146 std::align_val_t __al = std::align_val_t(alignof(_Tp));
147 return static_cast<_Tp*>(_GLIBCXX_OPERATOR_NEW(__n * sizeof(_Tp),
148 __al));
149 }
150#endif
151 return static_cast<_Tp*>(_GLIBCXX_OPERATOR_NEW(__n * sizeof(_Tp)));
152 }
153
154
155 void
156 deallocate(_Tp* __p, size_type __n __attribute__ ((__unused__)))
157 {
158#if __cpp_sized_deallocation
159# define _GLIBCXX_SIZED_DEALLOC(p, n) (p), (n) * sizeof(_Tp)
160#else
161# define _GLIBCXX_SIZED_DEALLOC(p, n) (p)
162#endif
163
164#if __cpp_aligned_new && __cplusplus >= 201103L
165 if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
166 {
167 _GLIBCXX_OPERATOR_DELETE(_GLIBCXX_SIZED_DEALLOC(__p, __n),
168 std::align_val_t(alignof(_Tp)));
169 return;
170 }
171#endif
172 _GLIBCXX_OPERATOR_DELETE(_GLIBCXX_SIZED_DEALLOC(__p, __n));
173 }
174
175#undef _GLIBCXX_SIZED_DEALLOC
176#undef _GLIBCXX_OPERATOR_DELETE
177#undef _GLIBCXX_OPERATOR_NEW
178
179#if __cplusplus <= 201703L
180 __attribute__((__always_inline__))
181 size_type
182 max_size() const _GLIBCXX_USE_NOEXCEPT
183 { return _M_max_size(); }
184
185#if __cplusplus >= 201103L
186 template<typename _Up, typename... _Args>
187 __attribute__((__always_inline__))
188 void
189 construct(_Up* __p, _Args&&... __args)
190 noexcept(__is_nothrow_new_constructible<_Up, _Args...>)
191 { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
192
193 template<typename _Up>
194 __attribute__((__always_inline__))
195 void
196 destroy(_Up* __p)
198 { __p->~_Up(); }
199#else
200
201
202 __attribute__((__always_inline__))
203 void
204 construct(pointer __p, const _Tp& __val)
205 { ::new((void *)__p) _Tp(__val); }
206
207 __attribute__((__always_inline__))
208 void
209 destroy(pointer __p) { __p->~_Tp(); }
210#endif
211#endif
212
213 template<typename _Up>
214 friend __attribute__((__always_inline__)) _GLIBCXX20_CONSTEXPR bool
216 _GLIBCXX_NOTHROW
217 { return true; }
218
219#if __cpp_impl_three_way_comparison < 201907L
220 template<typename _Up>
221 friend __attribute__((__always_inline__)) _GLIBCXX20_CONSTEXPR bool
223 _GLIBCXX_NOTHROW
224 { return false; }
225#endif
226
227 private:
228 __attribute__((__always_inline__))
229 _GLIBCXX_CONSTEXPR size_type
230 _M_max_size() const _GLIBCXX_USE_NOEXCEPT
231 {
232#if __PTRDIFF_MAX__ < __SIZE_MAX__
233 return std::size_t(__PTRDIFF_MAX__) / sizeof(_Tp);
234#else
235 return std::size_t(-1) / sizeof(_Tp);
236#endif
237 }
238 };
239
240_GLIBCXX_END_NAMESPACE_VERSION
241}
242
243#endif
__bool_constant< true > true_type
The type used as a compile-time boolean with true value.
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
ISO C++ entities toplevel namespace is std.
An allocator that uses global new, as per C++03 [20.4.1].