| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH |
| #define _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH |
| |
| #include <__config> |
| #include <__type_traits/is_callable.h> |
| #include <__utility/forward.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if _LIBCPP_STD_VER >= 17 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| # define _LIBCPP_PSTL_CUSTOMIZATION_POINT(name, policy) \ |
| [](auto&&... __args) -> decltype(std::name<policy>( \ |
| typename __select_backend<policy>::type{}, std::forward<decltype(__args)>(__args)...)) { \ |
| return std::name<policy>(typename __select_backend<policy>::type{}, std::forward<decltype(__args)>(__args)...); \ |
| } |
| |
| template <class _SpecializedImpl, class _GenericImpl, class... _Args> |
| _LIBCPP_HIDE_FROM_ABI decltype(auto) |
| __pstl_frontend_dispatch(_SpecializedImpl __specialized_impl, _GenericImpl __generic_impl, _Args&&... __args) { |
| if constexpr (__is_callable<_SpecializedImpl, _Args...>::value) { |
| return __specialized_impl(std::forward<_Args>(__args)...); |
| } else { |
| return __generic_impl(std::forward<_Args>(__args)...); |
| } |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER >= 17 |
| |
| #endif // _LIBCPP___ALGORITHM_PSTL_FRONTEND_DISPATCH |
