231 lines
7.5 KiB
C++
231 lines
7.5 KiB
C++
// Allocator traits -*- C++ -*-
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// Copyright (C) 2011-2012 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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// 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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// 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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// 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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/** @file ext/alloc_traits.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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#ifndef _EXT_ALLOC_TRAITS_H
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#define _EXT_ALLOC_TRAITS_H 1
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#pragma GCC system_header
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#if __cplusplus >= 201103L
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# include <bits/alloc_traits.h>
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#else
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# include <bits/allocator.h> // for __alloc_swap
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#endif
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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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template<typename> struct allocator;
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#if __cplusplus >= 201103L
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template<typename _Alloc>
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struct __allocator_always_compares_equal
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{ static const bool value = false; };
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template<typename _Alloc>
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const bool __allocator_always_compares_equal<_Alloc>::value;
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template<typename _Tp>
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struct __allocator_always_compares_equal<std::allocator<_Tp>>
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{ static const bool value = true; };
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template<typename _Tp>
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const bool __allocator_always_compares_equal<std::allocator<_Tp>>::value;
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template<typename, typename> struct array_allocator;
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template<typename _Tp, typename _Array>
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struct __allocator_always_compares_equal<array_allocator<_Tp, _Array>>
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{ static const bool value = true; };
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template<typename _Tp, typename _Array>
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const bool
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__allocator_always_compares_equal<array_allocator<_Tp, _Array>>::value;
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template<typename> struct mt_allocator;
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template<typename _Tp>
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struct __allocator_always_compares_equal<mt_allocator<_Tp>>
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{ static const bool value = true; };
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template<typename _Tp>
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const bool __allocator_always_compares_equal<mt_allocator<_Tp>>::value;
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template<typename> struct new_allocator;
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template<typename _Tp>
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struct __allocator_always_compares_equal<new_allocator<_Tp>>
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{ static const bool value = true; };
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template<typename _Tp>
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const bool __allocator_always_compares_equal<new_allocator<_Tp>>::value;
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template<typename> struct pool_allocator;
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template<typename _Tp>
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struct __allocator_always_compares_equal<pool_allocator<_Tp>>
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{ static const bool value = true; };
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template<typename _Tp>
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const bool __allocator_always_compares_equal<pool_allocator<_Tp>>::value;
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#endif
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/**
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* @brief Uniform interface to C++98 and C++0x allocators.
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* @ingroup allocators
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*/
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template<typename _Alloc>
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struct __alloc_traits
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#if __cplusplus >= 201103L
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: std::allocator_traits<_Alloc>
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#endif
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{
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typedef _Alloc allocator_type;
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#if __cplusplus >= 201103L
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typedef std::allocator_traits<_Alloc> _Base_type;
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typedef typename _Base_type::value_type value_type;
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typedef typename _Base_type::pointer pointer;
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typedef typename _Base_type::const_pointer const_pointer;
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typedef typename _Base_type::size_type size_type;
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typedef typename _Base_type::difference_type difference_type;
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// C++0x allocators do not define reference or const_reference
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typedef value_type& reference;
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typedef const value_type& const_reference;
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using _Base_type::allocate;
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using _Base_type::deallocate;
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using _Base_type::construct;
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using _Base_type::destroy;
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using _Base_type::max_size;
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private:
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template<typename _Ptr>
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struct __is_custom_pointer
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: std::integral_constant<bool, std::is_same<pointer, _Ptr>::value
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&& !std::is_pointer<_Ptr>::value>
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{ };
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public:
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// overload construct for non-standard pointer types
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template<typename _Ptr, typename... _Args>
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static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
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construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
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{
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_Base_type::construct(__a, std::addressof(*__p),
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std::forward<_Args>(__args)...);
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}
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// overload destroy for non-standard pointer types
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template<typename _Ptr>
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static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
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destroy(_Alloc& __a, _Ptr __p)
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{ _Base_type::destroy(__a, std::addressof(*__p)); }
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static _Alloc _S_select_on_copy(const _Alloc& __a)
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{ return _Base_type::select_on_container_copy_construction(__a); }
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static void _S_on_swap(_Alloc& __a, _Alloc& __b)
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{ std::__alloc_on_swap(__a, __b); }
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static constexpr bool _S_propagate_on_copy_assign()
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{ return _Base_type::propagate_on_container_copy_assignment::value; }
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static constexpr bool _S_propagate_on_move_assign()
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{ return _Base_type::propagate_on_container_move_assignment::value; }
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static constexpr bool _S_propagate_on_swap()
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{ return _Base_type::propagate_on_container_swap::value; }
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static constexpr bool _S_always_equal()
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{ return __allocator_always_compares_equal<_Alloc>::value; }
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static constexpr bool _S_nothrow_move()
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{ return _S_propagate_on_move_assign() || _S_always_equal(); }
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static constexpr bool _S_nothrow_swap()
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{
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using std::swap;
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return !_S_propagate_on_swap()
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|| noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>()));
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}
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template<typename _Tp>
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struct rebind
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{ typedef typename _Base_type::template rebind_alloc<_Tp> other; };
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#else
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typedef typename _Alloc::pointer pointer;
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typedef typename _Alloc::const_pointer const_pointer;
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typedef typename _Alloc::value_type value_type;
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typedef typename _Alloc::reference reference;
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typedef typename _Alloc::const_reference const_reference;
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typedef typename _Alloc::size_type size_type;
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typedef typename _Alloc::difference_type difference_type;
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static pointer
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allocate(_Alloc& __a, size_type __n)
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{ return __a.allocate(__n); }
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static void deallocate(_Alloc& __a, pointer __p, size_type __n)
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{ __a.deallocate(__p, __n); }
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template<typename _Tp>
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static void construct(_Alloc& __a, pointer __p, const _Tp& __arg)
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{ __a.construct(__p, __arg); }
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static void destroy(_Alloc& __a, pointer __p)
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{ __a.destroy(__p); }
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static size_type max_size(const _Alloc& __a)
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{ return __a.max_size(); }
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static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; }
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static void _S_on_swap(_Alloc& __a, _Alloc& __b)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 431. Swapping containers with unequal allocators.
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std::__alloc_swap<_Alloc>::_S_do_it(__a, __b);
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}
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template<typename _Tp>
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struct rebind
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{ typedef typename _Alloc::template rebind<_Tp>::other other; };
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#endif
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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