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uses_allocator_construction.h
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uses_allocator_construction.h
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//===----------------------------------------------------------------------===//
//
// 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_USES_ALLOCATOR_CONSTRUCTION_H
#define _LIBCPP___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H
#include <__config>
#include <__memory/construct_at.h>
#include <__memory/uses_allocator.h>
#include <__tuple/tuple_like_no_subrange.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_same.h>
#include <__type_traits/remove_cv.h>
#include <__utility/declval.h>
#include <__utility/pair.h>
#include <tuple>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 17
template <class _Type>
inline constexpr bool __is_std_pair = false;
template <class _Type1, class _Type2>
inline constexpr bool __is_std_pair<pair<_Type1, _Type2>> = true;
template <class _Tp>
inline constexpr bool __is_cv_std_pair = __is_std_pair<remove_cv_t<_Tp>>;
template <class _Tp, class = void>
struct __uses_allocator_construction_args;
namespace __uses_allocator_detail {
template <class _Ap, class _Bp>
void __fun(const pair<_Ap, _Bp>&);
template <class _Tp>
decltype(__uses_allocator_detail::__fun(std::declval<_Tp>()), true_type()) __convertible_to_const_pair_ref_impl(int);
template <class>
false_type __convertible_to_const_pair_ref_impl(...);
template <class _Tp>
inline constexpr bool __convertible_to_const_pair_ref =
decltype(__uses_allocator_detail::__convertible_to_const_pair_ref_impl<_Tp>(0))::value;
# if _LIBCPP_STD_VER >= 23
template <class _Tp, class _Up>
inline constexpr bool __uses_allocator_constraints =
__is_cv_std_pair<_Tp> && !__pair_like_no_subrange<_Up> && !__convertible_to_const_pair_ref<_Up>;
# else
template <class _Tp, class _Up>
inline constexpr bool __uses_allocator_constraints = __is_cv_std_pair<_Tp> && !__convertible_to_const_pair_ref<_Up>;
# endif
} // namespace __uses_allocator_detail
template <class _Type, class _Alloc, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr _Type __make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args);
template <class _Pair>
struct __uses_allocator_construction_args<_Pair, __enable_if_t<__is_cv_std_pair<_Pair>>> {
template <class _Alloc, class _Tuple1, class _Tuple2>
static _LIBCPP_HIDE_FROM_ABI constexpr auto
__apply(const _Alloc& __alloc, piecewise_construct_t, _Tuple1&& __x, _Tuple2&& __y) noexcept {
return std::make_tuple(
piecewise_construct,
std::apply(
[&__alloc](auto&&... __args1) {
return __uses_allocator_construction_args<typename _Pair::first_type>::__apply(
__alloc, std::forward<decltype(__args1)>(__args1)...);
},
std::forward<_Tuple1>(__x)),
std::apply(
[&__alloc](auto&&... __args2) {
return __uses_allocator_construction_args<typename _Pair::second_type>::__apply(
__alloc, std::forward<decltype(__args2)>(__args2)...);
},
std::forward<_Tuple2>(__y)));
}
template <class _Alloc>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc) noexcept {
return __uses_allocator_construction_args<_Pair>::__apply(__alloc, piecewise_construct, tuple<>{}, tuple<>{});
}
template <class _Alloc, class _Up, class _Vp>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, _Up&& __u, _Vp&& __v) noexcept {
return __uses_allocator_construction_args<_Pair>::__apply(
__alloc,
piecewise_construct,
std::forward_as_tuple(std::forward<_Up>(__u)),
std::forward_as_tuple(std::forward<_Vp>(__v)));
}
# if _LIBCPP_STD_VER >= 23
template <class _Alloc, class _Up, class _Vp>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, pair<_Up, _Vp>& __pair) noexcept {
return __uses_allocator_construction_args<_Pair>::__apply(
__alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second));
}
# endif
template <class _Alloc, class _Up, class _Vp>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, const pair<_Up, _Vp>& __pair) noexcept {
return __uses_allocator_construction_args<_Pair>::__apply(
__alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second));
}
template <class _Alloc, class _Up, class _Vp>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, pair<_Up, _Vp>&& __pair) noexcept {
return __uses_allocator_construction_args<_Pair>::__apply(
__alloc,
piecewise_construct,
std::forward_as_tuple(std::get<0>(std::move(__pair))),
std::forward_as_tuple(std::get<1>(std::move(__pair))));
}
# if _LIBCPP_STD_VER >= 23
template <class _Alloc, class _Up, class _Vp>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, const pair<_Up, _Vp>&& __pair) noexcept {
return __uses_allocator_construction_args<_Pair>::__apply(
__alloc,
piecewise_construct,
std::forward_as_tuple(std::get<0>(std::move(__pair))),
std::forward_as_tuple(std::get<1>(std::move(__pair))));
}
template < class _Alloc, __pair_like_no_subrange _PairLike>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, _PairLike&& __p) noexcept {
return __uses_allocator_construction_args<_Pair>::__apply(
__alloc,
piecewise_construct,
std::forward_as_tuple(std::get<0>(std::forward<_PairLike>(__p))),
std::forward_as_tuple(std::get<1>(std::forward<_PairLike>(__p))));
}
# endif
template <class _Alloc,
class _Type,
__enable_if_t<__uses_allocator_detail::__uses_allocator_constraints<_Pair, _Type>, int> = 0>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, _Type&& __value) noexcept {
struct __pair_constructor {
using _PairMutable = remove_cv_t<_Pair>;
_LIBCPP_HIDDEN constexpr auto __do_construct(const _PairMutable& __pair) const {
return std::__make_obj_using_allocator<_PairMutable>(__alloc_, __pair);
}
_LIBCPP_HIDDEN constexpr auto __do_construct(_PairMutable&& __pair) const {
return std::__make_obj_using_allocator<_PairMutable>(__alloc_, std::move(__pair));
}
const _Alloc& __alloc_;
_Type& __value_;
_LIBCPP_HIDDEN constexpr operator _PairMutable() const { return __do_construct(std::forward<_Type>(__value_)); }
};
return std::make_tuple(__pair_constructor{__alloc, __value});
}
};
template <class _Type>
struct __uses_allocator_construction_args<_Type, __enable_if_t<!__is_cv_std_pair<_Type>>> {
template <class _Alloc, class... _Args>
static _LIBCPP_HIDE_FROM_ABI constexpr auto __apply(const _Alloc& __alloc, _Args&&... __args) noexcept {
if constexpr (!uses_allocator_v<remove_cv_t<_Type>, _Alloc> && is_constructible_v<_Type, _Args...>) {
return std::forward_as_tuple(std::forward<_Args>(__args)...);
} else if constexpr (uses_allocator_v<remove_cv_t<_Type>, _Alloc> &&
is_constructible_v<_Type, allocator_arg_t, const _Alloc&, _Args...>) {
return tuple<allocator_arg_t, const _Alloc&, _Args&&...>(allocator_arg, __alloc, std::forward<_Args>(__args)...);
} else if constexpr (uses_allocator_v<remove_cv_t<_Type>, _Alloc> &&
is_constructible_v<_Type, _Args..., const _Alloc&>) {
return std::forward_as_tuple(std::forward<_Args>(__args)..., __alloc);
} else {
static_assert(
sizeof(_Type) + 1 == 0, "If uses_allocator_v<Type> is true, the type has to be allocator-constructible");
}
}
};
template <class _Type, class _Alloc, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr _Type __make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args) {
return std::make_from_tuple<_Type>(
__uses_allocator_construction_args<_Type>::__apply(__alloc, std::forward<_Args>(__args)...));
}
template <class _Type, class _Alloc, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr _Type*
__uninitialized_construct_using_allocator(_Type* __ptr, const _Alloc& __alloc, _Args&&... __args) {
return std::apply(
[&__ptr](auto&&... __xs) { return std::__construct_at(__ptr, std::forward<decltype(__xs)>(__xs)...); },
__uses_allocator_construction_args<_Type>::__apply(__alloc, std::forward<_Args>(__args)...));
}
#endif // _LIBCPP_STD_VER >= 17
#if _LIBCPP_STD_VER >= 20
template <class _Type, class _Alloc, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr auto uses_allocator_construction_args(const _Alloc& __alloc, _Args&&... __args) noexcept
-> decltype(__uses_allocator_construction_args<_Type>::__apply(__alloc, std::forward<_Args>(__args)...)) {
return /*--*/ __uses_allocator_construction_args<_Type>::__apply(__alloc, std::forward<_Args>(__args)...);
}
template <class _Type, class _Alloc, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr auto make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args)
-> decltype(std::__make_obj_using_allocator<_Type>(__alloc, std::forward<_Args>(__args)...)) {
return /*--*/ std::__make_obj_using_allocator<_Type>(__alloc, std::forward<_Args>(__args)...);
}
template <class _Type, class _Alloc, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr auto
uninitialized_construct_using_allocator(_Type* __ptr, const _Alloc& __alloc, _Args&&... __args)
-> decltype(std::__uninitialized_construct_using_allocator(__ptr, __alloc, std::forward<_Args>(__args)...)) {
return /*--*/ std::__uninitialized_construct_using_allocator(__ptr, __alloc, std::forward<_Args>(__args)...);
}
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H