1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H 10 #define __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H 11 12 #include <__config> 13 #include <__coroutine/coroutine_handle.h> 14 15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16 # pragma GCC system_header 17 #endif 18 19 #if _LIBCPP_STD_VER >= 20 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 // [coroutine.trivial.awaitables] 24 struct suspend_never { 25 _LIBCPP_HIDE_FROM_ABI constexpr bool await_ready() const noexcept { return true; } 26 _LIBCPP_HIDE_FROM_ABI constexpr void await_suspend(coroutine_handle<>) const noexcept {} 27 _LIBCPP_HIDE_FROM_ABI constexpr void await_resume() const noexcept {} 28 }; 29 30 struct suspend_always { 31 _LIBCPP_HIDE_FROM_ABI constexpr bool await_ready() const noexcept { return false; } 32 _LIBCPP_HIDE_FROM_ABI constexpr void await_suspend(coroutine_handle<>) const noexcept {} 33 _LIBCPP_HIDE_FROM_ABI constexpr void await_resume() const noexcept {} 34 }; 35 36 _LIBCPP_END_NAMESPACE_STD 37 38 #endif // __LIBCPP_STD_VER >= 20 39 40 #endif // __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H 41