368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H
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#define _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H
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#include <__config>
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#include <__memory/uses_allocator.h>
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#include <__utility/forward.h>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { explicit allocator_arg_t() = default; };
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#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
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extern _LIBCPP_EXPORTED_FROM_ABI const allocator_arg_t allocator_arg;
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#else
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/* inline */ constexpr allocator_arg_t allocator_arg = allocator_arg_t();
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#endif
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#ifndef _LIBCPP_CXX03_LANG
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// allocator construction
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template <class _Tp, class _Alloc, class ..._Args>
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struct __uses_alloc_ctor_imp
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{
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typedef _LIBCPP_NODEBUG __uncvref_t<_Alloc> _RawAlloc;
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static const bool __ua = uses_allocator<_Tp, _RawAlloc>::value;
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static const bool __ic =
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is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
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static const int value = __ua ? 2 - __ic : 0;
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};
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template <class _Tp, class _Alloc, class ..._Args>
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struct __uses_alloc_ctor
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: integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value>
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{};
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template <class _Tp, class _Allocator, class... _Args>
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inline _LIBCPP_INLINE_VISIBILITY
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void __user_alloc_construct_impl (integral_constant<int, 0>, _Tp *__storage, const _Allocator &, _Args &&... __args )
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{
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new (__storage) _Tp (_VSTD::forward<_Args>(__args)...);
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}
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// FIXME: This should have a version which takes a non-const alloc.
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template <class _Tp, class _Allocator, class... _Args>
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inline _LIBCPP_INLINE_VISIBILITY
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void __user_alloc_construct_impl (integral_constant<int, 1>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
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{
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new (__storage) _Tp (allocator_arg, __a, _VSTD::forward<_Args>(__args)...);
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}
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// FIXME: This should have a version which takes a non-const alloc.
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template <class _Tp, class _Allocator, class... _Args>
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inline _LIBCPP_INLINE_VISIBILITY
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void __user_alloc_construct_impl (integral_constant<int, 2>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
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{
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new (__storage) _Tp (_VSTD::forward<_Args>(__args)..., __a);
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}
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#endif // _LIBCPP_CXX03_LANG
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H
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