libstdc++
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00001 // <scoped_allocator> -*- C++ -*- 00002 00003 // Copyright (C) 2011-2019 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file include/scoped_allocator 00026 * This is a Standard C++ Library header. 00027 */ 00028 00029 #ifndef _SCOPED_ALLOCATOR 00030 #define _SCOPED_ALLOCATOR 1 00031 00032 #pragma GCC system_header 00033 00034 #if __cplusplus < 201103L 00035 # include <bits/c++0x_warning.h> 00036 #else 00037 00038 #include <memory> 00039 #include <utility> 00040 #include <tuple> 00041 #include <bits/alloc_traits.h> 00042 00043 namespace std _GLIBCXX_VISIBILITY(default) 00044 { 00045 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00046 00047 /** 00048 * @addtogroup allocators 00049 * @{ 00050 */ 00051 00052 template<typename _Alloc> 00053 using __outer_allocator_t 00054 = decltype(std::declval<_Alloc>().outer_allocator()); 00055 00056 template<typename _Alloc, typename = void> 00057 struct __outermost_type 00058 { 00059 using type = _Alloc; 00060 static type& _S_outermost(_Alloc& __a) { return __a; } 00061 }; 00062 00063 template<typename _Alloc> 00064 struct __outermost_type<_Alloc, __void_t<__outer_allocator_t<_Alloc>>> 00065 : __outermost_type< 00066 typename remove_reference<__outer_allocator_t<_Alloc>>::type 00067 > 00068 { 00069 using __base = __outermost_type< 00070 typename remove_reference<__outer_allocator_t<_Alloc>>::type 00071 >; 00072 00073 static typename __base::type& 00074 _S_outermost(_Alloc& __a) 00075 { return __base::_S_outermost(__a.outer_allocator()); } 00076 }; 00077 00078 template<typename _Alloc> 00079 inline typename __outermost_type<_Alloc>::type& 00080 __outermost(_Alloc& __a) 00081 { return __outermost_type<_Alloc>::_S_outermost(__a); } 00082 00083 template<typename _OuterAlloc, typename... _InnerAllocs> 00084 class scoped_allocator_adaptor; 00085 00086 template<typename...> 00087 struct __inner_type_impl; 00088 00089 template<typename _Outer> 00090 struct __inner_type_impl<_Outer> 00091 { 00092 typedef scoped_allocator_adaptor<_Outer> __type; 00093 00094 __inner_type_impl() = default; 00095 __inner_type_impl(const __inner_type_impl&) = default; 00096 __inner_type_impl(__inner_type_impl&&) = default; 00097 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00098 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00099 00100 template<typename _Alloc> 00101 __inner_type_impl(const __inner_type_impl<_Alloc>& __other) 00102 { } 00103 00104 template<typename _Alloc> 00105 __inner_type_impl(__inner_type_impl<_Alloc>&& __other) 00106 { } 00107 00108 __type& 00109 _M_get(__type* __p) noexcept { return *__p; } 00110 00111 const __type& 00112 _M_get(const __type* __p) const noexcept { return *__p; } 00113 00114 tuple<> 00115 _M_tie() const noexcept { return tuple<>(); } 00116 00117 bool 00118 operator==(const __inner_type_impl&) const noexcept 00119 { return true; } 00120 }; 00121 00122 template<typename _Outer, typename _InnerHead, typename... _InnerTail> 00123 struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...> 00124 { 00125 typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type; 00126 00127 __inner_type_impl() = default; 00128 __inner_type_impl(const __inner_type_impl&) = default; 00129 __inner_type_impl(__inner_type_impl&&) = default; 00130 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00131 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00132 00133 template<typename... _Allocs> 00134 __inner_type_impl(const __inner_type_impl<_Allocs...>& __other) 00135 : _M_inner(__other._M_inner) { } 00136 00137 template<typename... _Allocs> 00138 __inner_type_impl(__inner_type_impl<_Allocs...>&& __other) 00139 : _M_inner(std::move(__other._M_inner)) { } 00140 00141 template<typename... _Args> 00142 explicit 00143 __inner_type_impl(_Args&&... __args) 00144 : _M_inner(std::forward<_Args>(__args)...) { } 00145 00146 __type& 00147 _M_get(void*) noexcept { return _M_inner; } 00148 00149 const __type& 00150 _M_get(const void*) const noexcept { return _M_inner; } 00151 00152 tuple<const _InnerHead&, const _InnerTail&...> 00153 _M_tie() const noexcept 00154 { return _M_inner._M_tie(); } 00155 00156 bool 00157 operator==(const __inner_type_impl& __other) const noexcept 00158 { return _M_inner == __other._M_inner; } 00159 00160 private: 00161 template<typename...> friend class __inner_type_impl; 00162 template<typename, typename...> friend class scoped_allocator_adaptor; 00163 00164 __type _M_inner; 00165 }; 00166 00167 /// Primary class template. 00168 template<typename _OuterAlloc, typename... _InnerAllocs> 00169 class scoped_allocator_adaptor 00170 : public _OuterAlloc 00171 { 00172 typedef allocator_traits<_OuterAlloc> __traits; 00173 00174 typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type; 00175 __inner_type _M_inner; 00176 00177 template<typename _Outer, typename... _Inner> 00178 friend class scoped_allocator_adaptor; 00179 00180 template<typename...> 00181 friend class __inner_type_impl; 00182 00183 tuple<const _OuterAlloc&, const _InnerAllocs&...> 00184 _M_tie() const noexcept 00185 { return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); } 00186 00187 template<typename _Alloc> 00188 using __outermost_alloc_traits 00189 = allocator_traits<typename __outermost_type<_Alloc>::type>; 00190 00191 #if __cplusplus <= 201703 00192 template<typename _Tp, typename... _Args> 00193 void 00194 _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args) 00195 { 00196 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00197 _O_traits::construct(__outermost(*this), __p, 00198 std::forward<_Args>(__args)...); 00199 } 00200 00201 typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_; 00202 typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_; 00203 00204 template<typename _Tp, typename... _Args> 00205 void 00206 _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args) 00207 { 00208 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00209 _O_traits::construct(__outermost(*this), __p, 00210 allocator_arg, inner_allocator(), 00211 std::forward<_Args>(__args)...); 00212 } 00213 00214 template<typename _Tp, typename... _Args> 00215 void 00216 _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args) 00217 { 00218 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00219 _O_traits::construct(__outermost(*this), __p, 00220 std::forward<_Args>(__args)..., 00221 inner_allocator()); 00222 } 00223 #endif // C++17 00224 00225 template<typename _Alloc> 00226 static _Alloc 00227 _S_select_on_copy(const _Alloc& __a) 00228 { 00229 typedef allocator_traits<_Alloc> __a_traits; 00230 return __a_traits::select_on_container_copy_construction(__a); 00231 } 00232 00233 template<std::size_t... _Indices> 00234 scoped_allocator_adaptor(tuple<const _OuterAlloc&, 00235 const _InnerAllocs&...> __refs, 00236 _Index_tuple<_Indices...>) 00237 : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))), 00238 _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...) 00239 { } 00240 00241 // Used to constrain constructors to disallow invalid conversions. 00242 template<typename _Alloc> 00243 using _Constructible = typename enable_if< 00244 is_constructible<_OuterAlloc, _Alloc>::value 00245 >::type; 00246 00247 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00248 // 2975. Missing case for pair construction in scoped [...] allocators 00249 template<typename _Tp> 00250 struct __not_pair { using type = void; }; 00251 00252 template<typename _Tp, typename _Up> 00253 struct __not_pair<pair<_Tp, _Up>> { }; 00254 00255 public: 00256 typedef _OuterAlloc outer_allocator_type; 00257 typedef typename __inner_type::__type inner_allocator_type; 00258 00259 typedef typename __traits::value_type value_type; 00260 typedef typename __traits::size_type size_type; 00261 typedef typename __traits::difference_type difference_type; 00262 typedef typename __traits::pointer pointer; 00263 typedef typename __traits::const_pointer const_pointer; 00264 typedef typename __traits::void_pointer void_pointer; 00265 typedef typename __traits::const_void_pointer const_void_pointer; 00266 00267 typedef typename __or_< 00268 typename __traits::propagate_on_container_copy_assignment, 00269 typename allocator_traits<_InnerAllocs>:: 00270 propagate_on_container_copy_assignment...>::type 00271 propagate_on_container_copy_assignment; 00272 00273 typedef typename __or_< 00274 typename __traits::propagate_on_container_move_assignment, 00275 typename allocator_traits<_InnerAllocs>:: 00276 propagate_on_container_move_assignment...>::type 00277 propagate_on_container_move_assignment; 00278 00279 typedef typename __or_< 00280 typename __traits::propagate_on_container_swap, 00281 typename allocator_traits<_InnerAllocs>:: 00282 propagate_on_container_swap...>::type 00283 propagate_on_container_swap; 00284 00285 typedef typename __and_< 00286 typename __traits::is_always_equal, 00287 typename allocator_traits<_InnerAllocs>::is_always_equal...>::type 00288 is_always_equal; 00289 00290 template <class _Tp> 00291 struct rebind 00292 { 00293 typedef scoped_allocator_adaptor< 00294 typename __traits::template rebind_alloc<_Tp>, 00295 _InnerAllocs...> other; 00296 }; 00297 00298 scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { } 00299 00300 template<typename _Outer2, typename = _Constructible<_Outer2>> 00301 scoped_allocator_adaptor(_Outer2&& __outer, 00302 const _InnerAllocs&... __inner) 00303 : _OuterAlloc(std::forward<_Outer2>(__outer)), 00304 _M_inner(__inner...) 00305 { } 00306 00307 scoped_allocator_adaptor(const scoped_allocator_adaptor& __other) 00308 : _OuterAlloc(__other.outer_allocator()), 00309 _M_inner(__other._M_inner) 00310 { } 00311 00312 scoped_allocator_adaptor(scoped_allocator_adaptor&& __other) 00313 : _OuterAlloc(std::move(__other.outer_allocator())), 00314 _M_inner(std::move(__other._M_inner)) 00315 { } 00316 00317 template<typename _Outer2, typename = _Constructible<const _Outer2&>> 00318 scoped_allocator_adaptor( 00319 const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other) 00320 : _OuterAlloc(__other.outer_allocator()), 00321 _M_inner(__other._M_inner) 00322 { } 00323 00324 template<typename _Outer2, typename = _Constructible<_Outer2>> 00325 scoped_allocator_adaptor( 00326 scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other) 00327 : _OuterAlloc(std::move(__other.outer_allocator())), 00328 _M_inner(std::move(__other._M_inner)) 00329 { } 00330 00331 scoped_allocator_adaptor& 00332 operator=(const scoped_allocator_adaptor&) = default; 00333 00334 scoped_allocator_adaptor& 00335 operator=(scoped_allocator_adaptor&&) = default; 00336 00337 inner_allocator_type& inner_allocator() noexcept 00338 { return _M_inner._M_get(this); } 00339 00340 const inner_allocator_type& inner_allocator() const noexcept 00341 { return _M_inner._M_get(this); } 00342 00343 outer_allocator_type& outer_allocator() noexcept 00344 { return static_cast<_OuterAlloc&>(*this); } 00345 00346 const outer_allocator_type& outer_allocator() const noexcept 00347 { return static_cast<const _OuterAlloc&>(*this); } 00348 00349 _GLIBCXX_NODISCARD pointer allocate(size_type __n) 00350 { return __traits::allocate(outer_allocator(), __n); } 00351 00352 _GLIBCXX_NODISCARD pointer allocate(size_type __n, const_void_pointer __hint) 00353 { return __traits::allocate(outer_allocator(), __n, __hint); } 00354 00355 void deallocate(pointer __p, size_type __n) 00356 { return __traits::deallocate(outer_allocator(), __p, __n); } 00357 00358 size_type max_size() const 00359 { return __traits::max_size(outer_allocator()); } 00360 00361 #if __cplusplus <= 201703 00362 template<typename _Tp, typename... _Args> 00363 typename __not_pair<_Tp>::type 00364 construct(_Tp* __p, _Args&&... __args) 00365 { 00366 auto& __inner = inner_allocator(); 00367 auto __use_tag 00368 = std::__use_alloc<_Tp, inner_allocator_type, _Args...>(__inner); 00369 _M_construct(__use_tag, __p, std::forward<_Args>(__args)...); 00370 } 00371 00372 template<typename _T1, typename _T2, typename... _Args1, 00373 typename... _Args2> 00374 void 00375 construct(pair<_T1, _T2>* __p, piecewise_construct_t, 00376 tuple<_Args1...> __x, tuple<_Args2...> __y) 00377 { 00378 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00379 // 2203. wrong argument types for piecewise construction 00380 auto& __inner = inner_allocator(); 00381 auto __x_use_tag 00382 = std::__use_alloc<_T1, inner_allocator_type, _Args1...>(__inner); 00383 auto __y_use_tag 00384 = std::__use_alloc<_T2, inner_allocator_type, _Args2...>(__inner); 00385 typename _Build_index_tuple<sizeof...(_Args1)>::__type __x_indices; 00386 typename _Build_index_tuple<sizeof...(_Args2)>::__type __y_indices; 00387 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00388 _O_traits::construct(__outermost(*this), __p, piecewise_construct, 00389 _M_construct_p(__x_use_tag, __x_indices, __x), 00390 _M_construct_p(__y_use_tag, __y_indices, __y)); 00391 } 00392 00393 template<typename _T1, typename _T2> 00394 void 00395 construct(pair<_T1, _T2>* __p) 00396 { construct(__p, piecewise_construct, tuple<>(), tuple<>()); } 00397 00398 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00399 void 00400 construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v) 00401 { 00402 construct(__p, piecewise_construct, 00403 std::forward_as_tuple(std::forward<_Up>(__u)), 00404 std::forward_as_tuple(std::forward<_Vp>(__v))); 00405 } 00406 00407 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00408 void 00409 construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x) 00410 { 00411 construct(__p, piecewise_construct, 00412 std::forward_as_tuple(__x.first), 00413 std::forward_as_tuple(__x.second)); 00414 } 00415 00416 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00417 void 00418 construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x) 00419 { 00420 construct(__p, piecewise_construct, 00421 std::forward_as_tuple(std::forward<_Up>(__x.first)), 00422 std::forward_as_tuple(std::forward<_Vp>(__x.second))); 00423 } 00424 #else // C++2a 00425 template<typename _Tp, typename... _Args> 00426 __attribute__((__nonnull__)) 00427 void 00428 construct(_Tp* __p, _Args&&... __args) 00429 { 00430 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00431 std::apply([__p, this](auto&&... __newargs) { 00432 _O_traits::construct(__outermost(*this), __p, 00433 std::forward<decltype(__newargs)>(__newargs)...); 00434 }, 00435 uses_allocator_construction_args<_Tp>(inner_allocator(), 00436 std::forward<_Args>(__args)...)); 00437 } 00438 #endif // C++2a 00439 00440 template<typename _Tp> 00441 void destroy(_Tp* __p) 00442 { 00443 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00444 _O_traits::destroy(__outermost(*this), __p); 00445 } 00446 00447 scoped_allocator_adaptor 00448 select_on_container_copy_construction() const 00449 { 00450 typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type 00451 _Indices; 00452 return scoped_allocator_adaptor(_M_tie(), _Indices()); 00453 } 00454 00455 template <typename _OutA1, typename _OutA2, typename... _InA> 00456 friend bool 00457 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00458 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept; 00459 00460 private: 00461 #if __cplusplus <= 201703L 00462 template<typename _Ind, typename... _Args> 00463 tuple<_Args&&...> 00464 _M_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t) 00465 { return std::move(__t); } 00466 00467 template<size_t... _Ind, typename... _Args> 00468 tuple<allocator_arg_t, inner_allocator_type&, _Args&&...> 00469 _M_construct_p(__uses_alloc1_, _Index_tuple<_Ind...>, 00470 tuple<_Args...>& __t) 00471 { 00472 return { allocator_arg, inner_allocator(), 00473 std::get<_Ind>(std::move(__t))... 00474 }; 00475 } 00476 00477 template<size_t... _Ind, typename... _Args> 00478 tuple<_Args&&..., inner_allocator_type&> 00479 _M_construct_p(__uses_alloc2_, _Index_tuple<_Ind...>, 00480 tuple<_Args...>& __t) 00481 { 00482 return { std::get<_Ind>(std::move(__t))..., inner_allocator() }; 00483 } 00484 #endif // C++17 00485 }; 00486 00487 template <typename _OutA1, typename _OutA2, typename... _InA> 00488 inline bool 00489 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00490 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00491 { 00492 return __a.outer_allocator() == __b.outer_allocator() 00493 && __a._M_inner == __b._M_inner; 00494 } 00495 00496 template <typename _OutA1, typename _OutA2, typename... _InA> 00497 inline bool 00498 operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00499 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00500 { return !(__a == __b); } 00501 00502 /// @} 00503 00504 _GLIBCXX_END_NAMESPACE_VERSION 00505 } // namespace 00506 00507 #endif // C++11 00508 00509 #endif // _SCOPED_ALLOCATOR