mirror of
https://github.com/jart/cosmopolitan.git
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120 lines
3.9 KiB
C++
120 lines
3.9 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_EXPERIMENTAL___MEMORY
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#define _LIBCPP_EXPERIMENTAL___MEMORY
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#include <__memory/allocator_arg_t.h>
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#include <__memory/uses_allocator.h>
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#include <__type_traits/conditional.h>
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#include <__type_traits/is_constructible.h>
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#include <__type_traits/is_convertible.h>
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#include <__type_traits/is_same.h>
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#include <experimental/__config>
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#include <experimental/utility> // for erased_type
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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_LFTS
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template <
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class _Tp, class _Alloc
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, bool = uses_allocator<_Tp, _Alloc>::value
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, bool = __has_allocator_type<_Tp>::value
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>
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struct __lfts_uses_allocator : public false_type {};
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template <class _Tp, class _Alloc>
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struct __lfts_uses_allocator<_Tp, _Alloc, false, false> : public false_type {};
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template <class _Tp, class _Alloc, bool HasAlloc>
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struct __lfts_uses_allocator<_Tp, _Alloc, true, HasAlloc> : public true_type {};
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template <class _Tp, class _Alloc>
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struct __lfts_uses_allocator<_Tp, _Alloc, false, true>
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: public integral_constant<bool
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, is_convertible<_Alloc, typename _Tp::allocator_type>::value
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|| is_same<erased_type, typename _Tp::allocator_type>::value
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>
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{};
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template <bool _UsesAlloc, class _Tp, class _Alloc, class ..._Args>
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struct __lfts_uses_alloc_ctor_imp
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{
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static const int value = 0;
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};
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template <class _Tp, class _Alloc, class ..._Args>
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struct __lfts_uses_alloc_ctor_imp<true, _Tp, _Alloc, _Args...>
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{
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static const bool __ic_first
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= is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
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static const bool __ic_second =
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__conditional_t<
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__ic_first,
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false_type,
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is_constructible<_Tp, _Args..., _Alloc>
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>::value;
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static_assert(__ic_first || __ic_second,
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"Request for uses allocator construction is ill-formed");
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static const int value = __ic_first ? 1 : 2;
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};
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template <class _Tp, class _Alloc, class ..._Args>
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struct __lfts_uses_alloc_ctor
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: integral_constant<int,
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__lfts_uses_alloc_ctor_imp<
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__lfts_uses_allocator<_Tp, _Alloc>::value
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, _Tp, _Alloc, _Args...
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>::value
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>
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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_t(), __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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template <class _Tp, class _Alloc, class ..._Args>
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inline _LIBCPP_INLINE_VISIBILITY
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void __lfts_user_alloc_construct(
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_Tp * __store, const _Alloc & __a, _Args &&... __args)
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{
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::std::experimental::fundamentals_v1::__user_alloc_construct_impl(
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typename __lfts_uses_alloc_ctor<_Tp, _Alloc, _Args...>::type()
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, __store, __a, _VSTD::forward<_Args>(__args)...
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);
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}
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_LIBCPP_END_NAMESPACE_LFTS
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#endif /* _LIBCPP_EXPERIMENTAL___MEMORY */
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