libstdc++
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00001 // <scoped_allocator> -*- C++ -*- 00002 00003 // Copyright (C) 2011-2016 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 inline auto 00053 __do_outermost(_Alloc& __a, int) -> decltype(__a.outer_allocator()) 00054 { return __a.outer_allocator(); } 00055 00056 template<typename _Alloc> 00057 inline _Alloc& 00058 __do_outermost(_Alloc& __a, ...) 00059 { return __a; } 00060 00061 // TODO: make recursive (see note in 20.12.4/1) 00062 template<typename _Alloc> 00063 inline auto 00064 __outermost(_Alloc& __a) 00065 -> decltype(__do_outermost(__a, 0)) 00066 { return __do_outermost(__a, 0); } 00067 00068 template<typename _OuterAlloc, typename... _InnerAllocs> 00069 class scoped_allocator_adaptor; 00070 00071 template<typename...> 00072 struct __inner_type_impl; 00073 00074 template<typename _Outer> 00075 struct __inner_type_impl<_Outer> 00076 { 00077 typedef scoped_allocator_adaptor<_Outer> __type; 00078 00079 __inner_type_impl() = default; 00080 __inner_type_impl(const __inner_type_impl&) = default; 00081 __inner_type_impl(__inner_type_impl&&) = default; 00082 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00083 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00084 00085 template<typename _Alloc> 00086 __inner_type_impl(const __inner_type_impl<_Alloc>& __other) 00087 { } 00088 00089 template<typename _Alloc> 00090 __inner_type_impl(__inner_type_impl<_Alloc>&& __other) 00091 { } 00092 00093 __type& 00094 _M_get(__type* __p) noexcept { return *__p; } 00095 00096 const __type& 00097 _M_get(const __type* __p) const noexcept { return *__p; } 00098 00099 tuple<> 00100 _M_tie() const noexcept { return tuple<>(); } 00101 00102 bool 00103 operator==(const __inner_type_impl&) const noexcept 00104 { return true; } 00105 }; 00106 00107 template<typename _Outer, typename _InnerHead, typename... _InnerTail> 00108 struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...> 00109 { 00110 typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type; 00111 00112 __inner_type_impl() = default; 00113 __inner_type_impl(const __inner_type_impl&) = default; 00114 __inner_type_impl(__inner_type_impl&&) = default; 00115 __inner_type_impl& operator=(const __inner_type_impl&) = default; 00116 __inner_type_impl& operator=(__inner_type_impl&&) = default; 00117 00118 template<typename... _Allocs> 00119 __inner_type_impl(const __inner_type_impl<_Allocs...>& __other) 00120 : _M_inner(__other._M_inner) { } 00121 00122 template<typename... _Allocs> 00123 __inner_type_impl(__inner_type_impl<_Allocs...>&& __other) 00124 : _M_inner(std::move(__other._M_inner)) { } 00125 00126 template<typename... _Args> 00127 explicit 00128 __inner_type_impl(_Args&&... __args) 00129 : _M_inner(std::forward<_Args>(__args)...) { } 00130 00131 __type& 00132 _M_get(void*) noexcept { return _M_inner; } 00133 00134 const __type& 00135 _M_get(const void*) const noexcept { return _M_inner; } 00136 00137 tuple<const _InnerHead&, const _InnerTail&...> 00138 _M_tie() const noexcept 00139 { return _M_inner._M_tie(); } 00140 00141 bool 00142 operator==(const __inner_type_impl& __other) const noexcept 00143 { return _M_inner == __other._M_inner; } 00144 00145 private: 00146 template<typename...> friend class __inner_type_impl; 00147 template<typename, typename...> friend class scoped_allocator_adaptor; 00148 00149 __type _M_inner; 00150 }; 00151 00152 /// Primary class template. 00153 template<typename _OuterAlloc, typename... _InnerAllocs> 00154 class scoped_allocator_adaptor 00155 : public _OuterAlloc 00156 { 00157 typedef allocator_traits<_OuterAlloc> __traits; 00158 00159 typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type; 00160 __inner_type _M_inner; 00161 00162 template<typename _Outer, typename... _Inner> 00163 friend class scoped_allocator_adaptor; 00164 00165 template<typename...> 00166 friend class __inner_type_impl; 00167 00168 tuple<const _OuterAlloc&, const _InnerAllocs&...> 00169 _M_tie() const noexcept 00170 { return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); } 00171 00172 template<typename _Alloc> 00173 using __outermost_type = typename 00174 std::decay<decltype(__outermost(std::declval<_Alloc&>()))>::type; 00175 00176 template<typename _Alloc> 00177 using __outermost_alloc_traits 00178 = allocator_traits<__outermost_type<_Alloc>>; 00179 00180 template<typename _Tp, typename... _Args> 00181 void 00182 _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args) 00183 { 00184 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00185 _O_traits::construct(__outermost(*this), __p, 00186 std::forward<_Args>(__args)...); 00187 } 00188 00189 typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_; 00190 typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_; 00191 00192 template<typename _Tp, typename... _Args> 00193 void 00194 _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args) 00195 { 00196 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00197 _O_traits::construct(__outermost(*this), __p, 00198 allocator_arg, inner_allocator(), 00199 std::forward<_Args>(__args)...); 00200 } 00201 00202 template<typename _Tp, typename... _Args> 00203 void 00204 _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args) 00205 { 00206 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00207 _O_traits::construct(__outermost(*this), __p, 00208 std::forward<_Args>(__args)..., 00209 inner_allocator()); 00210 } 00211 00212 template<typename _Alloc> 00213 static _Alloc 00214 _S_select_on_copy(const _Alloc& __a) 00215 { 00216 typedef allocator_traits<_Alloc> __a_traits; 00217 return __a_traits::select_on_container_copy_construction(__a); 00218 } 00219 00220 template<std::size_t... _Indices> 00221 scoped_allocator_adaptor(tuple<const _OuterAlloc&, 00222 const _InnerAllocs&...> __refs, 00223 _Index_tuple<_Indices...>) 00224 : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))), 00225 _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...) 00226 { } 00227 00228 public: 00229 typedef _OuterAlloc outer_allocator_type; 00230 typedef typename __inner_type::__type inner_allocator_type; 00231 00232 typedef typename __traits::value_type value_type; 00233 typedef typename __traits::size_type size_type; 00234 typedef typename __traits::difference_type difference_type; 00235 typedef typename __traits::pointer pointer; 00236 typedef typename __traits::const_pointer const_pointer; 00237 typedef typename __traits::void_pointer void_pointer; 00238 typedef typename __traits::const_void_pointer const_void_pointer; 00239 00240 typedef typename __or_< 00241 typename __traits::propagate_on_container_copy_assignment, 00242 typename allocator_traits<_InnerAllocs>:: 00243 propagate_on_container_copy_assignment...>::type 00244 propagate_on_container_copy_assignment; 00245 00246 typedef typename __or_< 00247 typename __traits::propagate_on_container_move_assignment, 00248 typename allocator_traits<_InnerAllocs>:: 00249 propagate_on_container_move_assignment...>::type 00250 propagate_on_container_move_assignment; 00251 00252 typedef typename __or_< 00253 typename __traits::propagate_on_container_swap, 00254 typename allocator_traits<_InnerAllocs>:: 00255 propagate_on_container_swap...>::type 00256 propagate_on_container_swap; 00257 00258 typedef typename __and_< 00259 typename __traits::is_always_equal, 00260 typename allocator_traits<_InnerAllocs>::is_always_equal...>::type 00261 is_always_equal; 00262 00263 template <class _Tp> 00264 struct rebind 00265 { 00266 typedef scoped_allocator_adaptor< 00267 typename __traits::template rebind_alloc<_Tp>, 00268 _InnerAllocs...> other; 00269 }; 00270 00271 scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { } 00272 00273 template<typename _Outer2> 00274 scoped_allocator_adaptor(_Outer2&& __outer, 00275 const _InnerAllocs&... __inner) 00276 : _OuterAlloc(std::forward<_Outer2>(__outer)), 00277 _M_inner(__inner...) 00278 { } 00279 00280 scoped_allocator_adaptor(const scoped_allocator_adaptor& __other) 00281 : _OuterAlloc(__other.outer_allocator()), 00282 _M_inner(__other._M_inner) 00283 { } 00284 00285 scoped_allocator_adaptor(scoped_allocator_adaptor&& __other) 00286 : _OuterAlloc(std::move(__other.outer_allocator())), 00287 _M_inner(std::move(__other._M_inner)) 00288 { } 00289 00290 template<typename _Outer2> 00291 scoped_allocator_adaptor( 00292 const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other) 00293 : _OuterAlloc(__other.outer_allocator()), 00294 _M_inner(__other._M_inner) 00295 { } 00296 00297 template<typename _Outer2> 00298 scoped_allocator_adaptor( 00299 scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other) 00300 : _OuterAlloc(std::move(__other.outer_allocator())), 00301 _M_inner(std::move(__other._M_inner)) 00302 { } 00303 00304 scoped_allocator_adaptor& 00305 operator=(const scoped_allocator_adaptor&) = default; 00306 00307 scoped_allocator_adaptor& 00308 operator=(scoped_allocator_adaptor&&) = default; 00309 00310 inner_allocator_type& inner_allocator() noexcept 00311 { return _M_inner._M_get(this); } 00312 00313 const inner_allocator_type& inner_allocator() const noexcept 00314 { return _M_inner._M_get(this); } 00315 00316 outer_allocator_type& outer_allocator() noexcept 00317 { return static_cast<_OuterAlloc&>(*this); } 00318 00319 const outer_allocator_type& outer_allocator() const noexcept 00320 { return static_cast<const _OuterAlloc&>(*this); } 00321 00322 pointer allocate(size_type __n) 00323 { return __traits::allocate(outer_allocator(), __n); } 00324 00325 pointer allocate(size_type __n, const_void_pointer __hint) 00326 { return __traits::allocate(outer_allocator(), __n, __hint); } 00327 00328 void deallocate(pointer __p, size_type __n) 00329 { return __traits::deallocate(outer_allocator(), __p, __n); } 00330 00331 size_type max_size() const 00332 { return __traits::max_size(outer_allocator()); } 00333 00334 template<typename _Tp, typename... _Args> 00335 void construct(_Tp* __p, _Args&&... __args) 00336 { 00337 auto& __inner = inner_allocator(); 00338 auto __use_tag 00339 = __use_alloc<_Tp, inner_allocator_type, _Args...>(__inner); 00340 _M_construct(__use_tag, __p, std::forward<_Args>(__args)...); 00341 } 00342 00343 template<typename _T1, typename _T2, typename... _Args1, 00344 typename... _Args2> 00345 void 00346 construct(pair<_T1, _T2>* __p, piecewise_construct_t, 00347 tuple<_Args1...> __x, tuple<_Args2...> __y) 00348 { 00349 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00350 // 2203. wrong argument types for piecewise construction 00351 auto& __inner = inner_allocator(); 00352 auto __x_use_tag 00353 = __use_alloc<_T1, inner_allocator_type, _Args1...>(__inner); 00354 auto __y_use_tag 00355 = __use_alloc<_T2, inner_allocator_type, _Args2...>(__inner); 00356 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00357 _O_traits::construct(__outermost(*this), __p, piecewise_construct, 00358 _M_construct_p(__x_use_tag, __x), 00359 _M_construct_p(__y_use_tag, __y)); 00360 } 00361 00362 template<typename _T1, typename _T2> 00363 void 00364 construct(pair<_T1, _T2>* __p) 00365 { construct(__p, piecewise_construct, tuple<>(), tuple<>()); } 00366 00367 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00368 void 00369 construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v) 00370 { 00371 construct(__p, piecewise_construct, 00372 std::forward_as_tuple(std::forward<_Up>(__u)), 00373 std::forward_as_tuple(std::forward<_Vp>(__v))); 00374 } 00375 00376 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00377 void 00378 construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x) 00379 { 00380 construct(__p, piecewise_construct, 00381 std::forward_as_tuple(__x.first), 00382 std::forward_as_tuple(__x.second)); 00383 } 00384 00385 template<typename _T1, typename _T2, typename _Up, typename _Vp> 00386 void 00387 construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x) 00388 { 00389 construct(__p, piecewise_construct, 00390 std::forward_as_tuple(std::forward<_Up>(__x.first)), 00391 std::forward_as_tuple(std::forward<_Vp>(__x.second))); 00392 } 00393 00394 template<typename _Tp> 00395 void destroy(_Tp* __p) 00396 { 00397 typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; 00398 _O_traits::destroy(__outermost(*this), __p); 00399 } 00400 00401 scoped_allocator_adaptor 00402 select_on_container_copy_construction() const 00403 { 00404 typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type 00405 _Indices; 00406 return scoped_allocator_adaptor(_M_tie(), _Indices()); 00407 } 00408 00409 template <typename _OutA1, typename _OutA2, typename... _InA> 00410 friend bool 00411 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00412 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept; 00413 00414 private: 00415 template<typename _Tuple> 00416 _Tuple&& 00417 _M_construct_p(__uses_alloc0, _Tuple& __t) 00418 { return std::move(__t); } 00419 00420 template<typename... _Args> 00421 std::tuple<allocator_arg_t, inner_allocator_type&, _Args...> 00422 _M_construct_p(__uses_alloc1_, std::tuple<_Args...>& __t) 00423 { 00424 typedef std::tuple<allocator_arg_t, inner_allocator_type&> _Tuple; 00425 return std::tuple_cat(_Tuple(allocator_arg, inner_allocator()), 00426 std::move(__t)); 00427 } 00428 00429 template<typename... _Args> 00430 std::tuple<_Args..., inner_allocator_type&> 00431 _M_construct_p(__uses_alloc2_, std::tuple<_Args...>& __t) 00432 { 00433 typedef std::tuple<inner_allocator_type&> _Tuple; 00434 return std::tuple_cat(std::move(__t), _Tuple(inner_allocator())); 00435 } 00436 }; 00437 00438 template <typename _OutA1, typename _OutA2, typename... _InA> 00439 inline bool 00440 operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00441 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00442 { 00443 return __a.outer_allocator() == __b.outer_allocator() 00444 && __a._M_inner == __b._M_inner; 00445 } 00446 00447 template <typename _OutA1, typename _OutA2, typename... _InA> 00448 inline bool 00449 operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, 00450 const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept 00451 { return !(__a == __b); } 00452 00453 /// @} 00454 00455 _GLIBCXX_END_NAMESPACE_VERSION 00456 } // namespace 00457 00458 #endif // C++11 00459 00460 #endif // _SCOPED_ALLOCATOR