// -*- 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/construct_at.h>
#include <__memory/pointer_traits.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_empty.h>
#include <__type_traits/is_same.h>
#include <__type_traits/make_unsigned.h>
#include <__type_traits/remove_reference.h>
#include <__type_traits/void_t.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#include <cstddef>
#include <limits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#define _LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(NAME, PROPERTY) \
template <class _Tp, class = void> \
struct NAME : false_type {}; \
template <class _Tp> \
struct NAME<_Tp, __void_t<typename _Tp::PROPERTY > > : true_type {}
// __pointer
template <class _Tp,
class _Alloc,
class _RawAlloc = __libcpp_remove_reference_t<_Alloc>,
bool = __has_pointer<_RawAlloc>::value>
struct __pointer {
using type _LIBCPP_NODEBUG = typename _RawAlloc::pointer;
};
template <class _Tp, class _Alloc, class _RawAlloc>
struct __pointer<_Tp, _Alloc, _RawAlloc, false> {
using type _LIBCPP_NODEBUG = _Tp*;
};
// __const_pointer
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_const_pointer, const_pointer);
template <class _Tp, class _Ptr, class _Alloc, bool = __has_const_pointer<_Alloc>::value>
struct __const_pointer {
using type _LIBCPP_NODEBUG = typename _Alloc::const_pointer;
};
template <class _Tp, class _Ptr, class _Alloc>
struct __const_pointer<_Tp, _Ptr, _Alloc, false> {
#ifdef _LIBCPP_CXX03_LANG
using type = typename pointer_traits<_Ptr>::template rebind<const _Tp>::other;
#else
using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<const _Tp>;
#endif
};
// __void_pointer
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_void_pointer, void_pointer);
template <class _Ptr, class _Alloc, bool = __has_void_pointer<_Alloc>::value>
struct __void_pointer {
using type _LIBCPP_NODEBUG = typename _Alloc::void_pointer;
};
template <class _Ptr, class _Alloc>
struct __void_pointer<_Ptr, _Alloc, false> {
#ifdef _LIBCPP_CXX03_LANG
using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<void>::other;
#else
using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<void>;
#endif
};
// __const_void_pointer
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_const_void_pointer, const_void_pointer);
template <class _Ptr, class _Alloc, bool = __has_const_void_pointer<_Alloc>::value>
struct __const_void_pointer {
using type _LIBCPP_NODEBUG = typename _Alloc::const_void_pointer;
};
template <class _Ptr, class _Alloc>
struct __const_void_pointer<_Ptr, _Alloc, false> {
#ifdef _LIBCPP_CXX03_LANG
using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<const void>::other;
#else
using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::template rebind<const void>;
#endif
};
// __size_type
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_size_type, size_type);
template <class _Alloc, class _DiffType, bool = __has_size_type<_Alloc>::value>
struct __size_type : make_unsigned<_DiffType> {};
template <class _Alloc, class _DiffType>
struct __size_type<_Alloc, _DiffType, true> {
using type _LIBCPP_NODEBUG = typename _Alloc::size_type;
};
// __alloc_traits_difference_type
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_alloc_traits_difference_type, difference_type);
template <class _Alloc, class _Ptr, bool = __has_alloc_traits_difference_type<_Alloc>::value>
struct __alloc_traits_difference_type {
using type _LIBCPP_NODEBUG = typename pointer_traits<_Ptr>::difference_type;
};
template <class _Alloc, class _Ptr>
struct __alloc_traits_difference_type<_Alloc, _Ptr, true> {
using type _LIBCPP_NODEBUG = typename _Alloc::difference_type;
};
// __propagate_on_container_copy_assignment
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_propagate_on_container_copy_assignment, propagate_on_container_copy_assignment);
template <class _Alloc, bool = __has_propagate_on_container_copy_assignment<_Alloc>::value>
struct __propagate_on_container_copy_assignment : false_type {};
template <class _Alloc>
struct __propagate_on_container_copy_assignment<_Alloc, true> {
using type _LIBCPP_NODEBUG = typename _Alloc::propagate_on_container_copy_assignment;
};
// __propagate_on_container_move_assignment
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_propagate_on_container_move_assignment, propagate_on_container_move_assignment);
template <class _Alloc, bool = __has_propagate_on_container_move_assignment<_Alloc>::value>
struct __propagate_on_container_move_assignment : false_type {};
template <class _Alloc>
struct __propagate_on_container_move_assignment<_Alloc, true> {
using type _LIBCPP_NODEBUG = typename _Alloc::propagate_on_container_move_assignment;
};
// __propagate_on_container_swap
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_propagate_on_container_swap, propagate_on_container_swap);
template <class _Alloc, bool = __has_propagate_on_container_swap<_Alloc>::value>
struct __propagate_on_container_swap : false_type {};
template <class _Alloc>
struct __propagate_on_container_swap<_Alloc, true> {
using type _LIBCPP_NODEBUG = typename _Alloc::propagate_on_container_swap;
};
// __is_always_equal
_LIBCPP_ALLOCATOR_TRAITS_HAS_XXX(__has_is_always_equal, is_always_equal);
template <class _Alloc, bool = __has_is_always_equal<_Alloc>::value>
struct __is_always_equal : is_empty<_Alloc> {};
template <class _Alloc>
struct __is_always_equal<_Alloc, true> {
using type _LIBCPP_NODEBUG = typename _Alloc::is_always_equal;
};
// __allocator_traits_rebind
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Tp, class _Up, class = void>
struct __has_rebind_other : false_type {};
template <class _Tp, class _Up>
struct __has_rebind_other<_Tp, _Up, __void_t<typename _Tp::template rebind<_Up>::other> > : true_type {};
template <class _Tp, class _Up, bool = __has_rebind_other<_Tp, _Up>::value>
struct __allocator_traits_rebind {
static_assert(__has_rebind_other<_Tp, _Up>::value, "This allocator has to implement rebind");
using type _LIBCPP_NODEBUG = typename _Tp::template rebind<_Up>::other;
};
template <template <class, class...> class _Alloc, class _Tp, class... _Args, class _Up>
struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, true> {
using type _LIBCPP_NODEBUG = typename _Alloc<_Tp, _Args...>::template rebind<_Up>::other;
};
template <template <class, class...> class _Alloc, class _Tp, class... _Args, class _Up>
struct __allocator_traits_rebind<_Alloc<_Tp, _Args...>, _Up, false> {
using type _LIBCPP_NODEBUG = _Alloc<_Up, _Args...>;
};
_LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Alloc, class _Tp>
using __allocator_traits_rebind_t = typename __allocator_traits_rebind<_Alloc, _Tp>::type;
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
// __has_allocate_hint
template <class _Alloc, class _SizeType, class _ConstVoidPtr, class = void>
struct __has_allocate_hint : false_type {};
template <class _Alloc, class _SizeType, class _ConstVoidPtr>
struct __has_allocate_hint<
_Alloc,
_SizeType,
_ConstVoidPtr,
decltype((void)std::declval<_Alloc>().allocate(std::declval<_SizeType>(), std::declval<_ConstVoidPtr>()))>
: true_type {};
// __has_construct
template <class, class _Alloc, class... _Args>
struct __has_construct_impl : false_type {};
template <class _Alloc, class... _Args>
struct __has_construct_impl<decltype((void)std::declval<_Alloc>().construct(std::declval<_Args>()...)),
_Alloc,
_Args...> : true_type {};
template <class _Alloc, class... _Args>
struct __has_construct : __has_construct_impl<void, _Alloc, _Args...> {};
// __has_destroy
template <class _Alloc, class _Pointer, class = void>
struct __has_destroy : false_type {};
template <class _Alloc, class _Pointer>
struct __has_destroy<_Alloc, _Pointer, decltype((void)std::declval<_Alloc>().destroy(std::declval<_Pointer>()))>
: true_type {};
// __has_max_size
template <class _Alloc, class = void>
struct __has_max_size : false_type {};
template <class _Alloc>
struct __has_max_size<_Alloc, decltype((void)std::declval<_Alloc&>().max_size())> : true_type {};
// __has_select_on_container_copy_construction
template <class _Alloc, class = void>
struct __has_select_on_container_copy_construction : false_type {};
template <class _Alloc>
struct __has_select_on_container_copy_construction<
_Alloc,
decltype((void)std::declval<_Alloc>().select_on_container_copy_construction())> : true_type {};
_LIBCPP_SUPPRESS_DEPRECATED_POP
#if _LIBCPP_STD_VER >= 23
template <class _Pointer, class _SizeType = size_t>
struct allocation_result {
_Pointer ptr;
_SizeType count;
};
_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(allocation_result);
#endif // _LIBCPP_STD_VER
template <class _Alloc>
struct _LIBCPP_TEMPLATE_VIS allocator_traits {
using allocator_type = _Alloc;
using value_type = typename allocator_type::value_type;
using pointer = typename __pointer<value_type, allocator_type>::type;
using const_pointer = typename __const_pointer<value_type, pointer, allocator_type>::type;
using void_pointer = typename __void_pointer<pointer, allocator_type>::type;
using const_void_pointer = typename __const_void_pointer<pointer, allocator_type>::type;
using difference_type = typename __alloc_traits_difference_type<allocator_type, pointer>::type;
using size_type = typename __size_type<allocator_type, difference_type>::type;
using propagate_on_container_copy_assignment =
typename __propagate_on_container_copy_assignment<allocator_type>::type;
using propagate_on_container_move_assignment =
typename __propagate_on_container_move_assignment<allocator_type>::type;
using propagate_on_container_swap = typename __propagate_on_container_swap<allocator_type>::type;
using is_always_equal = typename __is_always_equal<allocator_type>::type;
#ifndef _LIBCPP_CXX03_LANG
template <class _Tp>
using rebind_alloc = __allocator_traits_rebind_t<allocator_type, _Tp>;
template <class _Tp>
using rebind_traits = allocator_traits<rebind_alloc<_Tp> >;
#else // _LIBCPP_CXX03_LANG
template <class _Tp>
struct rebind_alloc {
using other = __allocator_traits_rebind_t<allocator_type, _Tp>;
};
template <class _Tp>
struct rebind_traits {
using other = allocator_traits<typename rebind_alloc<_Tp>::other>;
};
#endif // _LIBCPP_CXX03_LANG
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static pointer
allocate(allocator_type& __a, size_type __n) {
return __a.allocate(__n);
}
template <class _Ap = _Alloc, __enable_if_t<__has_allocate_hint<_Ap, size_type, const_void_pointer>::value, int> = 0>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static pointer
allocate(allocator_type& __a, size_type __n, const_void_pointer __hint) {
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
return __a.allocate(__n, __hint);
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
template <class _Ap = _Alloc,
class = void,
__enable_if_t<!__has_allocate_hint<_Ap, size_type, const_void_pointer>::value, int> = 0>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static pointer
allocate(allocator_type& __a, size_type __n, const_void_pointer) {
return __a.allocate(__n);
}
#if _LIBCPP_STD_VER >= 23
template <class _Ap = _Alloc>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr allocation_result<pointer, size_type>
allocate_at_least(_Ap& __alloc, size_type __n) {
if constexpr (requires { __alloc.allocate_at_least(__n); }) {
return __alloc.allocate_at_least(__n);
} else {
return {__alloc.allocate(__n), __n};
}
}
#endif
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static void
deallocate(allocator_type& __a, pointer __p, size_type __n) _NOEXCEPT {
__a.deallocate(__p, __n);
}
template <class _Tp, class... _Args, __enable_if_t<__has_construct<allocator_type, _Tp*, _Args...>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static void
construct(allocator_type& __a, _Tp* __p, _Args&&... __args) {
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
__a.construct(__p, std::forward<_Args>(__args)...);
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
template <class _Tp,
class... _Args,
class = void,
__enable_if_t<!__has_construct<allocator_type, _Tp*, _Args...>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static void
construct(allocator_type&, _Tp* __p, _Args&&... __args) {
std::__construct_at(__p, std::forward<_Args>(__args)...);
}
template <class _Tp, __enable_if_t<__has_destroy<allocator_type, _Tp*>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static void destroy(allocator_type& __a, _Tp* __p) {
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
__a.destroy(__p);
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
template <class _Tp, class = void, __enable_if_t<!__has_destroy<allocator_type, _Tp*>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static void destroy(allocator_type&, _Tp* __p) {
std::__destroy_at(__p);
}
template <class _Ap = _Alloc, __enable_if_t<__has_max_size<const _Ap>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static size_type max_size(const allocator_type& __a) _NOEXCEPT {
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
return __a.max_size();
_LIBCPP_SUPPRESS_DEPRECATED_POP
}
template <class _Ap = _Alloc, class = void, __enable_if_t<!__has_max_size<const _Ap>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static size_type max_size(const allocator_type&) _NOEXCEPT {
return numeric_limits<size_type>::max() / sizeof(value_type);
}
template <class _Ap = _Alloc, __enable_if_t<__has_select_on_container_copy_construction<const _Ap>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static allocator_type
select_on_container_copy_construction(const allocator_type& __a) {
return __a.select_on_container_copy_construction();
}
template <class _Ap = _Alloc,
class = void,
__enable_if_t<!__has_select_on_container_copy_construction<const _Ap>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static allocator_type
select_on_container_copy_construction(const allocator_type& __a) {
return __a;
}
};
#ifndef _LIBCPP_CXX03_LANG
template <class _Traits, class _Tp>
using __rebind_alloc _LIBCPP_NODEBUG = typename _Traits::template rebind_alloc<_Tp>;
#else
template <class _Traits, class _Tp>
using __rebind_alloc = typename _Traits::template rebind_alloc<_Tp>::other;
#endif
template <class _Alloc>
struct __check_valid_allocator : true_type {
using _Traits = std::allocator_traits<_Alloc>;
static_assert(is_same<_Alloc, __rebind_alloc<_Traits, typename _Traits::value_type> >::value,
"[allocator.requirements] states that rebinding an allocator to the same type should result in the "
"original allocator");
};
// __is_default_allocator
template <class _Tp>
struct __is_default_allocator : false_type {};
template <class>
class allocator;
template <class _Tp>
struct __is_default_allocator<allocator<_Tp> > : true_type {};
// __is_cpp17_move_insertable
template <class _Alloc, class = void>
struct __is_cpp17_move_insertable : is_move_constructible<typename _Alloc::value_type> {};
template <class _Alloc>
struct __is_cpp17_move_insertable<
_Alloc,
__enable_if_t< !__is_default_allocator<_Alloc>::value &&
__has_construct<_Alloc, typename _Alloc::value_type*, typename _Alloc::value_type&&>::value > >
: true_type {};
// __is_cpp17_copy_insertable
template <class _Alloc, class = void>
struct __is_cpp17_copy_insertable
: integral_constant<bool,
is_copy_constructible<typename _Alloc::value_type>::value &&
__is_cpp17_move_insertable<_Alloc>::value > {};
template <class _Alloc>
struct __is_cpp17_copy_insertable<
_Alloc,
__enable_if_t< !__is_default_allocator<_Alloc>::value &&
__has_construct<_Alloc, typename _Alloc::value_type*, const typename _Alloc::value_type&>::value > >
: __is_cpp17_move_insertable<_Alloc> {};
#undef _LIBCPP_ALLOCATOR_TRAITS_HAS_XXX
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___MEMORY_ALLOCATOR_TRAITS_H
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