diff options
Diffstat (limited to 'libcxx/include/__algorithm/pstl_frontend_dispatch.h')
| -rw-r--r-- | libcxx/include/__algorithm/pstl_frontend_dispatch.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/libcxx/include/__algorithm/pstl_frontend_dispatch.h b/libcxx/include/__algorithm/pstl_frontend_dispatch.h new file mode 100644 index 000000000000..dc49f3e5163a --- /dev/null +++ b/libcxx/include/__algorithm/pstl_frontend_dispatch.h @@ -0,0 +1,45 @@ +//===----------------------------------------------------------------------===// +// +// 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) \ + [](auto&&... __args) -> decltype(std::name<_RawPolicy>(typename __select_backend<_RawPolicy>::type{}, \ + std::forward<decltype(__args)>(__args)...)) { \ + return std::name<_RawPolicy>( \ + typename __select_backend<_RawPolicy>::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 |