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 {
await_readysuspend_never25   _LIBCPP_HIDE_FROM_ABI constexpr bool await_ready() const noexcept { return true; }
await_suspendsuspend_never26   _LIBCPP_HIDE_FROM_ABI constexpr void await_suspend(coroutine_handle<>) const noexcept {}
await_resumesuspend_never27   _LIBCPP_HIDE_FROM_ABI constexpr void await_resume() const noexcept {}
28 };
29 
30 struct suspend_always {
await_readysuspend_always31   _LIBCPP_HIDE_FROM_ABI constexpr bool await_ready() const noexcept { return false; }
await_suspendsuspend_always32   _LIBCPP_HIDE_FROM_ABI constexpr void await_suspend(coroutine_handle<>) const noexcept {}
await_resumesuspend_always33   _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