30 #ifndef _SCOPED_ALLOCATOR
31 #define _SCOPED_ALLOCATOR 1
33 #pragma GCC system_header
35 #if __cplusplus < 201103L
42 #include <bits/uses_allocator.h>
43 #if __cplusplus > 201703L
47 namespace std _GLIBCXX_VISIBILITY(default)
49 _GLIBCXX_BEGIN_NAMESPACE_VERSION
56 template<
typename _OuterAlloc,
typename... _InnerAllocs>
61 template<
typename _Alloc>
62 using __outer_allocator_t
63 = decltype(std::declval<_Alloc>().outer_allocator());
65 template<
typename _Alloc,
typename =
void>
66 struct __outermost_type
69 static type& _S_outermost(_Alloc& __a) {
return __a; }
72 template<
typename _Alloc>
73 struct __outermost_type<_Alloc, __void_t<__outer_allocator_t<_Alloc>>>
75 typename remove_reference<__outer_allocator_t<_Alloc>>::type
78 using __base = __outermost_type<
79 typename remove_reference<__outer_allocator_t<_Alloc>>::type
82 static typename __base::type&
83 _S_outermost(_Alloc& __a)
84 {
return __base::_S_outermost(__a.outer_allocator()); }
88 template<
typename _Alloc>
89 inline typename __outermost_type<_Alloc>::type&
90 __outermost(_Alloc& __a)
91 {
return __outermost_type<_Alloc>::_S_outermost(__a); }
94 struct __inner_type_impl;
96 template<
typename _Outer>
97 struct __inner_type_impl<_Outer>
99 typedef scoped_allocator_adaptor<_Outer> __type;
101 __inner_type_impl() =
default;
102 __inner_type_impl(
const __inner_type_impl&) =
default;
103 __inner_type_impl(__inner_type_impl&&) =
default;
104 __inner_type_impl& operator=(
const __inner_type_impl&) =
default;
105 __inner_type_impl& operator=(__inner_type_impl&&) =
default;
107 template<
typename _Alloc>
108 __inner_type_impl(
const __inner_type_impl<_Alloc>& __other)
111 template<
typename _Alloc>
112 __inner_type_impl(__inner_type_impl<_Alloc>&& __other)
116 _M_get(__type* __p) noexcept {
return *__p; }
119 _M_get(
const __type* __p)
const noexcept {
return *__p; }
122 _M_tie() const noexcept {
return tuple<>(); }
125 operator==(
const __inner_type_impl&) const noexcept
129 template<
typename _Outer,
typename _InnerHead,
typename... _InnerTail>
130 struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...>
132 typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type;
134 __inner_type_impl() =
default;
135 __inner_type_impl(
const __inner_type_impl&) =
default;
136 __inner_type_impl(__inner_type_impl&&) =
default;
137 __inner_type_impl& operator=(
const __inner_type_impl&) =
default;
138 __inner_type_impl& operator=(__inner_type_impl&&) =
default;
140 template<
typename... _Allocs>
141 __inner_type_impl(
const __inner_type_impl<_Allocs...>& __other)
142 : _M_inner(__other._M_inner) { }
144 template<
typename... _Allocs>
145 __inner_type_impl(__inner_type_impl<_Allocs...>&& __other)
146 : _M_inner(std::
move(__other._M_inner)) { }
148 template<
typename... _Args>
150 __inner_type_impl(_Args&&... __args)
151 : _M_inner(std::
forward<_Args>(__args)...) { }
154 _M_get(
void*) noexcept {
return _M_inner; }
157 _M_get(
const void*) const noexcept {
return _M_inner; }
159 tuple<
const _InnerHead&,
const _InnerTail&...>
160 _M_tie() const noexcept
161 {
return _M_inner._M_tie(); }
164 operator==(
const __inner_type_impl& __other)
const noexcept
165 {
return _M_inner == __other._M_inner; }
168 template<
typename...>
friend class __inner_type_impl;
169 template<
typename,
typename...>
friend class scoped_allocator_adaptor;
177 template<
typename _OuterAlloc,
typename... _InnerAllocs>
178 class scoped_allocator_adaptor
181 typedef allocator_traits<_OuterAlloc> __traits;
183 typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type;
184 __inner_type _M_inner;
186 template<
typename _Outer,
typename... _Inner>
187 friend class scoped_allocator_adaptor;
189 template<
typename...>
190 friend class __inner_type_impl;
192 tuple<
const _OuterAlloc&,
const _InnerAllocs&...>
193 _M_tie() const noexcept
194 {
return std::tuple_cat(
std::tie(outer_allocator()), _M_inner._M_tie()); }
196 template<
typename _Alloc>
197 using __outermost_alloc_traits
198 = allocator_traits<typename __outermost_type<_Alloc>::type>;
200 #if ! __cpp_lib_make_obj_using_allocator
201 template<
typename _Tp,
typename... _Args>
203 _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args)
205 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
206 _O_traits::construct(__outermost(*
this), __p,
207 std::forward<_Args>(__args)...);
210 typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_;
211 typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_;
213 template<
typename _Tp,
typename... _Args>
215 _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args)
217 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
218 _O_traits::construct(__outermost(*
this), __p,
219 allocator_arg, inner_allocator(),
220 std::forward<_Args>(__args)...);
223 template<
typename _Tp,
typename... _Args>
225 _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args)
227 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
228 _O_traits::construct(__outermost(*
this), __p,
229 std::forward<_Args>(__args)...,
232 #endif // ! make_obj_using_allocator
234 template<
typename _Alloc>
236 _S_select_on_copy(
const _Alloc& __a)
238 typedef allocator_traits<_Alloc> __a_traits;
239 return __a_traits::select_on_container_copy_construction(__a);
242 template<std::size_t... _Indices>
243 scoped_allocator_adaptor(tuple<
const _OuterAlloc&,
244 const _InnerAllocs&...> __refs,
245 _Index_tuple<_Indices...>)
246 : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))),
247 _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...)
251 template<
typename _Alloc>
252 using _Constructible =
typename enable_if<
253 is_constructible<_OuterAlloc, _Alloc>::value
258 template<
typename _Tp>
259 struct __not_pair {
using type = void; };
261 template<
typename _Tp,
typename _Up>
262 struct __not_pair<pair<_Tp, _Up>> { };
265 typedef _OuterAlloc outer_allocator_type;
266 typedef typename __inner_type::__type inner_allocator_type;
276 typedef typename __or_<
278 typename allocator_traits<_InnerAllocs>::
279 propagate_on_container_copy_assignment...>::type
280 propagate_on_container_copy_assignment;
282 typedef typename __or_<
284 typename allocator_traits<_InnerAllocs>::
285 propagate_on_container_move_assignment...>::type
286 propagate_on_container_move_assignment;
288 typedef typename __or_<
290 typename allocator_traits<_InnerAllocs>::
291 propagate_on_container_swap...>::type
292 propagate_on_container_swap;
294 typedef typename __and_<
296 typename allocator_traits<_InnerAllocs>::is_always_equal...>::type
302 typedef scoped_allocator_adaptor<
303 typename __traits::template rebind_alloc<_Tp>,
304 _InnerAllocs...> other;
307 scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { }
309 template<
typename _Outer2,
typename = _Constructible<_Outer2>>
310 scoped_allocator_adaptor(_Outer2&& __outer,
311 const _InnerAllocs&... __inner)
312 : _OuterAlloc(std::
forward<_Outer2>(__outer)),
316 scoped_allocator_adaptor(
const scoped_allocator_adaptor& __other)
317 : _OuterAlloc(__other.outer_allocator()),
318 _M_inner(__other._M_inner)
321 scoped_allocator_adaptor(scoped_allocator_adaptor&& __other)
322 : _OuterAlloc(std::
move(__other.outer_allocator())),
323 _M_inner(std::
move(__other._M_inner))
326 template<
typename _Outer2,
typename = _Constructible<const _Outer2&>>
327 scoped_allocator_adaptor(
328 const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other)
329 : _OuterAlloc(__other.outer_allocator()),
330 _M_inner(__other._M_inner)
333 template<
typename _Outer2,
typename = _Constructible<_Outer2>>
334 scoped_allocator_adaptor(
335 scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other)
336 : _OuterAlloc(std::
move(__other.outer_allocator())),
337 _M_inner(std::
move(__other._M_inner))
340 scoped_allocator_adaptor&
341 operator=(
const scoped_allocator_adaptor&) =
default;
343 scoped_allocator_adaptor&
344 operator=(scoped_allocator_adaptor&&) =
default;
346 inner_allocator_type& inner_allocator() noexcept
347 {
return _M_inner._M_get(
this); }
349 const inner_allocator_type& inner_allocator() const noexcept
350 {
return _M_inner._M_get(
this); }
352 outer_allocator_type& outer_allocator() noexcept
353 {
return static_cast<_OuterAlloc&
>(*this); }
355 const outer_allocator_type& outer_allocator() const noexcept
356 {
return static_cast<const _OuterAlloc&
>(*this); }
358 _GLIBCXX_NODISCARD pointer allocate(size_type __n)
359 {
return __traits::allocate(outer_allocator(), __n); }
361 _GLIBCXX_NODISCARD pointer allocate(size_type __n, const_void_pointer __hint)
362 {
return __traits::allocate(outer_allocator(), __n, __hint); }
364 void deallocate(pointer __p, size_type __n)
367 size_type max_size()
const
370 #if ! __cpp_lib_make_obj_using_allocator
371 template<
typename _Tp,
typename... _Args>
372 typename __not_pair<_Tp>::type
373 construct(_Tp* __p, _Args&&... __args)
375 auto& __inner = inner_allocator();
377 = std::__use_alloc<_Tp, inner_allocator_type, _Args...>(__inner);
378 _M_construct(__use_tag, __p, std::forward<_Args>(__args)...);
381 template<
typename _T1,
typename _T2,
typename... _Args1,
384 construct(pair<_T1, _T2>* __p, piecewise_construct_t,
385 tuple<_Args1...> __x, tuple<_Args2...> __y)
389 auto& __inner = inner_allocator();
391 = std::__use_alloc<_T1, inner_allocator_type, _Args1...>(__inner);
393 = std::__use_alloc<_T2, inner_allocator_type, _Args2...>(__inner);
394 typename _Build_index_tuple<
sizeof...(_Args1)>::__type __x_indices;
395 typename _Build_index_tuple<
sizeof...(_Args2)>::__type __y_indices;
396 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
398 _M_construct_p(__x_use_tag, __x_indices, __x),
399 _M_construct_p(__y_use_tag, __y_indices, __y));
402 template<
typename _T1,
typename _T2>
404 construct(pair<_T1, _T2>* __p)
407 template<
typename _T1,
typename _T2,
typename _Up,
typename _Vp>
409 construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v)
416 template<
typename _T1,
typename _T2,
typename _Up,
typename _Vp>
418 construct(pair<_T1, _T2>* __p,
const pair<_Up, _Vp>& __x)
425 template<
typename _T1,
typename _T2,
typename _Up,
typename _Vp>
427 construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x)
433 #else // make_obj_using_allocator
434 template<
typename _Tp,
typename... _Args>
435 __attribute__((__nonnull__))
437 construct(_Tp* __p, _Args&&... __args)
439 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
440 std::apply([__p,
this](
auto&&... __newargs) {
441 _O_traits::construct(__outermost(*
this), __p,
444 uses_allocator_construction_args<_Tp>(inner_allocator(),
445 std::forward<_Args>(__args)...));
449 template<
typename _Tp>
450 void destroy(_Tp* __p)
452 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
453 _O_traits::destroy(__outermost(*
this), __p);
456 scoped_allocator_adaptor
457 select_on_container_copy_construction()
const
459 typedef typename _Build_index_tuple<
sizeof...(_InnerAllocs)>::__type
461 return scoped_allocator_adaptor(_M_tie(), _Indices());
464 template <
typename _OutA1,
typename _OutA2,
typename... _InA>
466 operator==(
const scoped_allocator_adaptor<_OutA1, _InA...>& __a,
467 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept;
470 #if ! __cpp_lib_make_obj_using_allocator
471 template<
typename _Ind,
typename... _Args>
473 _M_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t)
476 template<
size_t... _Ind,
typename... _Args>
477 tuple<allocator_arg_t, inner_allocator_type&, _Args&&...>
478 _M_construct_p(__uses_alloc1_, _Index_tuple<_Ind...>,
479 tuple<_Args...>& __t)
481 return { allocator_arg, inner_allocator(),
486 template<
size_t... _Ind,
typename... _Args>
487 tuple<_Args&&..., inner_allocator_type&>
488 _M_construct_p(__uses_alloc2_, _Index_tuple<_Ind...>,
489 tuple<_Args...>& __t)
491 return { std::get<_Ind>(
std::move(__t))..., inner_allocator() };
493 #endif // ! make_obj_using_allocator
497 template <
typename _OutA1,
typename _OutA2,
typename... _InA>
502 return __a.outer_allocator() == __b.outer_allocator()
503 && __a._M_inner == __b._M_inner;
506 #if __cpp_impl_three_way_comparison < 201907L
508 template <
typename _OutA1,
typename _OutA2,
typename... _InA>
512 {
return !(__a == __b); }
517 _GLIBCXX_END_NAMESPACE_VERSION
522 #endif // _SCOPED_ALLOCATOR
constexpr tuple< _Elements &...> tie(_Elements &...__args) noexcept
tie
__detected_or_t< false_type, __pocs, _Alloc > propagate_on_container_swap
How the allocator is propagated on swap.
typename _Ptr< __cv_pointer, const void >::type const_void_pointer
The allocator's const void pointer type.
constexpr tuple< _Elements &&...> forward_as_tuple(_Elements &&...__args) noexcept
std::forward_as_tuple
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
static constexpr void deallocate(_Alloc &__a, pointer __p, size_type __n)
Deallocate memory.
__detected_or_t< false_type, __pocma, _Alloc > propagate_on_container_move_assignment
How the allocator is propagated on move assignment.
_Alloc::value_type value_type
The allocated type.
typename _Ptr< __c_pointer, const value_type >::type const_pointer
The allocator's const pointer type.
typename _Diff< _Alloc, pointer >::type difference_type
The allocator's difference type.
static constexpr size_type max_size(const _Alloc &__a) noexcept
The maximum supported allocation size.
bool operator==(const scoped_allocator_adaptor< _OutA1, _InA...> &__a, const scoped_allocator_adaptor< _OutA2, _InA...> &__b) noexcept
__detected_or_t< value_type *, __pointer, _Alloc > pointer
The allocator's pointer type.
__detected_or_t< typename is_empty< _Alloc >::type, __equal, _Alloc > is_always_equal
Whether all instances of the allocator type compare equal.
typename _Size< _Alloc, difference_type >::type size_type
The allocator's size type.
typename _Ptr< __v_pointer, void >::type void_pointer
The allocator's void pointer type.
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
constexpr _Iterator __base(_Iterator __it)
__detected_or_t< false_type, __pocca, _Alloc > propagate_on_container_copy_assignment
How the allocator is propagated on copy assignment.
An adaptor to recursively pass an allocator to the objects it constructs.
constexpr piecewise_construct_t piecewise_construct
Tag for piecewise construction of std::pair objects.