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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
2.7 KiB
C++
90 lines
2.7 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 <experimental/__config>
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#include <experimental/utility> // for erased_type
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#include <__functional_base>
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#include <type_traits>
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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<
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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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>::type::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 _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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_VSTD::__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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