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537 lines
16 KiB
C++
537 lines
16 KiB
C++
// Allocator traits -*- C++ -*-
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// Copyright (C) 2011-2015 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 bits/alloc_traits.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{memory}
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*/
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#ifndef _ALLOC_TRAITS_H
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#define _ALLOC_TRAITS_H 1
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#if __cplusplus >= 201103L
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#include <bits/memoryfwd.h>
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#include <bits/ptr_traits.h>
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#include <ext/numeric_traits.h>
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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 _Alloc, typename _Tp>
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class __alloctr_rebind_helper
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{
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template<typename _Alloc2, typename _Tp2>
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static constexpr true_type
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_S_chk(typename _Alloc2::template rebind<_Tp2>::other*);
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template<typename, typename>
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static constexpr false_type
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_S_chk(...);
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public:
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using __type = decltype(_S_chk<_Alloc, _Tp>(nullptr));
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};
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template<typename _Alloc, typename _Tp,
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bool = __alloctr_rebind_helper<_Alloc, _Tp>::__type::value>
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struct __alloctr_rebind;
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template<typename _Alloc, typename _Tp>
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struct __alloctr_rebind<_Alloc, _Tp, true>
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{
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typedef typename _Alloc::template rebind<_Tp>::other __type;
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};
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template<template<typename, typename...> class _Alloc, typename _Tp,
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typename _Up, typename... _Args>
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struct __alloctr_rebind<_Alloc<_Up, _Args...>, _Tp, false>
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{
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typedef _Alloc<_Tp, _Args...> __type;
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};
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template<typename _Alloc, typename _Tp>
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using __alloc_rebind = typename __alloctr_rebind<_Alloc, _Tp>::__type;
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/**
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* @brief Uniform interface to all allocator types.
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* @ingroup allocators
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*/
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template<typename _Alloc>
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struct allocator_traits
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{
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/// The allocator type
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typedef _Alloc allocator_type;
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/// The allocated type
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typedef typename _Alloc::value_type value_type;
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#define _GLIBCXX_ALLOC_TR_NESTED_TYPE(_NTYPE, _ALT) \
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private: \
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template<typename _Tp> \
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static typename _Tp::_NTYPE _S_##_NTYPE##_helper(_Tp*); \
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static _ALT _S_##_NTYPE##_helper(...); \
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typedef decltype(_S_##_NTYPE##_helper((_Alloc*)0)) __##_NTYPE; \
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public:
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(pointer, value_type*)
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/**
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* @brief The allocator's pointer type.
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*
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* @c Alloc::pointer if that type exists, otherwise @c value_type*
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*/
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typedef __pointer pointer;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(const_pointer,
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typename pointer_traits<pointer>::template rebind<const value_type>)
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/**
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* @brief The allocator's const pointer type.
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*
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* @c Alloc::const_pointer if that type exists, otherwise
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* <tt> pointer_traits<pointer>::rebind<const value_type> </tt>
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*/
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typedef __const_pointer const_pointer;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(void_pointer,
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typename pointer_traits<pointer>::template rebind<void>)
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/**
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* @brief The allocator's void pointer type.
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*
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* @c Alloc::void_pointer if that type exists, otherwise
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* <tt> pointer_traits<pointer>::rebind<void> </tt>
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*/
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typedef __void_pointer void_pointer;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(const_void_pointer,
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typename pointer_traits<pointer>::template rebind<const void>)
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/**
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* @brief The allocator's const void pointer type.
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*
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* @c Alloc::const_void_pointer if that type exists, otherwise
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* <tt> pointer_traits<pointer>::rebind<const void> </tt>
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*/
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typedef __const_void_pointer const_void_pointer;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(difference_type,
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typename pointer_traits<pointer>::difference_type)
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/**
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* @brief The allocator's difference type
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*
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* @c Alloc::difference_type if that type exists, otherwise
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* <tt> pointer_traits<pointer>::difference_type </tt>
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*/
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typedef __difference_type difference_type;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(size_type,
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typename make_unsigned<difference_type>::type)
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/**
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* @brief The allocator's size type
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*
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* @c Alloc::size_type if that type exists, otherwise
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* <tt> make_unsigned<difference_type>::type </tt>
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*/
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typedef __size_type size_type;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_copy_assignment,
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false_type)
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/**
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* @brief How the allocator is propagated on copy assignment
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*
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* @c Alloc::propagate_on_container_copy_assignment if that type exists,
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* otherwise @c false_type
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*/
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typedef __propagate_on_container_copy_assignment
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propagate_on_container_copy_assignment;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_move_assignment,
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false_type)
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/**
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* @brief How the allocator is propagated on move assignment
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*
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* @c Alloc::propagate_on_container_move_assignment if that type exists,
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* otherwise @c false_type
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*/
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typedef __propagate_on_container_move_assignment
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propagate_on_container_move_assignment;
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_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_swap,
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false_type)
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/**
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* @brief How the allocator is propagated on swap
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*
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* @c Alloc::propagate_on_container_swap if that type exists,
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* otherwise @c false_type
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*/
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typedef __propagate_on_container_swap propagate_on_container_swap;
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#undef _GLIBCXX_ALLOC_TR_NESTED_TYPE
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template<typename _Tp>
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using rebind_alloc = typename __alloctr_rebind<_Alloc, _Tp>::__type;
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template<typename _Tp>
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using rebind_traits = allocator_traits<rebind_alloc<_Tp>>;
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private:
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template<typename _Alloc2>
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struct __allocate_helper
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{
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template<typename _Alloc3,
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typename = decltype(std::declval<_Alloc3*>()->allocate(
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std::declval<size_type>(),
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std::declval<const_void_pointer>()))>
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static true_type __test(int);
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template<typename>
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static false_type __test(...);
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using type = decltype(__test<_Alloc>(0));
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};
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template<typename _Alloc2>
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using __has_allocate = typename __allocate_helper<_Alloc2>::type;
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template<typename _Alloc2,
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typename = _Require<__has_allocate<_Alloc2>>>
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static pointer
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_S_allocate(_Alloc2& __a, size_type __n, const_void_pointer __hint)
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{ return __a.allocate(__n, __hint); }
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template<typename _Alloc2, typename _UnusedHint,
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typename = _Require<__not_<__has_allocate<_Alloc2>>>>
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static pointer
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_S_allocate(_Alloc2& __a, size_type __n, _UnusedHint)
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{ return __a.allocate(__n); }
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template<typename _Tp, typename... _Args>
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struct __construct_helper
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{
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template<typename _Alloc2,
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typename = decltype(std::declval<_Alloc2*>()->construct(
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std::declval<_Tp*>(), std::declval<_Args>()...))>
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static true_type __test(int);
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template<typename>
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static false_type __test(...);
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using type = decltype(__test<_Alloc>(0));
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};
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template<typename _Tp, typename... _Args>
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using __has_construct
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= typename __construct_helper<_Tp, _Args...>::type;
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template<typename _Tp, typename... _Args>
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static _Require<__has_construct<_Tp, _Args...>>
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_S_construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
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{ __a.construct(__p, std::forward<_Args>(__args)...); }
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template<typename _Tp, typename... _Args>
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static
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_Require<__and_<__not_<__has_construct<_Tp, _Args...>>,
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is_constructible<_Tp, _Args...>>>
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_S_construct(_Alloc&, _Tp* __p, _Args&&... __args)
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{ ::new((void*)__p) _Tp(std::forward<_Args>(__args)...); }
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template<typename _Tp>
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struct __destroy_helper
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{
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template<typename _Alloc2,
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typename = decltype(std::declval<_Alloc2*>()->destroy(
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std::declval<_Tp*>()))>
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static true_type __test(int);
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template<typename>
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static false_type __test(...);
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using type = decltype(__test<_Alloc>(0));
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};
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template<typename _Tp>
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using __has_destroy = typename __destroy_helper<_Tp>::type;
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template<typename _Tp>
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static _Require<__has_destroy<_Tp>>
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_S_destroy(_Alloc& __a, _Tp* __p)
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{ __a.destroy(__p); }
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template<typename _Tp>
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static _Require<__not_<__has_destroy<_Tp>>>
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_S_destroy(_Alloc&, _Tp* __p)
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{ __p->~_Tp(); }
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template<typename _Alloc2>
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struct __maxsize_helper
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{
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template<typename _Alloc3,
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typename = decltype(std::declval<_Alloc3*>()->max_size())>
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static true_type __test(int);
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template<typename>
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static false_type __test(...);
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using type = decltype(__test<_Alloc2>(0));
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};
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template<typename _Alloc2>
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using __has_max_size = typename __maxsize_helper<_Alloc2>::type;
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template<typename _Alloc2,
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typename = _Require<__has_max_size<_Alloc2>>>
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static size_type
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_S_max_size(_Alloc2& __a, int)
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{ return __a.max_size(); }
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template<typename _Alloc2,
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typename = _Require<__not_<__has_max_size<_Alloc2>>>>
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static size_type
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_S_max_size(_Alloc2&, ...)
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{ return __gnu_cxx::__numeric_traits<size_type>::__max; }
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template<typename _Alloc2>
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struct __select_helper
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{
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template<typename _Alloc3, typename
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= decltype(std::declval<_Alloc3*>()
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->select_on_container_copy_construction())>
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static true_type __test(int);
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template<typename>
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static false_type __test(...);
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using type = decltype(__test<_Alloc2>(0));
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};
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template<typename _Alloc2>
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using __has_soccc = typename __select_helper<_Alloc2>::type;
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template<typename _Alloc2,
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typename = _Require<__has_soccc<_Alloc2>>>
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static _Alloc2
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_S_select(_Alloc2& __a, int)
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{ return __a.select_on_container_copy_construction(); }
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template<typename _Alloc2,
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typename = _Require<__not_<__has_soccc<_Alloc2>>>>
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static _Alloc2
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_S_select(_Alloc2& __a, ...)
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{ return __a; }
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public:
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/**
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* @brief Allocate memory.
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* @param __a An allocator.
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* @param __n The number of objects to allocate space for.
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*
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* Calls @c a.allocate(n)
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*/
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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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/**
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* @brief Allocate memory.
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* @param __a An allocator.
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* @param __n The number of objects to allocate space for.
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* @param __hint Aid to locality.
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* @return Memory of suitable size and alignment for @a n objects
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* of type @c value_type
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*
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* Returns <tt> a.allocate(n, hint) </tt> if that expression is
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* well-formed, otherwise returns @c a.allocate(n)
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*/
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static pointer
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allocate(_Alloc& __a, size_type __n, const_void_pointer __hint)
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{ return _S_allocate(__a, __n, __hint); }
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/**
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* @brief Deallocate memory.
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* @param __a An allocator.
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* @param __p Pointer to the memory to deallocate.
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* @param __n The number of objects space was allocated for.
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*
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* Calls <tt> a.deallocate(p, n) </tt>
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*/
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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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/**
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* @brief Construct an object of type @a _Tp
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* @param __a An allocator.
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* @param __p Pointer to memory of suitable size and alignment for Tp
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* @param __args Constructor arguments.
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*
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* Calls <tt> __a.construct(__p, std::forward<Args>(__args)...) </tt>
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* if that expression is well-formed, otherwise uses placement-new
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* to construct an object of type @a _Tp at location @a __p from the
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* arguments @a __args...
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*/
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template<typename _Tp, typename... _Args>
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static auto construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
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-> decltype(_S_construct(__a, __p, std::forward<_Args>(__args)...))
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{ _S_construct(__a, __p, std::forward<_Args>(__args)...); }
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/**
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* @brief Destroy an object of type @a _Tp
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* @param __a An allocator.
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* @param __p Pointer to the object to destroy
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*
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* Calls @c __a.destroy(__p) if that expression is well-formed,
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* otherwise calls @c __p->~_Tp()
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*/
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template <class _Tp>
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static void destroy(_Alloc& __a, _Tp* __p)
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{ _S_destroy(__a, __p); }
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/**
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* @brief The maximum supported allocation size
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* @param __a An allocator.
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* @return @c __a.max_size() or @c numeric_limits<size_type>::max()
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*
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* Returns @c __a.max_size() if that expression is well-formed,
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* otherwise returns @c numeric_limits<size_type>::max()
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*/
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static size_type max_size(const _Alloc& __a) noexcept
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{ return _S_max_size(__a, 0); }
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/**
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* @brief Obtain an allocator to use when copying a container.
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* @param __rhs An allocator.
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* @return @c __rhs.select_on_container_copy_construction() or @a __rhs
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*
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* Returns @c __rhs.select_on_container_copy_construction() if that
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* expression is well-formed, otherwise returns @a __rhs
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*/
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static _Alloc
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select_on_container_copy_construction(const _Alloc& __rhs)
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{ return _S_select(__rhs, 0); }
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};
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template<typename _Alloc>
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inline void
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__do_alloc_on_copy(_Alloc& __one, const _Alloc& __two, true_type)
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{ __one = __two; }
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template<typename _Alloc>
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inline void
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__do_alloc_on_copy(_Alloc&, const _Alloc&, false_type)
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{ }
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template<typename _Alloc>
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inline void __alloc_on_copy(_Alloc& __one, const _Alloc& __two)
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{
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typedef allocator_traits<_Alloc> __traits;
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typedef typename __traits::propagate_on_container_copy_assignment __pocca;
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__do_alloc_on_copy(__one, __two, __pocca());
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}
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template<typename _Alloc>
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inline _Alloc __alloc_on_copy(const _Alloc& __a)
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{
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typedef allocator_traits<_Alloc> __traits;
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return __traits::select_on_container_copy_construction(__a);
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}
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template<typename _Alloc>
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inline void __do_alloc_on_move(_Alloc& __one, _Alloc& __two, true_type)
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{ __one = std::move(__two); }
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template<typename _Alloc>
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inline void __do_alloc_on_move(_Alloc&, _Alloc&, false_type)
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{ }
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template<typename _Alloc>
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inline void __alloc_on_move(_Alloc& __one, _Alloc& __two)
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{
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typedef allocator_traits<_Alloc> __traits;
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typedef typename __traits::propagate_on_container_move_assignment __pocma;
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__do_alloc_on_move(__one, __two, __pocma());
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}
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template<typename _Alloc>
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inline void __do_alloc_on_swap(_Alloc& __one, _Alloc& __two, true_type)
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{
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using std::swap;
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swap(__one, __two);
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}
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template<typename _Alloc>
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inline void __do_alloc_on_swap(_Alloc&, _Alloc&, false_type)
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{ }
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template<typename _Alloc>
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inline void __alloc_on_swap(_Alloc& __one, _Alloc& __two)
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{
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typedef allocator_traits<_Alloc> __traits;
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typedef typename __traits::propagate_on_container_swap __pocs;
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__do_alloc_on_swap(__one, __two, __pocs());
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}
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template<typename _Alloc>
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class __is_copy_insertable_impl
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{
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typedef allocator_traits<_Alloc> _Traits;
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template<typename _Up, typename
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= decltype(_Traits::construct(std::declval<_Alloc&>(),
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std::declval<_Up*>(),
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std::declval<const _Up&>()))>
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static true_type
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|
_M_select(int);
|
|
|
|
template<typename _Up>
|
|
static false_type
|
|
_M_select(...);
|
|
|
|
public:
|
|
typedef decltype(_M_select<typename _Alloc::value_type>(0)) type;
|
|
};
|
|
|
|
// true if _Alloc::value_type is CopyInsertable into containers using _Alloc
|
|
template<typename _Alloc>
|
|
struct __is_copy_insertable
|
|
: __is_copy_insertable_impl<_Alloc>::type
|
|
{ };
|
|
|
|
// std::allocator<_Tp> just requires CopyConstructible
|
|
template<typename _Tp>
|
|
struct __is_copy_insertable<allocator<_Tp>>
|
|
: is_copy_constructible<_Tp>
|
|
{ };
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#endif
|
|
#endif
|