5d4439cc3e
release/17.x branch, commit 8f4dd44097c9ae25dd203d5ac87f3b48f854bba8 This adds the flag `-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL`. A future enhancement could possibly pass something different if there is a compelling parallel implementation. That libdispatch one might be worth looking into.
60 lines
1.6 KiB
C++
Vendored
60 lines
1.6 KiB
C++
Vendored
// -*- 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___MEMORY_USES_ALLOCATOR_H
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#define _LIBCPP___MEMORY_USES_ALLOCATOR_H
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#include <__config>
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#include <__type_traits/is_convertible.h>
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#include <cstddef>
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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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template <class _Tp>
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struct __has_allocator_type
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{
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private:
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template <class _Up> static false_type __test(...);
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template <class _Up> static true_type __test(typename _Up::allocator_type* = 0);
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public:
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static const bool value = decltype(__test<_Tp>(0))::value;
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};
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template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
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struct __uses_allocator
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: public integral_constant<bool,
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is_convertible<_Alloc, typename _Tp::allocator_type>::value>
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{
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};
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template <class _Tp, class _Alloc>
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struct __uses_allocator<_Tp, _Alloc, false>
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: public false_type
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{
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};
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template <class _Tp, class _Alloc>
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struct _LIBCPP_TEMPLATE_VIS uses_allocator
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: public __uses_allocator<_Tp, _Alloc>
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{
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};
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#if _LIBCPP_STD_VER >= 17
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template <class _Tp, class _Alloc>
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inline constexpr bool uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_USES_ALLOCATOR_H
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