libstdc++
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00001 // <scoped_allocator> -*- C++ -*- 00002 00003 // Copyright (C) 2011-2015 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 template<template<typename> class _Pred, typename... _Allocs> 00047 struct __any_of; 00048 00049 template<template<typename> class _Pred, typename _Alloc, typename... _Allocs> 00050 struct __any_of<_Pred, _Alloc, _Allocs...> 00051 : __or_<_Pred<_Alloc>, __any_of<_Pred, _Allocs...>> 00052 { }; 00053 00054 template<template<typename> class _Pred, typename _Alloc> 00055 struct __any_of<_Pred, _Alloc> 00056 : _Pred<_Alloc> 00057 { }; 00058 00059 /** 00060 * @addtogroup allocators 00061 * @{ 00062 */ 00063 00064 template<typename _Alloc> 00065 struct __propagate_on_copy 00066 : allocator_traits<_Alloc>::propagate_on_container_copy_assignment 00067 { }; 00068 template<typename _Alloc> 00069 struct __propagate_on_move 00070 : allocator_traits<_Alloc>::propagate_on_container_move_assignment 00071 { }; 00072 template<typename _Alloc> 00073 struct __propagate_on_swap 00074 : allocator_traits<_Alloc>::propagate_on_container_swap 00075 { }; 00076 00077 00078 template<typename _Alloc> 00079 inline auto 00080 __do_outermost(_Alloc& __a, _Alloc*) -> decltype(__a.outer_allocator()) 00081 { return __a.outer_allocator(); } 00082 00083 template<typename _Alloc> 00084 inline _Alloc& 00085 __do_outermost(_Alloc& __a, ...) 00086 { return __a; } 00087 00088 // TODO: make recursive (see note in 20.12.4/1) 00089 template<typename _Alloc> 00090 inline auto 00091 __outermost(_Alloc& __a) -> decltype(__do_outermost(__a, &__a)) 00092 { return __do_outermost(__a, &__a); } 00093 00094 template<typename _OuterAlloc, typename... _InnerAllocs> 00095 class scoped_allocator_adaptor; 00096 00097 template<typename...> 00098 struct __inner_type_impl; 00099 00100 template<typename _Outer> 00101 struct __inner_type_impl<_Outer> 00102 { 00103 typedef scoped_allocator_adaptor<_Outer> __type; 00104 00105 __inner_type_impl() = default; 00106 __inner_type_impl(const __inner_type_impl&) = default; 00107 __inner_type_impl(__inner_type_impl&&) = default; 00108 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00109 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00110 00111 template<typename _Alloc> 00112 __inner_type_impl(const __inner_type_impl<_Alloc>& __other) 00113 { } 00114 00115 template<typename _Alloc> 00116 __inner_type_impl(__inner_type_impl<_Alloc>&& __other) 00117 { } 00118 00119 __type& 00120 _M_get(__type* __p) noexcept { return *__p; } 00121 00122 const __type& 00123 _M_get(const __type* __p) const noexcept { return *__p; } 00124 00125 tuple<> 00126 _M_tie() const noexcept { return tuple<>(); } 00127 00128 bool 00129 operator==(const __inner_type_impl&) const noexcept 00130 { return true; } 00131 }; 00132 00133 template<typename _Outer, typename _InnerHead, typename... _InnerTail> 00134 struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...> 00135 { 00136 typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type; 00137 00138 __inner_type_impl() = default; 00139 __inner_type_impl(const __inner_type_impl&) = default; 00140 __inner_type_impl(__inner_type_impl&&) = default; 00141 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00142 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00143 00144 template<typename... _Allocs> 00145 __inner_type_impl(const __inner_type_impl<_Allocs...>& __other) 00146 : _M_inner(__other._M_inner) { } 00147 00148 template<typename... _Allocs> 00149 __inner_type_impl(__inner_type_impl<_Allocs...>&& __other) 00150 : _M_inner(std::move(__other._M_inner)) { } 00151 00152 template<typename... _Args> 00153 explicit 00154 __inner_type_impl(_Args&&... __args) 00155 : _M_inner(std::forward<_Args>(__args)...) { } 00156 00157 __type& 00158 _M_get(void*) noexcept { return _M_inner; } 00159 00160 const __type& 00161 _M_get(const void*) const noexcept { return _M_inner; } 00162 00163 tuple<const _InnerHead&, const _InnerTail&...> 00164 _M_tie() const noexcept 00165 { return _M_inner._M_tie(); } 00166 00167 bool 00168 operator==(const __inner_type_impl& __other) const noexcept 00169 { return _M_inner == __other._M_inner; } 00170 00171 private: 00172 template<typename...> friend class __inner_type_impl; 00173 template<typename, typename...> friend class scoped_allocator_adaptor; 00174 00175 __type _M_inner; 00176 }; 00177 00178 /// Primary class template. 00179 template<typename _OuterAlloc, typename... _InnerAllocs> 00180 class scoped_allocator_adaptor 00181 : public _OuterAlloc 00182 { 00183 typedef allocator_traits<_OuterAlloc> __traits; 00184 00185 typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type; 00186 __inner_type _M_inner; 00187 00188 template<typename _Outer, typename... _Inner> 00189 friend class scoped_allocator_adaptor; 00190 00191 template<typename...> 00192 friend class __inner_type_impl; 00193 00194 tuple<const _OuterAlloc&, const _InnerAllocs&...> 00195 _M_tie() const noexcept 00196 { return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); } 00197 00198 template<typename _Alloc> 00199 using __outermost_type = typename 00200 std::decay<decltype(__outermost(std::declval<_Alloc&>()))>::type; 00201 00202 template<typename _Alloc> 00203 using __outermost_alloc_traits 00204 = allocator_traits<__outermost_type<_Alloc>>; 00205 00206 template<typename _Tp, typename... _Args> 00207 void 00208 _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args) 00209 { 00210 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00211 _O_traits::construct(__outermost(*this), __p, 00212 std::forward<_Args>(__args)...); 00213 } 00214 00215 typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_; 00216 typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_; 00217 00218 template<typename _Tp, typename... _Args> 00219 void 00220 _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args) 00221 { 00222 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00223 _O_traits::construct(__outermost(*this), __p, 00224 allocator_arg, inner_allocator(), 00225 std::forward<_Args>(__args)...); 00226 } 00227 00228 template<typename _Tp, typename... _Args> 00229 void 00230 _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args) 00231 { 00232 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00233 _O_traits::construct(__outermost(*this), __p, 00234 std::forward<_Args>(__args)..., 00235 inner_allocator()); 00236 } 00237 00238 template<typename _Alloc> 00239 static _Alloc 00240 _S_select_on_copy(const _Alloc& __a) 00241 { 00242 typedef allocator_traits<_Alloc> __a_traits; 00243 return __a_traits::select_on_container_copy_construction(__a); 00244 } 00245 00246 template<std::size_t... _Indices> 00247 scoped_allocator_adaptor(tuple<const _OuterAlloc&, 00248 const _InnerAllocs&...> __refs, 00249 _Index_tuple<_Indices...>) 00250 : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))), 00251 _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...) 00252 { } 00253 00254 public: 00255 typedef _OuterAlloc outer_allocator_type; 00256 typedef typename __inner_type::__type inner_allocator_type; 00257 00258 typedef typename __traits::value_type value_type; 00259 typedef typename __traits::size_type size_type; 00260 typedef typename __traits::difference_type difference_type; 00261 typedef typename __traits::pointer pointer; 00262 typedef typename __traits::const_pointer const_pointer; 00263 typedef typename __traits::void_pointer void_pointer; 00264 typedef typename __traits::const_void_pointer const_void_pointer; 00265 00266 typedef typename conditional< 00267 __any_of<__propagate_on_copy, _OuterAlloc, _InnerAllocs...>::value, 00268 true_type, false_type>::type propagate_on_container_copy_assignment; 00269 typedef typename conditional< 00270 __any_of<__propagate_on_move, _OuterAlloc, _InnerAllocs...>::value, 00271 true_type, false_type>::type propagate_on_container_move_assignment; 00272 typedef typename conditional< 00273 __any_of<__propagate_on_swap, _OuterAlloc, _InnerAllocs...>::value, 00274 true_type, false_type>::type propagate_on_container_swap; 00275 00276 template <class _Tp> 00277 struct rebind 00278 { 00279 typedef scoped_allocator_adaptor< 00280 typename __traits::template rebind_alloc<_Tp>, 00281 _InnerAllocs...> other; 00282 }; 00283 00284 scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { } 00285 00286 template<typename _Outer2> 00287 scoped_allocator_adaptor(_Outer2&& __outer, 00288 const _InnerAllocs&... __inner) 00289 : _OuterAlloc(std::forward<_Outer2>(__outer)), 00290 _M_inner(__inner...) 00291 { } 00292 00293 scoped_allocator_adaptor(const scoped_allocator_adaptor& __other) 00294 : _OuterAlloc(__other.outer_allocator()), 00295 _M_inner(__other._M_inner) 00296 { } 00297 00298 scoped_allocator_adaptor(scoped_allocator_adaptor&& __other) 00299 : _OuterAlloc(std::move(__other.outer_allocator())), 00300 _M_inner(std::move(__other._M_inner)) 00301 { } 00302 00303 template<typename _Outer2> 00304 scoped_allocator_adaptor( 00305 const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other) 00306 : _OuterAlloc(__other.outer_allocator()), 00307 _M_inner(__other._M_inner) 00308 { } 00309 00310 template<typename _Outer2> 00311 scoped_allocator_adaptor( 00312 scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other) 00313 : _OuterAlloc(std::move(__other.outer_allocator())), 00314 _M_inner(std::move(__other._M_inner)) 00315 { } 00316 00317 scoped_allocator_adaptor& 00318 operator=(const scoped_allocator_adaptor&) = default; 00319 00320 scoped_allocator_adaptor& 00321 operator=(scoped_allocator_adaptor&&) = default; 00322 00323 inner_allocator_type& inner_allocator() noexcept 00324 { return _M_inner._M_get(this); } 00325 00326 const inner_allocator_type& inner_allocator() const noexcept 00327 { return _M_inner._M_get(this); } 00328 00329 outer_allocator_type& outer_allocator() noexcept 00330 { return static_cast<_OuterAlloc&>(*this); } 00331 00332 const outer_allocator_type& outer_allocator() const noexcept 00333 { return static_cast<const _OuterAlloc&>(*this); } 00334 00335 pointer allocate(size_type __n) 00336 { return __traits::allocate(outer_allocator(), __n); } 00337 00338 pointer allocate(size_type __n, const_void_pointer __hint) 00339 { return __traits::allocate(outer_allocator(), __n, __hint); } 00340 00341 void deallocate(pointer __p, size_type __n) 00342 { return __traits::deallocate(outer_allocator(), __p, __n); } 00343 00344 size_type max_size() const 00345 { return __traits::max_size(outer_allocator()); } 00346 00347 template<typename _Tp, typename... _Args> 00348 void construct(_Tp* __p, _Args&&... __args) 00349 { 00350 auto& __inner = inner_allocator(); 00351 auto __use_tag 00352 = __use_alloc<_Tp, inner_allocator_type, _Args...>(__inner); 00353 _M_construct(__use_tag, __p, std::forward<_Args>(__args)...); 00354 } 00355 00356 template<typename _T1, typename _T2, typename... _Args1, 00357 typename... _Args2> 00358 void 00359 construct(pair<_T1, _T2>* __p, piecewise_construct_t, 00360 tuple<_Args1...> __x, tuple<_Args2...> __y) 00361 { 00362 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00363 // 2203. wrong argument types for piecewise construction 00364 auto& __inner = inner_allocator(); 00365 auto __x_use_tag 00366 = __use_alloc<_T1, inner_allocator_type, _Args1...>(__inner); 00367 auto __y_use_tag 00368 = __use_alloc<_T2, inner_allocator_type, _Args2...>(__inner); 00369 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00370 _O_traits::construct(__outermost(*this), __p, piecewise_construct, 00371 _M_construct_p(__x_use_tag, __x), 00372 _M_construct_p(__y_use_tag, __y)); 00373 } 00374 00375 template<typename _T1, typename _T2> 00376 void 00377 construct(pair<_T1, _T2>* __p) 00378 { construct(__p, piecewise_construct, tuple<>(), tuple<>()); } 00379 00380 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00381 void 00382 construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v) 00383 { 00384 construct(__p, piecewise_construct, 00385 std::forward_as_tuple(std::forward<_Up>(__u)), 00386 std::forward_as_tuple(std::forward<_Vp>(__v))); 00387 } 00388 00389 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00390 void 00391 construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x) 00392 { 00393 construct(__p, piecewise_construct, 00394 std::forward_as_tuple(__x.first), 00395 std::forward_as_tuple(__x.second)); 00396 } 00397 00398 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00399 void 00400 construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x) 00401 { 00402 construct(__p, piecewise_construct, 00403 std::forward_as_tuple(std::forward<_Up>(__x.first)), 00404 std::forward_as_tuple(std::forward<_Vp>(__x.second))); 00405 } 00406 00407 template<typename _Tp> 00408 void destroy(_Tp* __p) 00409 { 00410 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00411 _O_traits::destroy(__outermost(*this), __p); 00412 } 00413 00414 scoped_allocator_adaptor 00415 select_on_container_copy_construction() const 00416 { 00417 typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type 00418 _Indices; 00419 return scoped_allocator_adaptor(_M_tie(), _Indices()); 00420 } 00421 00422 template <typename _OutA1, typename _OutA2, typename... _InA> 00423 friend bool 00424 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00425 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept; 00426 00427 private: 00428 template<typename _Tuple> 00429 _Tuple&& 00430 _M_construct_p(__uses_alloc0, _Tuple& __t) 00431 { return std::move(__t); } 00432 00433 template<typename... _Args> 00434 std::tuple<allocator_arg_t, inner_allocator_type&, _Args...> 00435 _M_construct_p(__uses_alloc1_, std::tuple<_Args...>& __t) 00436 { 00437 typedef std::tuple<allocator_arg_t, inner_allocator_type&> _Tuple; 00438 return std::tuple_cat(_Tuple(allocator_arg, inner_allocator()), 00439 std::move(__t)); 00440 } 00441 00442 template<typename... _Args> 00443 std::tuple<_Args..., inner_allocator_type&> 00444 _M_construct_p(__uses_alloc2_, std::tuple<_Args...>& __t) 00445 { 00446 typedef std::tuple<inner_allocator_type&> _Tuple; 00447 return std::tuple_cat(std::move(__t), _Tuple(inner_allocator())); 00448 } 00449 }; 00450 00451 template <typename _OutA1, typename _OutA2, typename... _InA> 00452 inline bool 00453 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00454 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00455 { 00456 return __a.outer_allocator() == __b.outer_allocator() 00457 && __a._M_inner == __b._M_inner; 00458 } 00459 00460 template <typename _OutA1, typename _OutA2, typename... _InA> 00461 inline bool 00462 operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00463 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00464 { return !(__a == __b); } 00465 00466 /// @} 00467 00468 _GLIBCXX_END_NAMESPACE_VERSION 00469 } // namespace 00470 00471 #endif // C++11 00472 00473 #endif // _SCOPED_ALLOCATOR