30 #ifndef _SCOPED_ALLOCATOR
31 #define _SCOPED_ALLOCATOR 1
33 #pragma GCC system_header
35 #if __cplusplus < 201103L
44 namespace std _GLIBCXX_VISIBILITY(default)
46 _GLIBCXX_BEGIN_NAMESPACE_VERSION
55 template<
typename _Alloc>
56 using __outer_allocator_t
57 = decltype(std::declval<_Alloc>().outer_allocator());
59 template<
typename _Alloc,
typename =
void>
60 struct __outermost_type
63 static type& _S_outermost(_Alloc& __a) {
return __a; }
66 template<
typename _Alloc>
67 struct __outermost_type<_Alloc, __void_t<__outer_allocator_t<_Alloc>>>
69 typename remove_reference<__outer_allocator_t<_Alloc>>::type
72 using __base = __outermost_type<
73 typename remove_reference<__outer_allocator_t<_Alloc>>::type
76 static typename __base::type&
77 _S_outermost(_Alloc& __a)
78 {
return __base::_S_outermost(__a.outer_allocator()); }
82 template<
typename _Alloc>
83 inline typename __outermost_type<_Alloc>::type&
84 __outermost(_Alloc& __a)
85 {
return __outermost_type<_Alloc>::_S_outermost(__a); }
87 template<
typename _OuterAlloc,
typename... _InnerAllocs>
88 class scoped_allocator_adaptor;
91 struct __inner_type_impl;
93 template<
typename _Outer>
94 struct __inner_type_impl<_Outer>
96 typedef scoped_allocator_adaptor<_Outer> __type;
98 __inner_type_impl() =
default;
99 __inner_type_impl(
const __inner_type_impl&) =
default;
100 __inner_type_impl(__inner_type_impl&&) =
default;
101 __inner_type_impl& operator=(
const __inner_type_impl&) =
default;
102 __inner_type_impl& operator=(__inner_type_impl&&) =
default;
104 template<
typename _Alloc>
105 __inner_type_impl(
const __inner_type_impl<_Alloc>& __other)
108 template<
typename _Alloc>
109 __inner_type_impl(__inner_type_impl<_Alloc>&& __other)
113 _M_get(__type* __p) noexcept {
return *__p; }
116 _M_get(
const __type* __p)
const noexcept {
return *__p; }
119 _M_tie() const noexcept {
return tuple<>(); }
122 operator==(
const __inner_type_impl&) const noexcept
126 template<
typename _Outer,
typename _InnerHead,
typename... _InnerTail>
127 struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...>
129 typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type;
131 __inner_type_impl() =
default;
132 __inner_type_impl(
const __inner_type_impl&) =
default;
133 __inner_type_impl(__inner_type_impl&&) =
default;
134 __inner_type_impl& operator=(
const __inner_type_impl&) =
default;
135 __inner_type_impl& operator=(__inner_type_impl&&) =
default;
137 template<
typename... _Allocs>
138 __inner_type_impl(
const __inner_type_impl<_Allocs...>& __other)
139 : _M_inner(__other._M_inner) { }
141 template<
typename... _Allocs>
142 __inner_type_impl(__inner_type_impl<_Allocs...>&& __other)
143 : _M_inner(std::
move(__other._M_inner)) { }
145 template<
typename... _Args>
147 __inner_type_impl(_Args&&... __args)
148 : _M_inner(std::
forward<_Args>(__args)...) { }
151 _M_get(
void*) noexcept {
return _M_inner; }
154 _M_get(
const void*) const noexcept {
return _M_inner; }
156 tuple<
const _InnerHead&,
const _InnerTail&...>
157 _M_tie() const noexcept
158 {
return _M_inner._M_tie(); }
161 operator==(
const __inner_type_impl& __other)
const noexcept
162 {
return _M_inner == __other._M_inner; }
165 template<
typename...>
friend class __inner_type_impl;
166 template<
typename,
typename...>
friend class scoped_allocator_adaptor;
174 template<
typename _OuterAlloc,
typename... _InnerAllocs>
180 typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type;
181 __inner_type _M_inner;
183 template<
typename _Outer,
typename... _Inner>
186 template<
typename...>
187 friend class __inner_type_impl;
189 tuple<
const _OuterAlloc&,
const _InnerAllocs&...>
190 _M_tie()
const noexcept
191 {
return std::tuple_cat(
std::tie(outer_allocator()), _M_inner._M_tie()); }
193 template<
typename _Alloc>
197 #if __cplusplus <= 201703
198 template<
typename _Tp,
typename... _Args>
200 _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args)
203 _O_traits::construct(__outermost(*
this), __p,
204 std::forward<_Args>(__args)...);
207 typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_;
208 typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_;
210 template<
typename _Tp,
typename... _Args>
212 _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args)
215 _O_traits::construct(__outermost(*
this), __p,
216 allocator_arg, inner_allocator(),
217 std::forward<_Args>(__args)...);
220 template<
typename _Tp,
typename... _Args>
222 _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args)
225 _O_traits::construct(__outermost(*
this), __p,
226 std::forward<_Args>(__args)...,
231 template<
typename _Alloc>
233 _S_select_on_copy(
const _Alloc& __a)
236 return __a_traits::select_on_container_copy_construction(__a);
239 template<std::size_t... _Indices>
241 const _InnerAllocs&...> __refs,
242 _Index_tuple<_Indices...>)
243 : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))),
244 _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...)
248 template<
typename _Alloc>
249 using _Constructible =
typename enable_if<
255 template<
typename _Tp>
256 struct __not_pair {
using type = void; };
258 template<
typename _Tp,
typename _Up>
259 struct __not_pair<pair<_Tp, _Up>> { };
262 typedef _OuterAlloc outer_allocator_type;
263 typedef typename __inner_type::__type inner_allocator_type;
273 typedef typename __or_<
276 propagate_on_container_copy_assignment...>::type
277 propagate_on_container_copy_assignment;
279 typedef typename __or_<
282 propagate_on_container_move_assignment...>::type
283 propagate_on_container_move_assignment;
285 typedef typename __or_<
288 propagate_on_container_swap...>::type
289 propagate_on_container_swap;
291 typedef typename __and_<
299 typedef scoped_allocator_adaptor<
300 typename __traits::template rebind_alloc<_Tp>,
301 _InnerAllocs...> other;
304 scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { }
306 template<
typename _Outer2,
typename = _Constructible<_Outer2>>
307 scoped_allocator_adaptor(_Outer2&& __outer,
308 const _InnerAllocs&... __inner)
309 : _OuterAlloc(std::forward<_Outer2>(__outer)),
313 scoped_allocator_adaptor(
const scoped_allocator_adaptor& __other)
314 : _OuterAlloc(__other.outer_allocator()),
315 _M_inner(__other._M_inner)
318 scoped_allocator_adaptor(scoped_allocator_adaptor&& __other)
319 : _OuterAlloc(
std::move(__other.outer_allocator())),
323 template<
typename _Outer2,
typename = _Constructible<const _Outer2&>>
324 scoped_allocator_adaptor(
326 : _OuterAlloc(__other.outer_allocator()),
327 _M_inner(__other._M_inner)
330 template<
typename _Outer2,
typename = _Constructible<_Outer2>>
331 scoped_allocator_adaptor(
333 : _OuterAlloc(
std::move(__other.outer_allocator())),
337 scoped_allocator_adaptor&
338 operator=(
const scoped_allocator_adaptor&) =
default;
340 scoped_allocator_adaptor&
341 operator=(scoped_allocator_adaptor&&) =
default;
343 inner_allocator_type& inner_allocator() noexcept
344 {
return _M_inner._M_get(
this); }
346 const inner_allocator_type& inner_allocator()
const noexcept
347 {
return _M_inner._M_get(
this); }
349 outer_allocator_type& outer_allocator() noexcept
350 {
return static_cast<_OuterAlloc&
>(*this); }
352 const outer_allocator_type& outer_allocator()
const noexcept
353 {
return static_cast<const _OuterAlloc&
>(*this); }
355 _GLIBCXX_NODISCARD pointer allocate(size_type __n)
356 {
return __traits::allocate(outer_allocator(), __n); }
358 _GLIBCXX_NODISCARD pointer allocate(size_type __n, const_void_pointer __hint)
359 {
return __traits::allocate(outer_allocator(), __n, __hint); }
361 void deallocate(pointer __p, size_type __n)
364 size_type max_size()
const
367 #if __cplusplus <= 201703
368 template<
typename _Tp,
typename... _Args>
369 typename __not_pair<_Tp>::type
370 construct(_Tp* __p, _Args&&... __args)
372 auto& __inner = inner_allocator();
374 = std::__use_alloc<_Tp, inner_allocator_type, _Args...>(__inner);
375 _M_construct(__use_tag, __p, std::forward<_Args>(__args)...);
378 template<
typename _T1,
typename _T2,
typename... _Args1,
386 auto& __inner = inner_allocator();
388 = std::__use_alloc<_T1, inner_allocator_type, _Args1...>(__inner);
390 = std::__use_alloc<_T2, inner_allocator_type, _Args2...>(__inner);
391 typename _Build_index_tuple<
sizeof...(_Args1)>::__type __x_indices;
392 typename _Build_index_tuple<
sizeof...(_Args2)>::__type __y_indices;
395 _M_construct_p(__x_use_tag, __x_indices, __x),
396 _M_construct_p(__y_use_tag, __y_indices, __y));
399 template<
typename _T1,
typename _T2>
404 template<
typename _T1,
typename _T2,
typename _Up,
typename _Vp>
413 template<
typename _T1,
typename _T2,
typename _Up,
typename _Vp>
422 template<
typename _T1,
typename _T2,
typename _Up,
typename _Vp>
431 template<
typename _Tp,
typename... _Args>
432 __attribute__((__nonnull__))
434 construct(_Tp* __p, _Args&&... __args)
437 std::apply([__p,
this](
auto&&... __newargs) {
438 _O_traits::construct(__outermost(*
this), __p,
441 uses_allocator_construction_args<_Tp>(inner_allocator(),
442 std::forward<_Args>(__args)...));
446 template<
typename _Tp>
447 void destroy(_Tp* __p)
450 _O_traits::destroy(__outermost(*
this), __p);
453 scoped_allocator_adaptor
454 select_on_container_copy_construction()
const
456 typedef typename _Build_index_tuple<
sizeof...(_InnerAllocs)>::__type
458 return scoped_allocator_adaptor(_M_tie(), _Indices());
461 template <
typename _OutA1,
typename _OutA2,
typename... _InA>
467 #if __cplusplus <= 201703L
468 template<
typename _Ind,
typename... _Args>
473 template<
size_t... _Ind,
typename... _Args>
475 _M_construct_p(__uses_alloc1_, _Index_tuple<_Ind...>,
478 return { allocator_arg, inner_allocator(),
483 template<
size_t... _Ind,
typename... _Args>
484 tuple<_Args&&..., inner_allocator_type&>
485 _M_construct_p(__uses_alloc2_, _Index_tuple<_Ind...>,
488 return { std::get<_Ind>(
std::move(__t))..., inner_allocator() };
494 template <
typename _OutA1,
typename _OutA2,
typename... _InA>
499 return __a.outer_allocator() == __b.outer_allocator()
500 && __a._M_inner == __b._M_inner;
503 #if __cpp_impl_three_way_comparison < 201907L
505 template <
typename _OutA1,
typename _OutA2,
typename... _InA>
509 {
return !(__a == __b); }
514 _GLIBCXX_END_NAMESPACE_VERSION
519 #endif // _SCOPED_ALLOCATOR
__detected_or_t< value_type *, __pointer, _Alloc > pointer
The allocator's pointer type.
typename _Size< _Alloc, difference_type >::type size_type
The allocator's size type.
static constexpr size_type max_size(const _Alloc &__a) noexcept
The maximum supported allocation size.
typename _Ptr< __v_pointer, void >::type void_pointer
The allocator's void pointer type.
constexpr tuple< _Elements &&...> forward_as_tuple(_Elements &&...__args) noexcept
std::forward_as_tuple
static constexpr void deallocate(_Alloc &__a, pointer __p, size_type __n)
Deallocate memory.
Tag type for piecewise construction of std::pair objects.
Define a member typedef type only if a boolean constant is true.
_T1 first
The first member.
__detected_or_t< false_type, __pocma, _Alloc > propagate_on_container_move_assignment
How the allocator is propagated on move assignment.
constexpr tuple< _Elements &...> tie(_Elements &...__args) noexcept
tie
_Alloc::value_type value_type
The allocated type.
__detected_or_t< typename is_empty< _Alloc >::type, __equal, _Alloc > is_always_equal
Whether all instances of the allocator type compare equal.
_T2 second
The second member.
bool operator!=(const scoped_allocator_adaptor< _OutA1, _InA...> &__a, const scoped_allocator_adaptor< _OutA2, _InA...> &__b) noexcept
Uniform interface to all allocator types.
Primary class template, tuple.
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
constexpr _Iterator __base(_Iterator __it)
__detected_or_t< false_type, __pocs, _Alloc > propagate_on_container_swap
How the allocator is propagated on swap.
An adaptor to recursively pass an allocator to the objects it constructs.
typename _Ptr< __cv_pointer, const void >::type const_void_pointer
The allocator's const void pointer type.
Struct holding two objects of arbitrary type.
bool operator==(const scoped_allocator_adaptor< _OutA1, _InA...> &__a, const scoped_allocator_adaptor< _OutA2, _InA...> &__b) noexcept
__detected_or_t< false_type, __pocca, _Alloc > propagate_on_container_copy_assignment
How the allocator is propagated on copy assignment.
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
typename _Diff< _Alloc, pointer >::type difference_type
The allocator's difference type.
typename _Ptr< __c_pointer, const value_type >::type const_pointer
The allocator's const pointer type.
constexpr piecewise_construct_t piecewise_construct
Tag for piecewise construction of std::pair objects.