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// <scoped_allocator> -*- C++ -*- |
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|
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// Copyright (C) 2011-2021 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the |
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// terms of the GNU General Public License as published by the |
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// Free Software Foundation; either version 3, or (at your option) |
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// any later version. |
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|
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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|
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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|
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// <http://www.gnu.org/licenses/>. |
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|
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/** @file include/scoped_allocator |
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* This is a Standard C++ Library header. |
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* @ingroup allocators |
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*/ |
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|
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#ifndef _SCOPED_ALLOCATOR |
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#define _SCOPED_ALLOCATOR 1 |
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|
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#pragma GCC system_header |
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|
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#if __cplusplus < 201103L |
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# include <bits/c++0x_warning.h> |
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#else |
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|
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#include <tuple> |
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#include <bits/alloc_traits.h> |
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#include <bits/stl_pair.h> |
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#include <bits/uses_allocator.h> |
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#if __cplusplus > 201703L |
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# include <bits/uses_allocator_args.h> |
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#endif |
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|
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namespace std _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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/** |
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* @addtogroup allocators |
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* @{ |
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*/ |
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|
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/// @cond undocumented |
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|
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template<typename _Alloc> |
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using __outer_allocator_t |
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= decltype(std::declval<_Alloc>().outer_allocator()); |
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|
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template<typename _Alloc, typename = void> |
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struct __outermost_type |
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{ |
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using type = _Alloc; |
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static type& _S_outermost(_Alloc& __a) { return __a; } |
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}; |
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|
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template<typename _Alloc> |
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struct __outermost_type<_Alloc, __void_t<__outer_allocator_t<_Alloc>>> |
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: __outermost_type< |
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typename remove_reference<__outer_allocator_t<_Alloc>>::type |
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> |
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{ |
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using __base = __outermost_type< |
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typename remove_reference<__outer_allocator_t<_Alloc>>::type |
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>; |
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|
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static typename __base::type& |
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_S_outermost(_Alloc& __a) |
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{ return __base::_S_outermost(__a.outer_allocator()); } |
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}; |
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|
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/// Implementation of the OUTERMOST pseudofunction |
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template<typename _Alloc> |
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inline typename __outermost_type<_Alloc>::type& |
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__outermost(_Alloc& __a) |
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{ return __outermost_type<_Alloc>::_S_outermost(__a); } |
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|
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template<typename _OuterAlloc, typename... _InnerAllocs> |
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class scoped_allocator_adaptor; |
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|
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template<typename...> |
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struct __inner_type_impl; |
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|
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template<typename _Outer> |
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struct __inner_type_impl<_Outer> |
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{ |
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typedef scoped_allocator_adaptor<_Outer> __type; |
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|
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__inner_type_impl() = default; |
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__inner_type_impl(const __inner_type_impl&) = default; |
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__inner_type_impl(__inner_type_impl&&) = default; |
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__inner_type_impl& operator=(const __inner_type_impl&) = default; |
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__inner_type_impl& operator=(__inner_type_impl&&) = default; |
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|
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template<typename _Alloc> |
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__inner_type_impl(const __inner_type_impl<_Alloc>& __other) |
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{ } |
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|
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template<typename _Alloc> |
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__inner_type_impl(__inner_type_impl<_Alloc>&& __other) |
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{ } |
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|
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__type& |
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_M_get(__type* __p) noexcept { return *__p; } |
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|
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const __type& |
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_M_get(const __type* __p) const noexcept { return *__p; } |
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|
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tuple<> |
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_M_tie() const noexcept { return tuple<>(); } |
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|
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bool |
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operator==(const __inner_type_impl&) const noexcept |
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{ return true; } |
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}; |
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|
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template<typename _Outer, typename _InnerHead, typename... _InnerTail> |
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struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...> |
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{ |
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typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type; |
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|
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__inner_type_impl() = default; |
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__inner_type_impl(const __inner_type_impl&) = default; |
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__inner_type_impl(__inner_type_impl&&) = default; |
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__inner_type_impl& operator=(const __inner_type_impl&) = default; |
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__inner_type_impl& operator=(__inner_type_impl&&) = default; |
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|
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template<typename... _Allocs> |
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__inner_type_impl(const __inner_type_impl<_Allocs...>& __other) |
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: _M_inner(__other._M_inner) { } |
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|
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template<typename... _Allocs> |
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__inner_type_impl(__inner_type_impl<_Allocs...>&& __other) |
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: _M_inner(std::move(__other._M_inner)) { } |
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|
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template<typename... _Args> |
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explicit |
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__inner_type_impl(_Args&&... __args) |
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: _M_inner(std::forward<_Args>(__args)...) { } |
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|
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__type& |
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_M_get(void*) noexcept { return _M_inner; } |
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|
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const __type& |
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_M_get(const void*) const noexcept { return _M_inner; } |
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|
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tuple<const _InnerHead&, const _InnerTail&...> |
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_M_tie() const noexcept |
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{ return _M_inner._M_tie(); } |
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|
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bool |
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operator==(const __inner_type_impl& __other) const noexcept |
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{ return _M_inner == __other._M_inner; } |
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|
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private: |
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template<typename...> friend class __inner_type_impl; |
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template<typename, typename...> friend class scoped_allocator_adaptor; |
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|
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__type _M_inner; |
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}; |
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|
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/// @endcond |
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|
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/// An adaptor to recursively pass an allocator to the objects it constructs |
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template<typename _OuterAlloc, typename... _InnerAllocs> |
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class scoped_allocator_adaptor |
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: public _OuterAlloc |
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{ |
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typedef allocator_traits<_OuterAlloc> __traits; |
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|
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typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type; |
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__inner_type _M_inner; |
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|
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template<typename _Outer, typename... _Inner> |
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friend class scoped_allocator_adaptor; |
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|
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template<typename...> |
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friend class __inner_type_impl; |
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|
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tuple<const _OuterAlloc&, const _InnerAllocs&...> |
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_M_tie() const noexcept |
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{ return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); } |
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|
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template<typename _Alloc> |
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using __outermost_alloc_traits |
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= allocator_traits<typename __outermost_type<_Alloc>::type>; |
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|
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#if ! __cpp_lib_make_obj_using_allocator |
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template<typename _Tp, typename... _Args> |
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void |
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_M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args) |
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{ |
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typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; |
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_O_traits::construct(__outermost(*this), __p, |
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std::forward<_Args>(__args)...); |
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} |
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|
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typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_; |
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typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_; |
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|
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template<typename _Tp, typename... _Args> |
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void |
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_M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args) |
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{ |
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typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; |
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_O_traits::construct(__outermost(*this), __p, |
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allocator_arg, inner_allocator(), |
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std::forward<_Args>(__args)...); |
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} |
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|
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template<typename _Tp, typename... _Args> |
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void |
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_M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args) |
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{ |
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typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; |
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_O_traits::construct(__outermost(*this), __p, |
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std::forward<_Args>(__args)..., |
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inner_allocator()); |
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} |
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#endif // ! make_obj_using_allocator |
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|
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template<typename _Alloc> |
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static _Alloc |
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_S_select_on_copy(const _Alloc& __a) |
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{ |
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typedef allocator_traits<_Alloc> __a_traits; |
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return __a_traits::select_on_container_copy_construction(__a); |
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} |
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|
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template<std::size_t... _Indices> |
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scoped_allocator_adaptor(tuple<const _OuterAlloc&, |
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const _InnerAllocs&...> __refs, |
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_Index_tuple<_Indices...>) |
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: _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))), |
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_M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...) |
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{ } |
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|
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// Used to constrain constructors to disallow invalid conversions. |
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template<typename _Alloc> |
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using _Constructible = typename enable_if< |
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is_constructible<_OuterAlloc, _Alloc>::value |
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>::type; |
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|
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 2975. Missing case for pair construction in scoped [...] allocators |
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template<typename _Tp> |
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struct __not_pair { using type = void; }; |
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|
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template<typename _Tp, typename _Up> |
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struct __not_pair<pair<_Tp, _Up>> { }; |
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|
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public: |
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typedef _OuterAlloc outer_allocator_type; |
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typedef typename __inner_type::__type inner_allocator_type; |
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|
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typedef typename __traits::value_type value_type; |
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typedef typename __traits::size_type size_type; |
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typedef typename __traits::difference_type difference_type; |
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typedef typename __traits::pointer pointer; |
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typedef typename __traits::const_pointer const_pointer; |
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typedef typename __traits::void_pointer void_pointer; |
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typedef typename __traits::const_void_pointer const_void_pointer; |
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|
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typedef typename __or_< |
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typename __traits::propagate_on_container_copy_assignment, |
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typename allocator_traits<_InnerAllocs>:: |
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propagate_on_container_copy_assignment...>::type |
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propagate_on_container_copy_assignment; |
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|
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typedef typename __or_< |
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typename __traits::propagate_on_container_move_assignment, |
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typename allocator_traits<_InnerAllocs>:: |
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propagate_on_container_move_assignment...>::type |
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propagate_on_container_move_assignment; |
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|
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typedef typename __or_< |
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typename __traits::propagate_on_container_swap, |
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typename allocator_traits<_InnerAllocs>:: |
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propagate_on_container_swap...>::type |
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propagate_on_container_swap; |
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|
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typedef typename __and_< |
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typename __traits::is_always_equal, |
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typename allocator_traits<_InnerAllocs>::is_always_equal...>::type |
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is_always_equal; |
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|
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template <class _Tp> |
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struct rebind |
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{ |
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typedef scoped_allocator_adaptor< |
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typename __traits::template rebind_alloc<_Tp>, |
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_InnerAllocs...> other; |
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}; |
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|
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scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { } |
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|
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template<typename _Outer2, typename = _Constructible<_Outer2>> |
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scoped_allocator_adaptor(_Outer2&& __outer, |
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const _InnerAllocs&... __inner) |
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: _OuterAlloc(std::forward<_Outer2>(__outer)), |
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_M_inner(__inner...) |
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{ } |
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|
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scoped_allocator_adaptor(const scoped_allocator_adaptor& __other) |
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: _OuterAlloc(__other.outer_allocator()), |
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_M_inner(__other._M_inner) |
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{ } |
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|
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scoped_allocator_adaptor(scoped_allocator_adaptor&& __other) |
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: _OuterAlloc(std::move(__other.outer_allocator())), |
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_M_inner(std::move(__other._M_inner)) |
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{ } |
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|
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template<typename _Outer2, typename = _Constructible<const _Outer2&>> |
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scoped_allocator_adaptor( |
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const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other) |
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: _OuterAlloc(__other.outer_allocator()), |
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_M_inner(__other._M_inner) |
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{ } |
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|
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template<typename _Outer2, typename = _Constructible<_Outer2>> |
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scoped_allocator_adaptor( |
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scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other) |
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: _OuterAlloc(std::move(__other.outer_allocator())), |
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_M_inner(std::move(__other._M_inner)) |
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{ } |
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|
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scoped_allocator_adaptor& |
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operator=(const scoped_allocator_adaptor&) = default; |
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|
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scoped_allocator_adaptor& |
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operator=(scoped_allocator_adaptor&&) = default; |
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|
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inner_allocator_type& inner_allocator() noexcept |
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{ return _M_inner._M_get(this); } |
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|
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const inner_allocator_type& inner_allocator() const noexcept |
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{ return _M_inner._M_get(this); } |
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|
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outer_allocator_type& outer_allocator() noexcept |
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{ return static_cast<_OuterAlloc&>(*this); } |
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|
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const outer_allocator_type& outer_allocator() const noexcept |
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{ return static_cast<const _OuterAlloc&>(*this); } |
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|
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_GLIBCXX_NODISCARD pointer allocate(size_type __n) |
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{ return __traits::allocate(outer_allocator(), __n); } |
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|
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_GLIBCXX_NODISCARD pointer allocate(size_type __n, const_void_pointer __hint) |
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{ return __traits::allocate(outer_allocator(), __n, __hint); } |
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|
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void deallocate(pointer __p, size_type __n) |
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{ return __traits::deallocate(outer_allocator(), __p, __n); } |
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|
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size_type max_size() const |
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{ return __traits::max_size(outer_allocator()); } |
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|
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#if ! __cpp_lib_make_obj_using_allocator |
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template<typename _Tp, typename... _Args> |
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typename __not_pair<_Tp>::type |
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construct(_Tp* __p, _Args&&... __args) |
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{ |
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auto& __inner = inner_allocator(); |
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auto __use_tag |
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= std::__use_alloc<_Tp, inner_allocator_type, _Args...>(__inner); |
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_M_construct(__use_tag, __p, std::forward<_Args>(__args)...); |
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} |
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|
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template<typename _T1, typename _T2, typename... _Args1, |
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typename... _Args2> |
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void |
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construct(pair<_T1, _T2>* __p, piecewise_construct_t, |
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tuple<_Args1...> __x, tuple<_Args2...> __y) |
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{ |
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 2203. wrong argument types for piecewise construction |
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auto& __inner = inner_allocator(); |
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auto __x_use_tag |
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= std::__use_alloc<_T1, inner_allocator_type, _Args1...>(__inner); |
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auto __y_use_tag |
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= std::__use_alloc<_T2, inner_allocator_type, _Args2...>(__inner); |
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typename _Build_index_tuple<sizeof...(_Args1)>::__type __x_indices; |
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typename _Build_index_tuple<sizeof...(_Args2)>::__type __y_indices; |
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typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; |
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_O_traits::construct(__outermost(*this), __p, piecewise_construct, |
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_M_construct_p(__x_use_tag, __x_indices, __x), |
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_M_construct_p(__y_use_tag, __y_indices, __y)); |
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} |
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|
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template<typename _T1, typename _T2> |
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void |
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construct(pair<_T1, _T2>* __p) |
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{ construct(__p, piecewise_construct, tuple<>(), tuple<>()); } |
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|
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template<typename _T1, typename _T2, typename _Up, typename _Vp> |
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void |
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construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v) |
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{ |
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construct(__p, piecewise_construct, |
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std::forward_as_tuple(std::forward<_Up>(__u)), |
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std::forward_as_tuple(std::forward<_Vp>(__v))); |
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} |
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|
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template<typename _T1, typename _T2, typename _Up, typename _Vp> |
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void |
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construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x) |
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{ |
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construct(__p, piecewise_construct, |
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std::forward_as_tuple(__x.first), |
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std::forward_as_tuple(__x.second)); |
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} |
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|
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template<typename _T1, typename _T2, typename _Up, typename _Vp> |
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void |
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construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x) |
| 428 |
{ |
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construct(__p, piecewise_construct, |
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std::forward_as_tuple(std::forward<_Up>(__x.first)), |
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std::forward_as_tuple(std::forward<_Vp>(__x.second))); |
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} |
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#else // make_obj_using_allocator |
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template<typename _Tp, typename... _Args> |
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__attribute__((__nonnull__)) |
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void |
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construct(_Tp* __p, _Args&&... __args) |
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{ |
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typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; |
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std::apply([__p, this](auto&&... __newargs) { |
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_O_traits::construct(__outermost(*this), __p, |
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std::forward<decltype(__newargs)>(__newargs)...); |
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}, |
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uses_allocator_construction_args<_Tp>(inner_allocator(), |
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std::forward<_Args>(__args)...)); |
| 446 |
} |
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#endif |
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|
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template<typename _Tp> |
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void destroy(_Tp* __p) |
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{ |
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typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits; |
| 453 |
_O_traits::destroy(__outermost(*this), __p); |
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} |
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|
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scoped_allocator_adaptor |
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select_on_container_copy_construction() const |
| 458 |
{ |
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typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type |
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_Indices; |
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return scoped_allocator_adaptor(_M_tie(), _Indices()); |
| 462 |
} |
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|
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template <typename _OutA1, typename _OutA2, typename... _InA> |
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friend bool |
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operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, |
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const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept; |
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|
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private: |
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#if ! __cpp_lib_make_obj_using_allocator |
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template<typename _Ind, typename... _Args> |
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tuple<_Args&&...> |
| 473 |
_M_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t) |
| 474 |
{ return std::move(__t); } |
| 475 |
|
| 476 |
template<size_t... _Ind, typename... _Args> |
| 477 |
tuple<allocator_arg_t, inner_allocator_type&, _Args&&...> |
| 478 |
_M_construct_p(__uses_alloc1_, _Index_tuple<_Ind...>, |
| 479 |
tuple<_Args...>& __t) |
| 480 |
{ |
| 481 |
return { allocator_arg, inner_allocator(), |
| 482 |
std::get<_Ind>(std::move(__t))... |
| 483 |
}; |
| 484 |
} |
| 485 |
|
| 486 |
template<size_t... _Ind, typename... _Args> |
| 487 |
tuple<_Args&&..., inner_allocator_type&> |
| 488 |
_M_construct_p(__uses_alloc2_, _Index_tuple<_Ind...>, |
| 489 |
tuple<_Args...>& __t) |
| 490 |
{ |
| 491 |
return { std::get<_Ind>(std::move(__t))..., inner_allocator() }; |
| 492 |
} |
| 493 |
#endif // ! make_obj_using_allocator |
| 494 |
}; |
| 495 |
|
| 496 |
/// @related std::scoped_allocator_adaptor |
| 497 |
template <typename _OutA1, typename _OutA2, typename... _InA> |
| 498 |
inline bool |
| 499 |
operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, |
| 500 |
const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept |
| 501 |
{ |
| 502 |
return __a.outer_allocator() == __b.outer_allocator() |
| 503 |
&& __a._M_inner == __b._M_inner; |
| 504 |
} |
| 505 |
|
| 506 |
#if __cpp_impl_three_way_comparison < 201907L |
| 507 |
/// @related std::scoped_allocator_adaptor |
| 508 |
template <typename _OutA1, typename _OutA2, typename... _InA> |
| 509 |
inline bool |
| 510 |
operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a, |
| 511 |
const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept |
| 512 |
{ return !(__a == __b); } |
| 513 |
#endif |
| 514 |
|
| 515 |
/// @} |
| 516 |
|
| 517 |
_GLIBCXX_END_NAMESPACE_VERSION |
| 518 |
} // namespace |
| 519 |
|
| 520 |
#endif // C++11 |
| 521 |
|
| 522 |
#endif // _SCOPED_ALLOCATOR |
