v1/__coroutine/trivial_awaitables.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H
0010 #define __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H
0011
0012 #include <__config>
0013 #include <__coroutine/coroutine_handle.h>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 #if _LIBCPP_STD_VER >= 20
0020
0021 _LIBCPP_BEGIN_NAMESPACE_STD
0022
0023 // [coroutine.trivial.awaitables]
0024 struct suspend_never {
0025   _LIBCPP_HIDE_FROM_ABI constexpr bool await_ready() const noexcept { return true; }
0026   _LIBCPP_HIDE_FROM_ABI constexpr void await_suspend(coroutine_handle<>) const noexcept {}
0027   _LIBCPP_HIDE_FROM_ABI constexpr void await_resume() const noexcept {}
0028 };
0029
0030 struct suspend_always {
0031   _LIBCPP_HIDE_FROM_ABI constexpr bool await_ready() const noexcept { return false; }
0032   _LIBCPP_HIDE_FROM_ABI constexpr void await_suspend(coroutine_handle<>) const noexcept {}
0033   _LIBCPP_HIDE_FROM_ABI constexpr void await_resume() const noexcept {}
0034 };
0035
0036 _LIBCPP_END_NAMESPACE_STD
0037
0038 #endif // __LIBCPP_STD_VER >= 20
0039
0040 #endif // __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H