1 // <scoped_allocator> -*- C++ -*- 2 3 // Copyright (C) 2011, 2012 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file include/scoped_allocator 26 * This is a Standard C++ Library header. 27 */ 28 29 #ifndef _SCOPED_ALLOCATOR 30 #define _SCOPED_ALLOCATOR 1 31 32 #pragma GCC system_header 33 34 #ifndef __GXX_EXPERIMENTAL_CXX0X__ 35 # include <bits/c++0x_warning.h> 36 #else 37 38 #include <utility> 39 #include <tuple> 40 #include <bits/alloc_traits.h> 41 42 namespace std _GLIBCXX_VISIBILITY(default) 43 { 44 _GLIBCXX_BEGIN_NAMESPACE_VERSION 45 46 template<template<typename> class _Pred, typename... _Allocs> 47 struct __any_of; 48 49 template<template<typename> class _Pred, typename _Alloc, typename... _Allocs> 50 struct __any_of<_Pred, _Alloc, _Allocs...> 51 : __or_<_Pred<_Alloc>, __any_of<_Pred, _Allocs...>> 52 { }; 53 54 template<template<typename> class _Pred, typename _Alloc> 55 struct __any_of<_Pred, _Alloc> 56 : _Pred<_Alloc> 57 { }; 58 59 /** 60 * @addtogroup allocators 61 * @{ 62 */ 63 64 template<typename _Alloc> 65 struct __propagate_on_copy 66 : allocator_traits<_Alloc>::propagate_on_container_copy_assignment 67 { }; 68 template<typename _Alloc> 69 struct __propagate_on_move 70 : allocator_traits<_Alloc>::propagate_on_container_move_assignment 71 { }; 72 template<typename _Alloc> 73 struct __propagate_on_swap 74 : allocator_traits<_Alloc>::propagate_on_container_swap 75 { }; 76 77 78 template<typename _Alloc> 79 inline auto 80 __do_outermost(_Alloc& __a, _Alloc*) -> decltype(__a.outer_allocator()) 81 { return __a.outer_allocator(); } 82 83 template<typename _Alloc> 84 inline _Alloc& 85 __do_outermost(_Alloc& __a, ...) 86 { return __a; } 87 88 template<typename _Alloc> 89 inline auto 90 __outermost(_Alloc& __a) -> decltype(__do_outermost(__a, &__a)) 91 { return __do_outermost(__a, &__a); } 92 93 template<typename _OuterAlloc, typename... _InnerAllocs> 94 class scoped_allocator_adaptor; 95 96 template<typename...> 97 struct __inner_type_impl; 98 99 template<typename _Outer> 100 struct __inner_type_impl<_Outer> 101 { 102 typedef scoped_allocator_adaptor<_Outer> __type; 103 104 __inner_type_impl() = default; 105 __inner_type_impl(const __inner_type_impl&) = default; 106 __inner_type_impl(__inner_type_impl&&) = default; 107 108 template<typename _Alloc> 109 __inner_type_impl(const __inner_type_impl<_Alloc>& __other) 110 { } 111 112 template<typename _Alloc> 113 __inner_type_impl(__inner_type_impl<_Alloc>&& __other) 114 { } 115 116 __type& 117 _M_get(__type* __p) noexcept { return *__p; } 118 119 const __type& 120 _M_get(const __type* __p) const noexcept { return *__p; } 121 122 tuple<> 123 _M_tie() const noexcept { return tuple<>(); } 124 125 bool 126 operator==(const __inner_type_impl&) const noexcept 127 { return true; } 128 }; 129 130 template<typename _Outer, typename _InnerHead, typename... _InnerTail> 131 struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...> 132 { 133 typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type; 134 135 __inner_type_impl() = default; 136 __inner_type_impl(const __inner_type_impl&) = default; 137 __inner_type_impl(__inner_type_impl&&) = default; 138 139 template<typename... _Allocs> 140 __inner_type_impl(const __inner_type_impl<_Allocs...>& __other) 141 : _M_inner(__other._M_inner) { } 142 143 template<typename... _Allocs> 144 __inner_type_impl(__inner_type_impl<_Allocs...>&& __other) 145 : _M_inner(std::move(__other._M_inner)) { } 146 147 template<typename... _Args> 148 explicit 149 __inner_type_impl(_Args&&... __args) 150 : _M_inner(std::forward<_Args>(__args)...) { } 151 152 __type& 153 _M_get(void*) noexcept { return _M_inner; } 154 155 const __type& 156 _M_get(const void*) const noexcept { return _M_inner; } 157 158 tuple<const _InnerHead&, const _InnerTail&...> 159 _M_tie() const noexcept 160 { return _M_inner._M_tie(); } 161 162 bool 163 operator==(const __inner_type_impl& __other) const noexcept 164 { return _M_inner == __other._M_inner; } 165 166 private: 167 template<typename...> friend class __inner_type_impl; 168 template<typename, typename...> friend class scoped_allocator_adaptor; 169 170 __type _M_inner; 171 }; 172 173 /// Primary class template. 174 template<typename _OuterAlloc, typename... _InnerAllocs> 175 class scoped_allocator_adaptor 176 : public _OuterAlloc 177 { 178 typedef allocator_traits<_OuterAlloc> __traits; 179 180 typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type; 181 __inner_type _M_inner; 182 183 template<typename _Outer, typename... _Inner> 184 friend class scoped_allocator_adaptor; 185 186 template<typename...> 187 friend class __inner_type_impl; 188 189 tuple<const _OuterAlloc&, const _InnerAllocs&...> 190 _M_tie() const noexcept 191 { return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); } 192 193 194 template<typename _Tp, typename... _Args> 195 void 196 _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args) 197 { 198 auto& __outer = __outermost(*this); 199 typedef typename std::decay<decltype(__outer)>::type __outer_type; 200 typedef allocator_traits<__outer_type> __o_traits; 201 __o_traits::construct(__outer, __p, std::forward<_Args>(__args)...); 202 } 203 204 typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_; 205 typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_; 206 207 template<typename _Tp, typename... _Args> 208 void 209 _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args) 210 { 211 auto& __outer = __outermost(*this); 212 typedef typename std::decay<decltype(__outer)>::type __outer_type; 213 typedef allocator_traits<__outer_type> __o_traits; 214 __o_traits::construct(__outer, __p, allocator_arg, inner_allocator(), 215 std::forward<_Args>(__args)...); 216 } 217 218 template<typename _Tp, typename... _Args> 219 void 220 _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args) 221 { 222 auto& __outer = __outermost(*this); 223 typedef typename std::decay<decltype(__outer)>::type __outer_type; 224 typedef allocator_traits<__outer_type> __o_traits; 225 __o_traits::construct(__outer, __p, std::forward<_Args>(__args)..., 226 inner_allocator()); 227 } 228 229 template<typename _Alloc> 230 static _Alloc 231 _S_select_on_copy(const _Alloc& __a) 232 { 233 typedef allocator_traits<_Alloc> __a_traits; 234 return __a_traits::select_on_container_copy_construction(__a); 235 } 236 237 template<std::size_t... _Indices> 238 scoped_allocator_adaptor(tuple<const _OuterAlloc&, 239 const _InnerAllocs&...> __refs, 240 _Index_tuple<_Indices...>) 241 : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))), 242 _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...) 243 { } 244 245 public: 246 typedef _OuterAlloc outer_allocator_type; 247 typedef typename __inner_type::__type inner_allocator_type; 248 249 typedef typename __traits::value_type value_type; 250 typedef typename __traits::size_type size_type; 251 typedef typename __traits::difference_type difference_type; 252 typedef typename __traits::pointer pointer; 253 typedef typename __traits::const_pointer const_pointer; 254 typedef typename __traits::void_pointer void_pointer; 255 typedef typename __traits::const_void_pointer const_void_pointer; 256 257 typedef typename conditional< 258 __any_of<__propagate_on_copy, _OuterAlloc, _InnerAllocs...>::value, 259 true_type, false_type>::type propagate_on_container_copy_assignment; 260 typedef typename conditional< 261 __any_of<__propagate_on_move, _OuterAlloc, _InnerAllocs...>::value, 262 true_type, false_type>::type propagate_on_container_move_assignment; 263 typedef typename conditional< 264 __any_of<__propagate_on_swap, _OuterAlloc, _InnerAllocs...>::value, 265 true_type, false_type>::type propagate_on_container_swap; 266 267 template <class _Tp> 268 struct rebind 269 { 270 typedef scoped_allocator_adaptor< 271 typename __traits::template rebind_alloc<_Tp>, 272 _InnerAllocs...> other; 273 }; 274 275 scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { } 276 277 template<typename _Outer2> 278 scoped_allocator_adaptor(_Outer2&& __outer, 279 const _InnerAllocs&... __inner) 280 : _OuterAlloc(std::forward<_Outer2>(__outer)), 281 _M_inner(__inner...) 282 { } 283 284 scoped_allocator_adaptor(const scoped_allocator_adaptor& __other) 285 : _OuterAlloc(__other.outer_allocator()), 286 _M_inner(__other._M_inner) 287 { } 288 289 scoped_allocator_adaptor(scoped_allocator_adaptor&& __other) 290 : _OuterAlloc(std::move(__other.outer_allocator())), 291 _M_inner(std::move(__other._M_inner)) 292 { } 293 294 template<typename _Outer2> 295 scoped_allocator_adaptor( 296 const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other) 297 : _OuterAlloc(__other.outer_allocator()), 298 _M_inner(__other._M_inner) 299 { } 300 301 template<typename _Outer2> 302 scoped_allocator_adaptor( 303 scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other) 304 : _OuterAlloc(std::move(__other.outer_allocator())), 305 _M_inner(std::move(__other._M_inner)) 306 { } 307 308 inner_allocator_type& inner_allocator() noexcept 309 { return _M_inner._M_get(this); } 310 311 const inner_allocator_type& inner_allocator() const noexcept 312 { return _M_inner._M_get(this); } 313 314 outer_allocator_type& outer_allocator() noexcept 315 { return static_cast<_OuterAlloc&>(*this); } 316 317 const outer_allocator_type& outer_allocator() const noexcept 318 { return static_cast<const _OuterAlloc&>(*this); } 319 320 pointer allocate(size_type __n) 321 { return __traits::allocate(outer_allocator(), __n); } 322 323 pointer allocate(size_type __n, const_void_pointer __hint) 324 { return __traits::allocate(outer_allocator(), __n, __hint); } 325 326 void deallocate(pointer __p, size_type __n) 327 { return __traits::deallocate(outer_allocator(), __p, __n); } 328 329 size_type max_size() const 330 { return __traits::max_size(outer_allocator()); } 331 332 template<typename _Tp, typename... _Args> 333 void construct(_Tp* __p, _Args&&... __args) 334 { 335 auto& __inner = inner_allocator(); 336 auto __use_tag 337 = __use_alloc<_Tp, inner_allocator_type, _Args...>(__inner); 338 _M_construct(__use_tag, __p, std::forward<_Args>(__args)...); 339 } 340 341 // TODO: construct pairs 342 343 template<typename _Tp> 344 void destroy(_Tp* __p) 345 { 346 auto& __outer = __outermost(*this); 347 typedef typename std::decay<decltype(__outer)>::type __outer_type; 348 allocator_traits<__outer_type>::destroy(__outer, __p); 349 } 350 351 scoped_allocator_adaptor 352 select_on_container_copy_construction() const 353 { 354 typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type 355 _Indices; 356 return scoped_allocator_adaptor(_M_tie(), _Indices()); 357 } 358 359 template <typename _OutA1, typename _OutA2, typename... _InA> 360 friend bool 361 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 362 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept; 363 }; 364 365 template <typename _OutA1, typename _OutA2, typename... _InA> 366 inline bool 367 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 368 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 369 { 370 return __a.outer_allocator() == __b.outer_allocator() 371 && __a._M_inner == __b._M_inner; 372 } 373 374 template <typename _OutA1, typename _OutA2, typename... _InA> 375 inline bool 376 operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 377 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 378 { return !(__a == __b); } 379 380 /// @} 381 382 _GLIBCXX_END_NAMESPACE_VERSION 383 } // namespace 384 385 #endif // __GXX_EXPERIMENTAL_CXX0X__ 386 387 #endif // _SCOPED_ALLOCATOR 388
