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llvm-project/libcxx/include/__coroutine/trivial_awaitables.h

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[libcxx] [Coroutine] Conform Coroutine Implementation Since coroutine is merged in C++ standard and the support for coroutine seems relatively stable. It's the time to move the implementation of coroutine out of the experimental directory and the std::experimental namespace. This patch creates header <coroutine> with conformed implementation with C++ standard. To avoid breaking user's code too fast, the <experimental/coroutine> header is remained. Note that <experimental/coroutine> is deprecated and it would be removed in LLVM15. Reviewed By: Quuxplusone, ldionne Differential Revision: https://reviews.llvm.org/D109433
2021-11-16 14:05:34 +08:00
//===----------------------------------------------------------------------===//
//
// 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___COROUTINE_TRIVIAL_AWAITABLES_H
#define __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H
#include <__config>
#include <__coroutine/coroutine_handle.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
[libc++] Normalize all our '#pragma GCC system_header', and regression-test. Now we'll notice if a header forgets to include this magic phrase. Differential Revision: https://reviews.llvm.org/D118800
2022-02-02 09:16:40 +08:00
# pragma GCC system_header
[libcxx] [Coroutine] Conform Coroutine Implementation Since coroutine is merged in C++ standard and the support for coroutine seems relatively stable. It's the time to move the implementation of coroutine out of the experimental directory and the std::experimental namespace. This patch creates header <coroutine> with conformed implementation with C++ standard. To avoid breaking user's code too fast, the <experimental/coroutine> header is remained. Note that <experimental/coroutine> is deprecated and it would be removed in LLVM15. Reviewed By: Quuxplusone, ldionne Differential Revision: https://reviews.llvm.org/D109433
2021-11-16 14:05:34 +08:00
#endif
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CXX20_COROUTINES)
_LIBCPP_BEGIN_NAMESPACE_STD
// [coroutine.trivial.awaitables]
struct suspend_never {
_LIBCPP_HIDE_FROM_ABI
constexpr bool await_ready() const noexcept { return true; }
_LIBCPP_HIDE_FROM_ABI
constexpr void await_suspend(coroutine_handle<>) const noexcept {}
_LIBCPP_HIDE_FROM_ABI
constexpr void await_resume() const noexcept {}
};
struct suspend_always {
_LIBCPP_HIDE_FROM_ABI
constexpr bool await_ready() const noexcept { return false; }
_LIBCPP_HIDE_FROM_ABI
constexpr void await_suspend(coroutine_handle<>) const noexcept {}
_LIBCPP_HIDE_FROM_ABI
constexpr void await_resume() const noexcept {}
};
_LIBCPP_END_NAMESPACE_STD
#endif // __LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CXX20_COROUTINES)
#endif // __LIBCPP___COROUTINE_TRIVIAL_AWAITABLES_H