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Diffstat (limited to 'libcxx/include/__memory/uses_allocator_construction.h')
| -rw-r--r-- | libcxx/include/__memory/uses_allocator_construction.h | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/libcxx/include/__memory/uses_allocator_construction.h b/libcxx/include/__memory/uses_allocator_construction.h new file mode 100644 index 000000000000..0f63b080daf3 --- /dev/null +++ b/libcxx/include/__memory/uses_allocator_construction.h @@ -0,0 +1,221 @@ +//===----------------------------------------------------------------------===// +// +// 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 <__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_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 _Type, class _Alloc, class... _Args, __enable_if_t<!__is_std_pair<_Type>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, _Args&&... __args) noexcept { + if constexpr (!uses_allocator_v<_Type, _Alloc> && is_constructible_v<_Type, _Args...>) { + return std::forward_as_tuple(std::forward<_Args>(__args)...); + } else if constexpr (uses_allocator_v<_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<_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 _Pair, class _Alloc, class _Tuple1, class _Tuple2, __enable_if_t<__is_std_pair<_Pair>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto __uses_allocator_construction_args( + const _Alloc& __alloc, piecewise_construct_t, _Tuple1&& __x, _Tuple2&& __y) noexcept { + return std::make_tuple( + piecewise_construct, + std::apply( + [&__alloc](auto&&... __args1) { + return std::__uses_allocator_construction_args<typename _Pair::first_type>( + __alloc, std::forward<decltype(__args1)>(__args1)...); + }, + std::forward<_Tuple1>(__x)), + std::apply( + [&__alloc](auto&&... __args2) { + return std::__uses_allocator_construction_args<typename _Pair::second_type>( + __alloc, std::forward<decltype(__args2)>(__args2)...); + }, + std::forward<_Tuple2>(__y))); +} + +template <class _Pair, class _Alloc, __enable_if_t<__is_std_pair<_Pair>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto __uses_allocator_construction_args(const _Alloc& __alloc) noexcept { + return std::__uses_allocator_construction_args<_Pair>(__alloc, piecewise_construct, tuple<>{}, tuple<>{}); +} + +template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, _Up&& __u, _Vp&& __v) noexcept { + return std::__uses_allocator_construction_args<_Pair>( + __alloc, + piecewise_construct, + std::forward_as_tuple(std::forward<_Up>(__u)), + std::forward_as_tuple(std::forward<_Vp>(__v))); +} + +# if _LIBCPP_STD_VER > 20 +template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, pair<_Up, _Vp>& __pair) noexcept { + return std::__uses_allocator_construction_args<_Pair>( + __alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second)); +} +# endif + +template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, const pair<_Up, _Vp>& __pair) noexcept { + return std::__uses_allocator_construction_args<_Pair>( + __alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second)); +} + +template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, pair<_Up, _Vp>&& __pair) noexcept { + return std::__uses_allocator_construction_args<_Pair>( + __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 > 20 +template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, const pair<_Up, _Vp>&& __pair) noexcept { + return std::__uses_allocator_construction_args<_Pair>( + __alloc, + piecewise_construct, + std::forward_as_tuple(std::get<0>(std::move(__pair))), + std::forward_as_tuple(std::get<1>(std::move(__pair)))); +} +# endif + +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; + +} // namespace __uses_allocator_detail + +template < + class _Pair, + class _Alloc, + class _Type, + __enable_if_t<__is_std_pair<_Pair> && !__uses_allocator_detail::__convertible_to_const_pair_ref<_Type>, int> = 0> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, _Type&& __value) noexcept; + +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, + class _Alloc, + class _Type, + __enable_if_t<__is_std_pair<_Pair> && !__uses_allocator_detail::__convertible_to_const_pair_ref<_Type>, int>> +_LIBCPP_HIDE_FROM_ABI constexpr auto +__uses_allocator_construction_args(const _Alloc& __alloc, _Type&& __value) noexcept { + struct __pair_constructor { + using _PairMutable = remove_cv_t<_Pair>; + + _LIBCPP_HIDE_FROM_ABI constexpr auto __do_construct(const _PairMutable& __pair) const { + return std::__make_obj_using_allocator<_PairMutable>(__alloc_, __pair); + } + + _LIBCPP_HIDE_FROM_ABI constexpr auto __do_construct(_PairMutable&& __pair) const { + return std::__make_obj_using_allocator<_PairMutable>(__alloc_, std::move(__pair)); + } + + const _Alloc& __alloc_; + _Type& __value_; + + _LIBCPP_HIDE_FROM_ABI constexpr operator _PairMutable() const { + return __do_construct(std::forward<_Type>(this->__value_)); + } + }; + + return std::make_tuple(__pair_constructor{__alloc, __value}); +} + +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>( + std::__uses_allocator_construction_args<_Type>(__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)...); }, + std::__uses_allocator_construction_args<_Type>(__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(std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...)) { + return /*--*/ std::__uses_allocator_construction_args<_Type>(__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 + +#endif // _LIBCPP___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H |