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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH
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10 #define _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH
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11
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12 #include <__config>
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13 #include <__type_traits/is_callable.h>
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14 #include <__utility/forward.h>
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15
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16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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17 # pragma GCC system_header
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18 #endif
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19
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20 #if _LIBCPP_STD_VER >= 17
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21
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22 _LIBCPP_BEGIN_NAMESPACE_STD
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23
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24 # define _LIBCPP_PSTL_CUSTOMIZATION_POINT(name) \
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25 [](auto&&... __args) -> decltype(std::name<_RawPolicy>(typename __select_backend<_RawPolicy>::type{}, \
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26 std::forward<decltype(__args)>(__args)...)) { \
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27 return std::name<_RawPolicy>( \
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28 typename __select_backend<_RawPolicy>::type{}, std::forward<decltype(__args)>(__args)...); \
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29 }
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30
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31 template <class _SpecializedImpl, class _GenericImpl, class... _Args>
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32 _LIBCPP_HIDE_FROM_ABI decltype(auto)
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33 __pstl_frontend_dispatch(_SpecializedImpl __specialized_impl, _GenericImpl __generic_impl, _Args&&... __args) {
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34 if constexpr (__is_callable<_SpecializedImpl, _Args...>::value) {
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35 return __specialized_impl(std::forward<_Args>(__args)...);
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36 } else {
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37 return __generic_impl(std::forward<_Args>(__args)...);
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38 }
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39 }
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40
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41 _LIBCPP_END_NAMESPACE_STD
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42
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43 #endif // _LIBCPP_STD_VER >= 17
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44
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45 #endif // _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH
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