| // Allocator traits -*- C++ -*- |
| |
| // Copyright (C) 2011-2020 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /** @file ext/alloc_traits.h |
| * This file is a GNU extension to the Standard C++ Library. |
| */ |
| |
| #ifndef _EXT_ALLOC_TRAITS_H |
| #define _EXT_ALLOC_TRAITS_H 1 |
| |
| #pragma GCC system_header |
| |
| # include <bits/alloc_traits.h> |
| #if __cplusplus < 201103L |
| # include <bits/allocator.h> // for __alloc_swap |
| #endif |
| |
| namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| /** |
| * @brief Uniform interface to C++98 and C++11 allocators. |
| * @ingroup allocators |
| */ |
| template<typename _Alloc, typename = typename _Alloc::value_type> |
| struct __alloc_traits |
| #if __cplusplus >= 201103L |
| : std::allocator_traits<_Alloc> |
| #endif |
| { |
| typedef _Alloc allocator_type; |
| #if __cplusplus >= 201103L |
| typedef std::allocator_traits<_Alloc> _Base_type; |
| typedef typename _Base_type::value_type value_type; |
| typedef typename _Base_type::pointer pointer; |
| typedef typename _Base_type::const_pointer const_pointer; |
| typedef typename _Base_type::size_type size_type; |
| typedef typename _Base_type::difference_type difference_type; |
| // C++11 allocators do not define reference or const_reference |
| typedef value_type& reference; |
| typedef const value_type& const_reference; |
| using _Base_type::allocate; |
| using _Base_type::deallocate; |
| using _Base_type::construct; |
| using _Base_type::destroy; |
| using _Base_type::max_size; |
| |
| private: |
| template<typename _Ptr> |
| using __is_custom_pointer |
| = std::__and_<std::is_same<pointer, _Ptr>, |
| std::__not_<std::is_pointer<_Ptr>>>; |
| |
| public: |
| // overload construct for non-standard pointer types |
| template<typename _Ptr, typename... _Args> |
| static _GLIBCXX14_CONSTEXPR |
| std::__enable_if_t<__is_custom_pointer<_Ptr>::value> |
| construct(_Alloc& __a, _Ptr __p, _Args&&... __args) |
| noexcept(noexcept(_Base_type::construct(__a, std::__to_address(__p), |
| std::forward<_Args>(__args)...))) |
| { |
| _Base_type::construct(__a, std::__to_address(__p), |
| std::forward<_Args>(__args)...); |
| } |
| |
| // overload destroy for non-standard pointer types |
| template<typename _Ptr> |
| static _GLIBCXX14_CONSTEXPR |
| std::__enable_if_t<__is_custom_pointer<_Ptr>::value> |
| destroy(_Alloc& __a, _Ptr __p) |
| noexcept(noexcept(_Base_type::destroy(__a, std::__to_address(__p)))) |
| { _Base_type::destroy(__a, std::__to_address(__p)); } |
| |
| static constexpr _Alloc _S_select_on_copy(const _Alloc& __a) |
| { return _Base_type::select_on_container_copy_construction(__a); } |
| |
| static _GLIBCXX14_CONSTEXPR void _S_on_swap(_Alloc& __a, _Alloc& __b) |
| { std::__alloc_on_swap(__a, __b); } |
| |
| static constexpr bool _S_propagate_on_copy_assign() |
| { return _Base_type::propagate_on_container_copy_assignment::value; } |
| |
| static constexpr bool _S_propagate_on_move_assign() |
| { return _Base_type::propagate_on_container_move_assignment::value; } |
| |
| static constexpr bool _S_propagate_on_swap() |
| { return _Base_type::propagate_on_container_swap::value; } |
| |
| static constexpr bool _S_always_equal() |
| { return _Base_type::is_always_equal::value; } |
| |
| static constexpr bool _S_nothrow_move() |
| { return _S_propagate_on_move_assign() || _S_always_equal(); } |
| |
| template<typename _Tp> |
| struct rebind |
| { typedef typename _Base_type::template rebind_alloc<_Tp> other; }; |
| #else // ! C++11 |
| |
| typedef typename _Alloc::pointer pointer; |
| typedef typename _Alloc::const_pointer const_pointer; |
| typedef typename _Alloc::value_type value_type; |
| typedef typename _Alloc::reference reference; |
| typedef typename _Alloc::const_reference const_reference; |
| typedef typename _Alloc::size_type size_type; |
| typedef typename _Alloc::difference_type difference_type; |
| |
| _GLIBCXX_NODISCARD static pointer |
| allocate(_Alloc& __a, size_type __n) |
| { return __a.allocate(__n); } |
| |
| template<typename _Hint> |
| _GLIBCXX_NODISCARD static pointer |
| allocate(_Alloc& __a, size_type __n, _Hint __hint) |
| { return __a.allocate(__n, __hint); } |
| |
| static void deallocate(_Alloc& __a, pointer __p, size_type __n) |
| { __a.deallocate(__p, __n); } |
| |
| template<typename _Tp> |
| static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) |
| { __a.construct(__p, __arg); } |
| |
| static void destroy(_Alloc& __a, pointer __p) |
| { __a.destroy(__p); } |
| |
| static size_type max_size(const _Alloc& __a) |
| { return __a.max_size(); } |
| |
| static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } |
| |
| static void _S_on_swap(_Alloc& __a, _Alloc& __b) |
| { |
| // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| // 431. Swapping containers with unequal allocators. |
| std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); |
| } |
| |
| template<typename _Tp> |
| struct rebind |
| { typedef typename _Alloc::template rebind<_Tp>::other other; }; |
| #endif // C++11 |
| }; |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace __gnu_cxx |
| |
| #endif |