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llvm-project/libcxx/include/__memory/allocator_traits.h

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___MEMORY_ALLOCATOR_TRAITS_H
#define _LIBCPP___MEMORY_ALLOCATOR_TRAITS_H
#include <__config>
#include <__memory/base.h>
#include <__memory/pointer_traits.h>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp, class = void>
struct __has_pointer_type : false_type {};
template <class _Tp>
struct __has_pointer_type<_Tp,
typename __void_t<typename _Tp::pointer>::type> : true_type {};
namespace __pointer_type_imp
{
template <class _Tp, class _Dp, bool = __has_pointer_type<_Dp>::value>
struct __pointer_type
{
typedef _LIBCPP_NODEBUG_TYPE typename _Dp::pointer type;
};
template <class _Tp, class _Dp>
struct __pointer_type<_Tp, _Dp, false>
{
typedef _LIBCPP_NODEBUG_TYPE _Tp* type;
};
} // __pointer_type_imp
template <class _Tp, class _Dp>
struct __pointer_type
{
typedef _LIBCPP_NODEBUG_TYPE typename __pointer_type_imp::__pointer_type<_Tp, typename remove_reference<_Dp>::type>::type type;
};
template <class _Tp, class = void>
struct __has_const_pointer : false_type {};
template <class _Tp>
struct __has_const_pointer<_Tp,
typename __void_t<typename _Tp::const_pointer>::type> : true_type {};
template <class _Tp, class _Ptr, class _Alloc, bool = __has_const_pointer<_Alloc>::value>
struct __const_pointer
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::const_pointer type;
};
template <class _Tp, class _Ptr, class _Alloc>
struct __const_pointer<_Tp, _Ptr, _Alloc, false>
{
#ifndef _LIBCPP_CXX03_LANG
typedef _LIBCPP_NODEBUG_TYPE typename pointer_traits<_Ptr>::template rebind<const _Tp> type;
#else
typedef typename pointer_traits<_Ptr>::template rebind<const _Tp>::other type;
#endif
};
template <class _Tp, class = void>
struct __has_void_pointer : false_type {};
template <class _Tp>
struct __has_void_pointer<_Tp,
typename __void_t<typename _Tp::void_pointer>::type> : true_type {};
template <class _Ptr, class _Alloc, bool = __has_void_pointer<_Alloc>::value>
struct __void_pointer
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::void_pointer type;
};
template <class _Ptr, class _Alloc>
struct __void_pointer<_Ptr, _Alloc, false>
{
#ifndef _LIBCPP_CXX03_LANG
typedef _LIBCPP_NODEBUG_TYPE typename pointer_traits<_Ptr>::template rebind<void> type;
#else
typedef _LIBCPP_NODEBUG_TYPE typename pointer_traits<_Ptr>::template rebind<void>::other type;
#endif
};
template <class _Tp, class = void>
struct __has_const_void_pointer : false_type {};
template <class _Tp>
struct __has_const_void_pointer<_Tp,
typename __void_t<typename _Tp::const_void_pointer>::type> : true_type {};
template <class _Ptr, class _Alloc, bool = __has_const_void_pointer<_Alloc>::value>
struct __const_void_pointer
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::const_void_pointer type;
};
template <class _Ptr, class _Alloc>
struct __const_void_pointer<_Ptr, _Alloc, false>
{
#ifndef _LIBCPP_CXX03_LANG
typedef _LIBCPP_NODEBUG_TYPE typename pointer_traits<_Ptr>::template rebind<const void> type;
#else
typedef _LIBCPP_NODEBUG_TYPE typename pointer_traits<_Ptr>::template rebind<const void>::other type;
#endif
};
template <class _Tp, class = void>
struct __has_size_type : false_type {};
template <class _Tp>
struct __has_size_type<_Tp,
typename __void_t<typename _Tp::size_type>::type> : true_type {};
template <class _Alloc, class _DiffType, bool = __has_size_type<_Alloc>::value>
struct __size_type
{
typedef _LIBCPP_NODEBUG_TYPE typename make_unsigned<_DiffType>::type type;
};
template <class _Alloc, class _DiffType>
struct __size_type<_Alloc, _DiffType, true>
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::size_type type;
};
template <class _Tp, class = void>
struct __has_propagate_on_container_copy_assignment : false_type {};
template <class _Tp>
struct __has_propagate_on_container_copy_assignment<_Tp,
typename __void_t<typename _Tp::propagate_on_container_copy_assignment>::type>
: true_type {};
template <class _Alloc, bool = __has_propagate_on_container_copy_assignment<_Alloc>::value>
struct __propagate_on_container_copy_assignment
{
typedef _LIBCPP_NODEBUG_TYPE false_type type;
};
template <class _Alloc>
struct __propagate_on_container_copy_assignment<_Alloc, true>
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::propagate_on_container_copy_assignment type;
};
template <class _Tp, class = void>
struct __has_propagate_on_container_move_assignment : false_type {};
template <class _Tp>
struct __has_propagate_on_container_move_assignment<_Tp,
typename __void_t<typename _Tp::propagate_on_container_move_assignment>::type>
: true_type {};
template <class _Alloc, bool = __has_propagate_on_container_move_assignment<_Alloc>::value>
struct __propagate_on_container_move_assignment
{
typedef false_type type;
};
template <class _Alloc>
struct __propagate_on_container_move_assignment<_Alloc, true>
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::propagate_on_container_move_assignment type;
};
template <class _Tp, class = void>
struct __has_propagate_on_container_swap : false_type {};
template <class _Tp>
struct __has_propagate_on_container_swap<_Tp,
typename __void_t<typename _Tp::propagate_on_container_swap>::type>
: true_type {};
template <class _Alloc, bool = __has_propagate_on_container_swap<_Alloc>::value>
struct __propagate_on_container_swap
{
typedef false_type type;
};
template <class _Alloc>
struct __propagate_on_container_swap<_Alloc, true>
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::propagate_on_container_swap type;
};
template <class _Tp, class = void>
struct __has_is_always_equal : false_type {};
template <class _Tp>
struct __has_is_always_equal<_Tp,
typename __void_t<typename _Tp::is_always_equal>::type>
: true_type {};
template <class _Alloc, bool = __has_is_always_equal<_Alloc>::value>
struct __is_always_equal
{
typedef _LIBCPP_NODEBUG_TYPE typename _VSTD::is_empty<_Alloc>::type type;
};
template <class _Alloc>
struct __is_always_equal<_Alloc, true>
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::is_always_equal type;
};
template <class _Tp, class _Up, bool = __has_rebind<_Tp, _Up>::value>
struct __has_rebind_other
{
private:
struct __two {char __lx; char __lxx;};
template <class _Xp> static __two __test(...);
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Xp> static char __test(typename _Xp::template rebind<_Up>::other* = 0);
_LIBCPP_SUPPRESS_DEPRECATED_POP
public:
static const bool value = sizeof(__test<_Tp>(0)) == 1;
};
template <class _Tp, class _Up>
struct __has_rebind_other<_Tp, _Up, false>
{
static const bool value = false;
};
template <class _Tp, class _Up, bool = __has_rebind_other<_Tp, _Up>::value>
struct __allocator_traits_rebind
{
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up>::other type;
_LIBCPP_SUPPRESS_DEPRECATED_POP
};
template <template <class, class...> class _Alloc, class _Tp, class ..._Args, class _Up>
struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, true>
{
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc<_Tp, _Args...>::template rebind<_Up>::other type;
_LIBCPP_SUPPRESS_DEPRECATED_POP
};
template <template <class, class...> class _Alloc, class _Tp, class ..._Args, class _Up>
struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, false>
{
typedef _LIBCPP_NODEBUG_TYPE _Alloc<_Up, _Args...> type;
};
#ifndef _LIBCPP_CXX03_LANG
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Alloc, class _SizeType, class _ConstVoidPtr>
auto
__has_allocate_hint_test(_Alloc&& __a, _SizeType&& __sz, _ConstVoidPtr&& __p)
-> decltype((void)__a.allocate(__sz, __p), true_type());
_LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Alloc, class _SizeType, class _ConstVoidPtr>
auto
__has_allocate_hint_test(const _Alloc& __a, _SizeType&& __sz, _ConstVoidPtr&& __p)
-> false_type;
template <class _Alloc, class _SizeType, class _ConstVoidPtr>
struct __has_allocate_hint
: decltype(_VSTD::__has_allocate_hint_test(declval<_Alloc>(),
declval<_SizeType>(),
declval<_ConstVoidPtr>()))
{
};
#else // _LIBCPP_CXX03_LANG
template <class _Alloc, class _SizeType, class _ConstVoidPtr>
struct __has_allocate_hint
: true_type
{
};
#endif // _LIBCPP_CXX03_LANG
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Alloc, class ..._Args,
class = decltype(_VSTD::declval<_Alloc>().construct(_VSTD::declval<_Args>()...))>
static true_type __test_has_construct(int);
_LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Alloc, class...>
static false_type __test_has_construct(...);
template <class _Alloc, class ..._Args>
struct __has_construct : decltype(__test_has_construct<_Alloc, _Args...>(0)) {};
#if !defined(_LIBCPP_CXX03_LANG)
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Alloc, class _Pointer>
auto
__has_destroy_test(_Alloc&& __a, _Pointer&& __p)
-> decltype(__a.destroy(__p), true_type());
_LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Alloc, class _Pointer>
auto
__has_destroy_test(const _Alloc& __a, _Pointer&& __p)
-> false_type;
template <class _Alloc, class _Pointer>
struct __has_destroy
: decltype(_VSTD::__has_destroy_test(declval<_Alloc>(),
declval<_Pointer>()))
{
};
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Alloc>
auto
__has_max_size_test(_Alloc&& __a)
-> decltype(__a.max_size(), true_type());
_LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Alloc>
auto
__has_max_size_test(const volatile _Alloc& __a)
-> false_type;
template <class _Alloc>
struct __has_max_size
: decltype(_VSTD::__has_max_size_test(declval<_Alloc&>()))
{
};
template <class _Alloc>
auto
__has_select_on_container_copy_construction_test(_Alloc&& __a)
-> decltype(__a.select_on_container_copy_construction(), true_type());
template <class _Alloc>
auto
__has_select_on_container_copy_construction_test(const volatile _Alloc& __a)
-> false_type;
template <class _Alloc>
struct __has_select_on_container_copy_construction
: decltype(_VSTD::__has_select_on_container_copy_construction_test(declval<_Alloc&>()))
{
};
#else // _LIBCPP_CXX03_LANG
template <class _Alloc, class _Pointer, class = void>
struct __has_destroy : false_type {};
template <class _Alloc, class _Pointer>
struct __has_destroy<_Alloc, _Pointer, typename __void_t<
decltype(_VSTD::declval<_Alloc>().destroy(_VSTD::declval<_Pointer>()))
>::type> : true_type {};
template <class _Alloc>
struct __has_max_size
: true_type
{
};
template <class _Alloc>
struct __has_select_on_container_copy_construction
: false_type
{
};
#endif // _LIBCPP_CXX03_LANG
template <class _Alloc, class _Ptr, bool = __has_difference_type<_Alloc>::value>
struct __alloc_traits_difference_type
{
typedef _LIBCPP_NODEBUG_TYPE typename pointer_traits<_Ptr>::difference_type type;
};
template <class _Alloc, class _Ptr>
struct __alloc_traits_difference_type<_Alloc, _Ptr, true>
{
typedef _LIBCPP_NODEBUG_TYPE typename _Alloc::difference_type type;
};
template <class _Tp>
struct __is_default_allocator : false_type {};
template <class _Tp>
struct __is_default_allocator<_VSTD::allocator<_Tp> > : true_type {};
template <class _Alloc,
bool = __has_construct<_Alloc, typename _Alloc::value_type*, typename _Alloc::value_type&&>::value && !__is_default_allocator<_Alloc>::value
>
struct __is_cpp17_move_insertable;
template <class _Alloc>
struct __is_cpp17_move_insertable<_Alloc, true> : true_type {};
template <class _Alloc>
struct __is_cpp17_move_insertable<_Alloc, false> : is_move_constructible<typename _Alloc::value_type> {};
template <class _Alloc,
bool = __has_construct<_Alloc, typename _Alloc::value_type*, const typename _Alloc::value_type&>::value && !__is_default_allocator<_Alloc>::value
>
struct __is_cpp17_copy_insertable;
template <class _Alloc>
struct __is_cpp17_copy_insertable<_Alloc, true> : __is_cpp17_move_insertable<_Alloc> {};
template <class _Alloc>
struct __is_cpp17_copy_insertable<_Alloc, false> : integral_constant<bool,
is_copy_constructible<typename _Alloc::value_type>::value &&
__is_cpp17_move_insertable<_Alloc>::value>
{};
template <class _Alloc>
struct _LIBCPP_TEMPLATE_VIS allocator_traits
{
typedef _Alloc allocator_type;
typedef typename allocator_type::value_type value_type;
typedef typename __pointer_type<value_type, allocator_type>::type pointer;
typedef typename __const_pointer<value_type, pointer, allocator_type>::type const_pointer;
typedef typename __void_pointer<pointer, allocator_type>::type void_pointer;
typedef typename __const_void_pointer<pointer, allocator_type>::type const_void_pointer;
typedef typename __alloc_traits_difference_type<allocator_type, pointer>::type difference_type;
typedef typename __size_type<allocator_type, difference_type>::type size_type;
typedef typename __propagate_on_container_copy_assignment<allocator_type>::type
propagate_on_container_copy_assignment;
typedef typename __propagate_on_container_move_assignment<allocator_type>::type
propagate_on_container_move_assignment;
typedef typename __propagate_on_container_swap<allocator_type>::type
propagate_on_container_swap;
typedef typename __is_always_equal<allocator_type>::type
is_always_equal;
#ifndef _LIBCPP_CXX03_LANG
template <class _Tp> using rebind_alloc =
typename __allocator_traits_rebind<allocator_type, _Tp>::type;
template <class _Tp> using rebind_traits = allocator_traits<rebind_alloc<_Tp> >;
#else // _LIBCPP_CXX03_LANG
template <class _Tp> struct rebind_alloc
{typedef typename __allocator_traits_rebind<allocator_type, _Tp>::type other;};
template <class _Tp> struct rebind_traits
{typedef allocator_traits<typename rebind_alloc<_Tp>::other> other;};
#endif // _LIBCPP_CXX03_LANG
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static pointer allocate(allocator_type& __a, size_type __n)
{return __a.allocate(__n);}
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static pointer allocate(allocator_type& __a, size_type __n, const_void_pointer __hint)
{return __allocate(__a, __n, __hint,
__has_allocate_hint<allocator_type, size_type, const_void_pointer>());}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static void deallocate(allocator_type& __a, pointer __p, size_type __n) _NOEXCEPT
{__a.deallocate(__p, __n);}
template <class _Tp, class... _Args>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static void construct(allocator_type& __a, _Tp* __p, _Args&&... __args)
{__construct(__has_construct<allocator_type, _Tp*, _Args...>(),
__a, __p, _VSTD::forward<_Args>(__args)...);}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static void destroy(allocator_type& __a, _Tp* __p)
{__destroy(__has_destroy<allocator_type, _Tp*>(), __a, __p);}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static size_type max_size(const allocator_type& __a) _NOEXCEPT
{return __max_size(__has_max_size<const allocator_type>(), __a);}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static allocator_type
select_on_container_copy_construction(const allocator_type& __a)
{return __select_on_container_copy_construction(
__has_select_on_container_copy_construction<const allocator_type>(),
__a);}
private:
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static pointer __allocate(allocator_type& __a, size_type __n,
const_void_pointer __hint, true_type)
{
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
return __a.allocate(__n, __hint);
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static pointer __allocate(allocator_type& __a, size_type __n,
const_void_pointer, false_type)
{return __a.allocate(__n);}
template <class _Tp, class... _Args>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static void __construct(true_type, allocator_type& __a, _Tp* __p, _Args&&... __args)
{
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
__a.construct(__p, _VSTD::forward<_Args>(__args)...);
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
template <class _Tp, class... _Args>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static void __construct(false_type, allocator_type&, _Tp* __p, _Args&&... __args)
{
#if _LIBCPP_STD_VER > 17
_VSTD::construct_at(__p, _VSTD::forward<_Args>(__args)...);
#else
::new ((void*)__p) _Tp(_VSTD::forward<_Args>(__args)...);
#endif
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static void __destroy(true_type, allocator_type& __a, _Tp* __p)
{
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
__a.destroy(__p);
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static void __destroy(false_type, allocator_type&, _Tp* __p)
{
#if _LIBCPP_STD_VER > 17
_VSTD::destroy_at(__p);
#else
__p->~_Tp();
#endif
}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static size_type __max_size(true_type, const allocator_type& __a) _NOEXCEPT
{
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
return __a.max_size();
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static size_type __max_size(false_type, const allocator_type&) _NOEXCEPT
{return numeric_limits<size_type>::max() / sizeof(value_type);}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static allocator_type
__select_on_container_copy_construction(true_type, const allocator_type& __a)
{return __a.select_on_container_copy_construction();}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
static allocator_type
__select_on_container_copy_construction(false_type, const allocator_type& __a)
{return __a;}
};
template <class _Traits, class _Tp>
struct __rebind_alloc_helper
{
#ifndef _LIBCPP_CXX03_LANG
typedef _LIBCPP_NODEBUG_TYPE typename _Traits::template rebind_alloc<_Tp> type;
#else
typedef typename _Traits::template rebind_alloc<_Tp>::other type;
#endif
};
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___MEMORY_ALLOCATOR_TRAITS_H
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