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 > 17
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 // [coroutine.trivial.awaitables]
24 struct suspend_never {
25     _LIBCPP_HIDE_FROM_ABI
await_readysuspend_never26     constexpr bool await_ready() const noexcept { return true; }
27     _LIBCPP_HIDE_FROM_ABI
await_suspendsuspend_never28     constexpr void await_suspend(coroutine_handle<>) const noexcept {}
29     _LIBCPP_HIDE_FROM_ABI
await_resumesuspend_never30     constexpr void await_resume() const noexcept {}
31 };
32 
33 struct suspend_always {
34     _LIBCPP_HIDE_FROM_ABI
await_readysuspend_always35     constexpr bool await_ready() const noexcept { return false; }
36     _LIBCPP_HIDE_FROM_ABI
await_suspendsuspend_always37     constexpr void await_suspend(coroutine_handle<>) const noexcept {}
38     _LIBCPP_HIDE_FROM_ABI
await_resumesuspend_always39     constexpr void await_resume() const noexcept {}
40 };
41 
42 _LIBCPP_END_NAMESPACE_STD
43 
44 #endif // __LIBCPP_STD_VER > 17
45 
46 #endif // __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H
47