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toolchain-gcc-arm-embedded/arm-none-eabi/include/c++/10.2.1/scoped_allocator

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  1. // <scoped_allocator> -*- C++ -*-

  2. 

  3. // Copyright (C) 2011-2020 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.  *  @ingroup allocators

  28.  */

  29. 

  30. #ifndef _SCOPED_ALLOCATOR

  31. #define _SCOPED_ALLOCATOR 1

  32. 

  33. #pragma GCC system_header

  34. 

  35. #if __cplusplus < 201103L

  36. # include <bits/c++0x_warning.h>

  37. #else

  38. 

  39. #include <memory>

  40. #include <utility>

  41. #include <tuple>

  42. #include <bits/alloc_traits.h>

  43. 

  44. namespace std _GLIBCXX_VISIBILITY(default)

  45. {

  46. _GLIBCXX_BEGIN_NAMESPACE_VERSION

  47. 

  48.   /**

  49.    * @addtogroup allocators

  50.    * @{

  51.    */

  52. 

  53.   /// @cond undocumented

  54. 

  55.   template<typename _Alloc>

  56.     using __outer_allocator_t

  57.       = decltype(std::declval<_Alloc>().outer_allocator());

  58. 

  59.   template<typename _Alloc, typename = void>

  60.     struct __outermost_type

  61.     {

  62.       using type = _Alloc;

  63.       static type& _S_outermost(_Alloc& __a) { return __a; }

  64.     };

  65. 

  66.   template<typename _Alloc>

  67.     struct __outermost_type<_Alloc, __void_t<__outer_allocator_t<_Alloc>>>

  68.     : __outermost_type<

  69.       typename remove_reference<__outer_allocator_t<_Alloc>>::type

  70.     >

  71.     {

  72.       using __base = __outermost_type<

  73.         typename remove_reference<__outer_allocator_t<_Alloc>>::type

  74.       >;

  75. 

  76.       static typename __base::type&

  77.       _S_outermost(_Alloc& __a)

  78.       { return __base::_S_outermost(__a.outer_allocator()); }

  79.     };

  80. 

  81.   /// Implementation of the OUTERMOST pseudofunction

  82.   template<typename _Alloc>

  83.     inline typename __outermost_type<_Alloc>::type&

  84.     __outermost(_Alloc& __a)

  85.     { return __outermost_type<_Alloc>::_S_outermost(__a); }

  86. 

  87.   template<typename _OuterAlloc, typename... _InnerAllocs>

  88.     class scoped_allocator_adaptor;

  89. 

  90.   template<typename...>

  91.     struct __inner_type_impl;

  92. 

  93.   template<typename _Outer>

  94.     struct __inner_type_impl<_Outer>

  95.     {

  96.       typedef scoped_allocator_adaptor<_Outer> __type;

  97. 

  98.       __inner_type_impl() = default;

  99.       __inner_type_impl(const __inner_type_impl&) = default;

  100.       __inner_type_impl(__inner_type_impl&&) = default;

  101.       __inner_type_impl& operator=(const __inner_type_impl&) = default;

  102.       __inner_type_impl& operator=(__inner_type_impl&&) = default;

  103. 

  104.       template<typename _Alloc>

  105.       __inner_type_impl(const __inner_type_impl<_Alloc>& __other)

  106.       { }

  107. 

  108.       template<typename _Alloc>

  109.       __inner_type_impl(__inner_type_impl<_Alloc>&& __other)

  110.       { }

  111. 

  112.       __type&

  113.       _M_get(__type* __p) noexcept { return *__p; }

  114. 

  115.       const __type&

  116.       _M_get(const __type* __p) const noexcept { return *__p; }

  117. 

  118.       tuple<>

  119.       _M_tie() const noexcept { return tuple<>(); }

  120. 

  121.       bool

  122.       operator==(const __inner_type_impl&) const noexcept

  123.       { return true; }

  124.     };

  125. 

  126.   template<typename _Outer, typename _InnerHead, typename... _InnerTail>

  127.     struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...>

  128.     {

  129.       typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type;

  130. 

  131.       __inner_type_impl() = default;

  132.       __inner_type_impl(const __inner_type_impl&) = default;

  133.       __inner_type_impl(__inner_type_impl&&) = default;

  134.       __inner_type_impl& operator=(const __inner_type_impl&) = default;

  135.       __inner_type_impl& operator=(__inner_type_impl&&) = default;

  136. 

  137.       template<typename... _Allocs>

  138.       __inner_type_impl(const __inner_type_impl<_Allocs...>& __other)

  139.       : _M_inner(__other._M_inner) { }

  140. 

  141.       template<typename... _Allocs>

  142.       __inner_type_impl(__inner_type_impl<_Allocs...>&& __other)

  143.       : _M_inner(std::move(__other._M_inner)) { }

  144. 

  145.     template<typename... _Args>

  146.       explicit

  147.       __inner_type_impl(_Args&&... __args)

  148.       : _M_inner(std::forward<_Args>(__args)...) { }

  149. 

  150.       __type&

  151.       _M_get(void*) noexcept { return _M_inner; }

  152. 

  153.       const __type&

  154.       _M_get(const void*) const noexcept { return _M_inner; }

  155. 

  156.       tuple<const _InnerHead&, const _InnerTail&...>

  157.       _M_tie() const noexcept

  158.       { return _M_inner._M_tie(); }

  159. 

  160.       bool

  161.       operator==(const __inner_type_impl& __other) const noexcept

  162.       { return _M_inner == __other._M_inner; }

  163. 

  164.     private:

  165.       template<typename...> friend class __inner_type_impl;

  166.       template<typename, typename...> friend class scoped_allocator_adaptor;

  167. 

  168.       __type _M_inner;

  169.     };

  170. 

  171.   /// @endcond

  172. 

  173.   /// An adaptor to recursively pass an allocator to the objects it constructs

  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.       template<typename _Alloc>

  194. 	using __outermost_alloc_traits

  195. 	  = allocator_traits<typename __outermost_type<_Alloc>::type>;

  196. 

  197. #if __cplusplus <= 201703

  198.       template<typename _Tp, typename... _Args>

  199.         void

  200.         _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args)

  201.         {

  202. 	  typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;

  203. 	  _O_traits::construct(__outermost(*this), __p,

  204. 			       std::forward<_Args>(__args)...);

  205.         }

  206. 

  207.       typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_;

  208.       typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_;

  209. 

  210.       template<typename _Tp, typename... _Args>

  211.         void

  212.         _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args)

  213.         {

  214. 	  typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;

  215. 	  _O_traits::construct(__outermost(*this), __p,

  216. 			       allocator_arg, inner_allocator(),

  217. 			       std::forward<_Args>(__args)...);

  218.         }

  219. 

  220.       template<typename _Tp, typename... _Args>

  221.         void

  222.         _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args)

  223.         {

  224. 	  typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;

  225. 	  _O_traits::construct(__outermost(*this), __p,

  226. 			       std::forward<_Args>(__args)...,

  227. 			       inner_allocator());

  228.         }

  229. #endif // C++17

  230. 

  231.       template<typename _Alloc>

  232.         static _Alloc

  233.         _S_select_on_copy(const _Alloc& __a)

  234.         {

  235.           typedef allocator_traits<_Alloc> __a_traits;

  236.           return __a_traits::select_on_container_copy_construction(__a);

  237.         }

  238. 

  239.       template<std::size_t... _Indices>

  240.         scoped_allocator_adaptor(tuple<const _OuterAlloc&,

  241.                                        const _InnerAllocs&...> __refs,

  242.                                  _Index_tuple<_Indices...>)

  243.         : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))),

  244.           _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...)

  245.         { }

  246. 

  247.       // Used to constrain constructors to disallow invalid conversions.

  248.       template<typename _Alloc>

  249.         using _Constructible = typename enable_if<

  250.             is_constructible<_OuterAlloc, _Alloc>::value

  251.           >::type;

  252. 

  253.       // _GLIBCXX_RESOLVE_LIB_DEFECTS

  254.       // 2975. Missing case for pair construction in scoped [...] allocators

  255.       template<typename _Tp>

  256. 	struct __not_pair { using type = void; };

  257. 

  258.       template<typename _Tp, typename _Up>

  259. 	struct __not_pair<pair<_Tp, _Up>> { };

  260. 

  261.     public:

  262.       typedef _OuterAlloc                       outer_allocator_type;

  263.       typedef typename __inner_type::__type     inner_allocator_type;

  264. 

  265.       typedef typename __traits::value_type             value_type;

  266.       typedef typename __traits::size_type              size_type;

  267.       typedef typename __traits::difference_type        difference_type;

  268.       typedef typename __traits::pointer                pointer;

  269.       typedef typename __traits::const_pointer          const_pointer;

  270.       typedef typename __traits::void_pointer           void_pointer;

  271.       typedef typename __traits::const_void_pointer     const_void_pointer;

  272. 

  273.       typedef typename __or_<

  274. 	typename __traits::propagate_on_container_copy_assignment,

  275. 	typename allocator_traits<_InnerAllocs>::

  276. 	  propagate_on_container_copy_assignment...>::type

  277. 	  propagate_on_container_copy_assignment;

  278. 

  279.       typedef typename __or_<

  280. 	typename __traits::propagate_on_container_move_assignment,

  281. 	typename allocator_traits<_InnerAllocs>::

  282. 	  propagate_on_container_move_assignment...>::type

  283. 	  propagate_on_container_move_assignment;

  284. 

  285.       typedef typename __or_<

  286. 	typename __traits::propagate_on_container_swap,

  287. 	typename allocator_traits<_InnerAllocs>::

  288. 	  propagate_on_container_swap...>::type

  289. 	  propagate_on_container_swap;

  290. 

  291.       typedef typename __and_<

  292. 	typename __traits::is_always_equal,

  293. 	typename allocator_traits<_InnerAllocs>::is_always_equal...>::type

  294. 	  is_always_equal;

  295. 

  296.       template <class _Tp>

  297.         struct rebind

  298.         {

  299.           typedef scoped_allocator_adaptor<

  300.             typename __traits::template rebind_alloc<_Tp>,

  301.             _InnerAllocs...> other;

  302.         };

  303. 

  304.       scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { }

  305. 

  306.       template<typename _Outer2, typename = _Constructible<_Outer2>>

  307.         scoped_allocator_adaptor(_Outer2&& __outer,

  308.                                  const _InnerAllocs&... __inner)

  309.         : _OuterAlloc(std::forward<_Outer2>(__outer)),

  310.           _M_inner(__inner...)

  311.         { }

  312. 

  313.       scoped_allocator_adaptor(const scoped_allocator_adaptor& __other)

  314.       : _OuterAlloc(__other.outer_allocator()),

  315. 	_M_inner(__other._M_inner)

  316.       { }

  317. 

  318.       scoped_allocator_adaptor(scoped_allocator_adaptor&& __other)

  319.       : _OuterAlloc(std::move(__other.outer_allocator())),

  320. 	_M_inner(std::move(__other._M_inner))

  321.       { }

  322. 

  323.       template<typename _Outer2, typename = _Constructible<const _Outer2&>>

  324.         scoped_allocator_adaptor(

  325.             const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other)

  326.         : _OuterAlloc(__other.outer_allocator()),

  327.           _M_inner(__other._M_inner)

  328.         { }

  329. 

  330.       template<typename _Outer2, typename = _Constructible<_Outer2>>

  331.         scoped_allocator_adaptor(

  332.             scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other)

  333.         : _OuterAlloc(std::move(__other.outer_allocator())),

  334.           _M_inner(std::move(__other._M_inner))

  335.         { }

  336. 

  337.       scoped_allocator_adaptor&

  338.       operator=(const scoped_allocator_adaptor&) = default;

  339. 

  340.       scoped_allocator_adaptor&

  341.       operator=(scoped_allocator_adaptor&&) = default;

  342. 

  343.       inner_allocator_type& inner_allocator() noexcept

  344.       { return _M_inner._M_get(this); }

  345. 

  346.       const inner_allocator_type& inner_allocator() const noexcept

  347.       { return _M_inner._M_get(this); }

  348. 

  349.       outer_allocator_type& outer_allocator() noexcept

  350.       { return static_cast<_OuterAlloc&>(*this); }

  351. 

  352.       const outer_allocator_type& outer_allocator() const noexcept

  353.       { return static_cast<const _OuterAlloc&>(*this); }

  354. 

  355.       _GLIBCXX_NODISCARD pointer allocate(size_type __n)

  356.       { return __traits::allocate(outer_allocator(), __n); }

  357. 

  358.       _GLIBCXX_NODISCARD pointer allocate(size_type __n, const_void_pointer __hint)

  359.       { return __traits::allocate(outer_allocator(), __n, __hint); }

  360. 

  361.       void deallocate(pointer __p, size_type __n)

  362.       { return __traits::deallocate(outer_allocator(), __p, __n); }

  363. 

  364.       size_type max_size() const

  365.       { return __traits::max_size(outer_allocator()); }

  366. 

  367. #if __cplusplus <= 201703

  368.       template<typename _Tp, typename... _Args>

  369. 	typename __not_pair<_Tp>::type

  370. 	construct(_Tp* __p, _Args&&... __args)

  371. 	{

  372. 	  auto& __inner = inner_allocator();

  373. 	  auto __use_tag

  374. 	    = std::__use_alloc<_Tp, inner_allocator_type, _Args...>(__inner);

  375. 	  _M_construct(__use_tag, __p, std::forward<_Args>(__args)...);

  376. 	}

  377. 

  378.       template<typename _T1, typename _T2, typename... _Args1,

  379. 	       typename... _Args2>

  380. 	void

  381. 	construct(pair<_T1, _T2>* __p, piecewise_construct_t,

  382. 		  tuple<_Args1...> __x, tuple<_Args2...> __y)

  383. 	{

  384. 	  // _GLIBCXX_RESOLVE_LIB_DEFECTS

  385. 	  // 2203.  wrong argument types for piecewise construction

  386. 	  auto& __inner = inner_allocator();

  387. 	  auto __x_use_tag

  388. 	    = std::__use_alloc<_T1, inner_allocator_type, _Args1...>(__inner);

  389. 	  auto __y_use_tag

  390. 	    = std::__use_alloc<_T2, inner_allocator_type, _Args2...>(__inner);

  391. 	  typename _Build_index_tuple<sizeof...(_Args1)>::__type __x_indices;

  392. 	  typename _Build_index_tuple<sizeof...(_Args2)>::__type __y_indices;

  393. 	  typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;

  394. 	  _O_traits::construct(__outermost(*this), __p, piecewise_construct,

  395. 			       _M_construct_p(__x_use_tag, __x_indices, __x),

  396. 			       _M_construct_p(__y_use_tag, __y_indices, __y));

  397. 	}

  398. 

  399.       template<typename _T1, typename _T2>

  400. 	void

  401. 	construct(pair<_T1, _T2>* __p)

  402. 	{ construct(__p, piecewise_construct, tuple<>(), tuple<>()); }

  403. 

  404.       template<typename _T1, typename _T2, typename _Up, typename _Vp>

  405. 	void

  406. 	construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v)

  407. 	{

  408. 	  construct(__p, piecewise_construct,

  409. 		    std::forward_as_tuple(std::forward<_Up>(__u)),

  410. 		    std::forward_as_tuple(std::forward<_Vp>(__v)));

  411. 	}

  412. 

  413.       template<typename _T1, typename _T2, typename _Up, typename _Vp>

  414. 	void

  415. 	construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x)

  416. 	{

  417. 	  construct(__p, piecewise_construct,

  418. 		    std::forward_as_tuple(__x.first),

  419. 		    std::forward_as_tuple(__x.second));

  420. 	}

  421. 

  422.       template<typename _T1, typename _T2, typename _Up, typename _Vp>

  423. 	void

  424. 	construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x)

  425. 	{

  426. 	  construct(__p, piecewise_construct,

  427. 		    std::forward_as_tuple(std::forward<_Up>(__x.first)),

  428. 		    std::forward_as_tuple(std::forward<_Vp>(__x.second)));

  429. 	}

  430. #else // C++2a

  431.       template<typename _Tp, typename... _Args>

  432. 	__attribute__((__nonnull__))

  433. 	void

  434. 	construct(_Tp* __p, _Args&&... __args)

  435. 	{

  436. 	  typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;

  437. 	  std::apply([__p, this](auto&&... __newargs) {

  438. 	      _O_traits::construct(__outermost(*this), __p,

  439. 		  std::forward<decltype(__newargs)>(__newargs)...);

  440. 	  },

  441. 	  uses_allocator_construction_args<_Tp>(inner_allocator(),

  442. 	    std::forward<_Args>(__args)...));

  443. 	}

  444. #endif // C++2a

  445. 

  446.       template<typename _Tp>

  447.         void destroy(_Tp* __p)

  448.         {

  449. 	  typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;

  450. 	  _O_traits::destroy(__outermost(*this), __p);

  451. 	}

  452. 

  453.       scoped_allocator_adaptor

  454.       select_on_container_copy_construction() const

  455.       {

  456.         typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type

  457. 	    _Indices;

  458.         return scoped_allocator_adaptor(_M_tie(), _Indices());

  459.       }

  460. 

  461.       template <typename _OutA1, typename _OutA2, typename... _InA>

  462.       friend bool

  463.       operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,

  464.                  const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept;

  465. 

  466.     private:

  467. #if __cplusplus <= 201703L

  468.       template<typename _Ind, typename... _Args>

  469. 	tuple<_Args&&...>

  470. 	_M_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t)

  471. 	{ return std::move(__t); }

  472. 

  473.       template<size_t... _Ind, typename... _Args>

  474. 	tuple<allocator_arg_t, inner_allocator_type&, _Args&&...>

  475. 	_M_construct_p(__uses_alloc1_, _Index_tuple<_Ind...>,

  476. 		       tuple<_Args...>& __t)

  477. 	{

  478. 	  return { allocator_arg, inner_allocator(),

  479. 	      std::get<_Ind>(std::move(__t))...

  480. 	  };

  481. 	}

  482. 

  483.       template<size_t... _Ind, typename... _Args>

  484. 	tuple<_Args&&..., inner_allocator_type&>

  485. 	_M_construct_p(__uses_alloc2_, _Index_tuple<_Ind...>,

  486. 		       tuple<_Args...>& __t)

  487. 	{

  488. 	  return { std::get<_Ind>(std::move(__t))..., inner_allocator() };

  489. 	}

  490. #endif // C++17

  491.     };

  492. 

  493.   /// @related std::scoped_allocator_adaptor

  494.   template <typename _OutA1, typename _OutA2, typename... _InA>

  495.     inline bool

  496.     operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,

  497.                const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept

  498.     {

  499.       return __a.outer_allocator() == __b.outer_allocator()

  500.           && __a._M_inner == __b._M_inner;

  501.     }

  502. 

  503. #if __cpp_impl_three_way_comparison < 201907L

  504.   /// @related std::scoped_allocator_adaptor

  505.   template <typename _OutA1, typename _OutA2, typename... _InA>

  506.     inline bool

  507.     operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,

  508.                const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept

  509.     { return !(__a == __b); }

  510. #endif

  511. 

  512.   /// @}

  513. 

  514. _GLIBCXX_END_NAMESPACE_VERSION

  515. } // namespace

  516. 

  517. #endif // C++11

  518. 

  519. #endif // _SCOPED_ALLOCATOR