42ba740aff
Implement the std::atomic_ref class template by reusing atomic_base_impl. Based on the work from https://reviews.llvm.org/D72240
55 lines
2.1 KiB
C
55 lines
2.1 KiB
C
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ATOMIC_TO_GCC_ORDER_H
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#define _LIBCPP___ATOMIC_TO_GCC_ORDER_H
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#include <__atomic/memory_order.h>
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if defined(__ATOMIC_RELAXED) && defined(__ATOMIC_CONSUME) && defined(__ATOMIC_ACQUIRE) && \
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defined(__ATOMIC_RELEASE) && defined(__ATOMIC_ACQ_REL) && defined(__ATOMIC_SEQ_CST)
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_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_order(memory_order __order) {
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// Avoid switch statement to make this a constexpr.
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return __order == memory_order_relaxed
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? __ATOMIC_RELAXED
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: (__order == memory_order_acquire
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? __ATOMIC_ACQUIRE
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: (__order == memory_order_release
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? __ATOMIC_RELEASE
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: (__order == memory_order_seq_cst
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? __ATOMIC_SEQ_CST
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: (__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL : __ATOMIC_CONSUME))));
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}
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_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_failure_order(memory_order __order) {
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// Avoid switch statement to make this a constexpr.
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return __order == memory_order_relaxed
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? __ATOMIC_RELAXED
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: (__order == memory_order_acquire
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? __ATOMIC_ACQUIRE
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: (__order == memory_order_release
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? __ATOMIC_RELAXED
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: (__order == memory_order_seq_cst
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? __ATOMIC_SEQ_CST
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: (__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE : __ATOMIC_CONSUME))));
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}
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ATOMIC_TO_GCC_ORDER_H
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