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8e2d09c339
This allows backends to customize arbitrary parallel algorithms, which was requested pretty often. Reviewed By: #libc, ldionne Spies: arichardson, miyuki, crtrott, dalg24, __simt__, philnik, libcxx-commits Differential Revision: https://reviews.llvm.org/D149686
46 lines
1.8 KiB
C++
46 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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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___ALGORITHM_PSTL_FRONTEND_DISPATCH
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#define _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH
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#include <__config>
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#include <__type_traits/is_callable.h>
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#include <__utility/forward.h>
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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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#if _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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# define _LIBCPP_PSTL_CUSTOMIZATION_POINT(name) \
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[](auto&&... __args) -> decltype(std::name<_RawPolicy>(typename __select_backend<_RawPolicy>::type{}, \
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std::forward<decltype(__args)>(__args)...)) { \
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return std::name<_RawPolicy>( \
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typename __select_backend<_RawPolicy>::type{}, std::forward<decltype(__args)>(__args)...); \
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}
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template <class _SpecializedImpl, class _GenericImpl, class... _Args>
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_LIBCPP_HIDE_FROM_ABI decltype(auto)
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__pstl_frontend_dispatch(_SpecializedImpl __specialized_impl, _GenericImpl __generic_impl, _Args&&... __args) {
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if constexpr (__is_callable<_SpecializedImpl, _Args...>::value) {
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return __specialized_impl(std::forward<_Args>(__args)...);
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} else {
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return __generic_impl(std::forward<_Args>(__args)...);
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}
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 17
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#endif // _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH
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