libstdc++
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00001 // <scoped_allocator> -*- C++ -*- 00002 00003 // Copyright (C) 2011-2018 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 <utility> 00039 #include <tuple> 00040 #include <bits/alloc_traits.h> 00041 00042 namespace std _GLIBCXX_VISIBILITY(default) 00043 { 00044 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00045 00046 /** 00047 * @addtogroup allocators 00048 * @{ 00049 */ 00050 00051 template<typename _Alloc> 00052 using __outer_allocator_t 00053 = decltype(std::declval<_Alloc>().outer_allocator()); 00054 00055 template<typename _Alloc, typename = void> 00056 struct __outermost_type 00057 { 00058 using type = _Alloc; 00059 static type& _S_outermost(_Alloc& __a) { return __a; } 00060 }; 00061 00062 template<typename _Alloc> 00063 struct __outermost_type<_Alloc, __void_t<__outer_allocator_t<_Alloc>>> 00064 : __outermost_type< 00065 typename remove_reference<__outer_allocator_t<_Alloc>>::type 00066 > 00067 { 00068 using __base = __outermost_type< 00069 typename remove_reference<__outer_allocator_t<_Alloc>>::type 00070 >; 00071 00072 static typename __base::type& 00073 _S_outermost(_Alloc& __a) 00074 { return __base::_S_outermost(__a.outer_allocator()); } 00075 }; 00076 00077 template<typename _Alloc> 00078 inline typename __outermost_type<_Alloc>::type& 00079 __outermost(_Alloc& __a) 00080 { return __outermost_type<_Alloc>::_S_outermost(__a); } 00081 00082 template<typename _OuterAlloc, typename... _InnerAllocs> 00083 class scoped_allocator_adaptor; 00084 00085 template<typename...> 00086 struct __inner_type_impl; 00087 00088 template<typename _Outer> 00089 struct __inner_type_impl<_Outer> 00090 { 00091 typedef scoped_allocator_adaptor<_Outer> __type; 00092 00093 __inner_type_impl() = default; 00094 __inner_type_impl(const __inner_type_impl&) = default; 00095 __inner_type_impl(__inner_type_impl&&) = default; 00096 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00097 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00098 00099 template<typename _Alloc> 00100 __inner_type_impl(const __inner_type_impl<_Alloc>& __other) 00101 { } 00102 00103 template<typename _Alloc> 00104 __inner_type_impl(__inner_type_impl<_Alloc>&& __other) 00105 { } 00106 00107 __type& 00108 _M_get(__type* __p) noexcept { return *__p; } 00109 00110 const __type& 00111 _M_get(const __type* __p) const noexcept { return *__p; } 00112 00113 tuple<> 00114 _M_tie() const noexcept { return tuple<>(); } 00115 00116 bool 00117 operator==(const __inner_type_impl&) const noexcept 00118 { return true; } 00119 }; 00120 00121 template<typename _Outer, typename _InnerHead, typename... _InnerTail> 00122 struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...> 00123 { 00124 typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type; 00125 00126 __inner_type_impl() = default; 00127 __inner_type_impl(const __inner_type_impl&) = default; 00128 __inner_type_impl(__inner_type_impl&&) = default; 00129 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00130 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00131 00132 template<typename... _Allocs> 00133 __inner_type_impl(const __inner_type_impl<_Allocs...>& __other) 00134 : _M_inner(__other._M_inner) { } 00135 00136 template<typename... _Allocs> 00137 __inner_type_impl(__inner_type_impl<_Allocs...>&& __other) 00138 : _M_inner(std::move(__other._M_inner)) { } 00139 00140 template<typename... _Args> 00141 explicit 00142 __inner_type_impl(_Args&&... __args) 00143 : _M_inner(std::forward<_Args>(__args)...) { } 00144 00145 __type& 00146 _M_get(void*) noexcept { return _M_inner; } 00147 00148 const __type& 00149 _M_get(const void*) const noexcept { return _M_inner; } 00150 00151 tuple<const _InnerHead&, const _InnerTail&...> 00152 _M_tie() const noexcept 00153 { return _M_inner._M_tie(); } 00154 00155 bool 00156 operator==(const __inner_type_impl& __other) const noexcept 00157 { return _M_inner == __other._M_inner; } 00158 00159 private: 00160 template<typename...> friend class __inner_type_impl; 00161 template<typename, typename...> friend class scoped_allocator_adaptor; 00162 00163 __type _M_inner; 00164 }; 00165 00166 /// Primary class template. 00167 template<typename _OuterAlloc, typename... _InnerAllocs> 00168 class scoped_allocator_adaptor 00169 : public _OuterAlloc 00170 { 00171 typedef allocator_traits<_OuterAlloc> __traits; 00172 00173 typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type; 00174 __inner_type _M_inner; 00175 00176 template<typename _Outer, typename... _Inner> 00177 friend class scoped_allocator_adaptor; 00178 00179 template<typename...> 00180 friend class __inner_type_impl; 00181 00182 tuple<const _OuterAlloc&, const _InnerAllocs&...> 00183 _M_tie() const noexcept 00184 { return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); } 00185 00186 template<typename _Alloc> 00187 using __outermost_alloc_traits 00188 = allocator_traits<typename __outermost_type<_Alloc>::type>; 00189 00190 template<typename _Tp, typename... _Args> 00191 void 00192 _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args) 00193 { 00194 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00195 _O_traits::construct(__outermost(*this), __p, 00196 std::forward<_Args>(__args)...); 00197 } 00198 00199 typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_; 00200 typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_; 00201 00202 template<typename _Tp, typename... _Args> 00203 void 00204 _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args) 00205 { 00206 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00207 _O_traits::construct(__outermost(*this), __p, 00208 allocator_arg, inner_allocator(), 00209 std::forward<_Args>(__args)...); 00210 } 00211 00212 template<typename _Tp, typename... _Args> 00213 void 00214 _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args) 00215 { 00216 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00217 _O_traits::construct(__outermost(*this), __p, 00218 std::forward<_Args>(__args)..., 00219 inner_allocator()); 00220 } 00221 00222 template<typename _Alloc> 00223 static _Alloc 00224 _S_select_on_copy(const _Alloc& __a) 00225 { 00226 typedef allocator_traits<_Alloc> __a_traits; 00227 return __a_traits::select_on_container_copy_construction(__a); 00228 } 00229 00230 template<std::size_t... _Indices> 00231 scoped_allocator_adaptor(tuple<const _OuterAlloc&, 00232 const _InnerAllocs&...> __refs, 00233 _Index_tuple<_Indices...>) 00234 : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))), 00235 _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...) 00236 { } 00237 00238 // Used to constrain constructors to disallow invalid conversions. 00239 template<typename _Alloc> 00240 using _Constructible = typename enable_if< 00241 is_constructible<_OuterAlloc, _Alloc>::value 00242 >::type; 00243 00244 public: 00245 typedef _OuterAlloc outer_allocator_type; 00246 typedef typename __inner_type::__type inner_allocator_type; 00247 00248 typedef typename __traits::value_type value_type; 00249 typedef typename __traits::size_type size_type; 00250 typedef typename __traits::difference_type difference_type; 00251 typedef typename __traits::pointer pointer; 00252 typedef typename __traits::const_pointer const_pointer; 00253 typedef typename __traits::void_pointer void_pointer; 00254 typedef typename __traits::const_void_pointer const_void_pointer; 00255 00256 typedef typename __or_< 00257 typename __traits::propagate_on_container_copy_assignment, 00258 typename allocator_traits<_InnerAllocs>:: 00259 propagate_on_container_copy_assignment...>::type 00260 propagate_on_container_copy_assignment; 00261 00262 typedef typename __or_< 00263 typename __traits::propagate_on_container_move_assignment, 00264 typename allocator_traits<_InnerAllocs>:: 00265 propagate_on_container_move_assignment...>::type 00266 propagate_on_container_move_assignment; 00267 00268 typedef typename __or_< 00269 typename __traits::propagate_on_container_swap, 00270 typename allocator_traits<_InnerAllocs>:: 00271 propagate_on_container_swap...>::type 00272 propagate_on_container_swap; 00273 00274 typedef typename __and_< 00275 typename __traits::is_always_equal, 00276 typename allocator_traits<_InnerAllocs>::is_always_equal...>::type 00277 is_always_equal; 00278 00279 template <class _Tp> 00280 struct rebind 00281 { 00282 typedef scoped_allocator_adaptor< 00283 typename __traits::template rebind_alloc<_Tp>, 00284 _InnerAllocs...> other; 00285 }; 00286 00287 scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { } 00288 00289 template<typename _Outer2, typename = _Constructible<_Outer2>> 00290 scoped_allocator_adaptor(_Outer2&& __outer, 00291 const _InnerAllocs&... __inner) 00292 : _OuterAlloc(std::forward<_Outer2>(__outer)), 00293 _M_inner(__inner...) 00294 { } 00295 00296 scoped_allocator_adaptor(const scoped_allocator_adaptor& __other) 00297 : _OuterAlloc(__other.outer_allocator()), 00298 _M_inner(__other._M_inner) 00299 { } 00300 00301 scoped_allocator_adaptor(scoped_allocator_adaptor&& __other) 00302 : _OuterAlloc(std::move(__other.outer_allocator())), 00303 _M_inner(std::move(__other._M_inner)) 00304 { } 00305 00306 template<typename _Outer2, typename = _Constructible<const _Outer2&>> 00307 scoped_allocator_adaptor( 00308 const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other) 00309 : _OuterAlloc(__other.outer_allocator()), 00310 _M_inner(__other._M_inner) 00311 { } 00312 00313 template<typename _Outer2, typename = _Constructible<_Outer2>> 00314 scoped_allocator_adaptor( 00315 scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other) 00316 : _OuterAlloc(std::move(__other.outer_allocator())), 00317 _M_inner(std::move(__other._M_inner)) 00318 { } 00319 00320 scoped_allocator_adaptor& 00321 operator=(const scoped_allocator_adaptor&) = default; 00322 00323 scoped_allocator_adaptor& 00324 operator=(scoped_allocator_adaptor&&) = default; 00325 00326 inner_allocator_type& inner_allocator() noexcept 00327 { return _M_inner._M_get(this); } 00328 00329 const inner_allocator_type& inner_allocator() const noexcept 00330 { return _M_inner._M_get(this); } 00331 00332 outer_allocator_type& outer_allocator() noexcept 00333 { return static_cast<_OuterAlloc&>(*this); } 00334 00335 const outer_allocator_type& outer_allocator() const noexcept 00336 { return static_cast<const _OuterAlloc&>(*this); } 00337 00338 pointer allocate(size_type __n) 00339 { return __traits::allocate(outer_allocator(), __n); } 00340 00341 pointer allocate(size_type __n, const_void_pointer __hint) 00342 { return __traits::allocate(outer_allocator(), __n, __hint); } 00343 00344 void deallocate(pointer __p, size_type __n) 00345 { return __traits::deallocate(outer_allocator(), __p, __n); } 00346 00347 size_type max_size() const 00348 { return __traits::max_size(outer_allocator()); } 00349 00350 template<typename _Tp, typename... _Args> 00351 void construct(_Tp* __p, _Args&&... __args) 00352 { 00353 auto& __inner = inner_allocator(); 00354 auto __use_tag 00355 = __use_alloc<_Tp, inner_allocator_type, _Args...>(__inner); 00356 _M_construct(__use_tag, __p, std::forward<_Args>(__args)...); 00357 } 00358 00359 template<typename _T1, typename _T2, typename... _Args1, 00360 typename... _Args2> 00361 void 00362 construct(pair<_T1, _T2>* __p, piecewise_construct_t, 00363 tuple<_Args1...> __x, tuple<_Args2...> __y) 00364 { 00365 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00366 // 2203. wrong argument types for piecewise construction 00367 auto& __inner = inner_allocator(); 00368 auto __x_use_tag 00369 = __use_alloc<_T1, inner_allocator_type, _Args1...>(__inner); 00370 auto __y_use_tag 00371 = __use_alloc<_T2, inner_allocator_type, _Args2...>(__inner); 00372 typename _Build_index_tuple<sizeof...(_Args1)>::__type __x_indices; 00373 typename _Build_index_tuple<sizeof...(_Args2)>::__type __y_indices; 00374 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00375 _O_traits::construct(__outermost(*this), __p, piecewise_construct, 00376 _M_construct_p(__x_use_tag, __x_indices, __x), 00377 _M_construct_p(__y_use_tag, __y_indices, __y)); 00378 } 00379 00380 template<typename _T1, typename _T2> 00381 void 00382 construct(pair<_T1, _T2>* __p) 00383 { construct(__p, piecewise_construct, tuple<>(), tuple<>()); } 00384 00385 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00386 void 00387 construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v) 00388 { 00389 construct(__p, piecewise_construct, 00390 std::forward_as_tuple(std::forward<_Up>(__u)), 00391 std::forward_as_tuple(std::forward<_Vp>(__v))); 00392 } 00393 00394 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00395 void 00396 construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x) 00397 { 00398 construct(__p, piecewise_construct, 00399 std::forward_as_tuple(__x.first), 00400 std::forward_as_tuple(__x.second)); 00401 } 00402 00403 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00404 void 00405 construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x) 00406 { 00407 construct(__p, piecewise_construct, 00408 std::forward_as_tuple(std::forward<_Up>(__x.first)), 00409 std::forward_as_tuple(std::forward<_Vp>(__x.second))); 00410 } 00411 00412 template<typename _Tp> 00413 void destroy(_Tp* __p) 00414 { 00415 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00416 _O_traits::destroy(__outermost(*this), __p); 00417 } 00418 00419 scoped_allocator_adaptor 00420 select_on_container_copy_construction() const 00421 { 00422 typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type 00423 _Indices; 00424 return scoped_allocator_adaptor(_M_tie(), _Indices()); 00425 } 00426 00427 template <typename _OutA1, typename _OutA2, typename... _InA> 00428 friend bool 00429 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00430 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept; 00431 00432 private: 00433 template<typename _Ind, typename... _Args> 00434 tuple<_Args&&...> 00435 _M_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t) 00436 { return std::move(__t); } 00437 00438 template<size_t... _Ind, typename... _Args> 00439 tuple<allocator_arg_t, inner_allocator_type&, _Args&&...> 00440 _M_construct_p(__uses_alloc1_, _Index_tuple<_Ind...>, 00441 tuple<_Args...>& __t) 00442 { 00443 return { allocator_arg, inner_allocator(), 00444 std::get<_Ind>(std::move(__t))... 00445 }; 00446 } 00447 00448 template<size_t... _Ind, typename... _Args> 00449 tuple<_Args&&..., inner_allocator_type&> 00450 _M_construct_p(__uses_alloc2_, _Index_tuple<_Ind...>, 00451 tuple<_Args...>& __t) 00452 { 00453 return { std::get<_Ind>(std::move(__t))..., inner_allocator() }; 00454 } 00455 }; 00456 00457 template <typename _OutA1, typename _OutA2, typename... _InA> 00458 inline bool 00459 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00460 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00461 { 00462 return __a.outer_allocator() == __b.outer_allocator() 00463 && __a._M_inner == __b._M_inner; 00464 } 00465 00466 template <typename _OutA1, typename _OutA2, typename... _InA> 00467 inline bool 00468 operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00469 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00470 { return !(__a == __b); } 00471 00472 /// @} 00473 00474 _GLIBCXX_END_NAMESPACE_VERSION 00475 } // namespace 00476 00477 #endif // C++11 00478 00479 #endif // _SCOPED_ALLOCATOR