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[libc++] Implement C++20 atomic_ref (llvm#76647)
Implement the std::atomic_ref class template by reusing atomic_base_impl. Based on the work from https://reviews.llvm.org/D72240
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//===----------------------------------------------------------------------===// | ||
// | ||
// 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#ifndef _LIBCPP___ATOMIC_TO_GCC_ORDER_H | ||
#define _LIBCPP___ATOMIC_TO_GCC_ORDER_H | ||
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#include <__atomic/memory_order.h> | ||
#include <__config> | ||
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | ||
# pragma GCC system_header | ||
#endif | ||
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_LIBCPP_BEGIN_NAMESPACE_STD | ||
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#if defined(__ATOMIC_RELAXED) && defined(__ATOMIC_CONSUME) && defined(__ATOMIC_ACQUIRE) && \ | ||
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) { | ||
// Avoid switch statement to make this a constexpr. | ||
return __order == memory_order_relaxed | ||
? __ATOMIC_RELAXED | ||
: (__order == memory_order_acquire | ||
? __ATOMIC_ACQUIRE | ||
: (__order == memory_order_release | ||
? __ATOMIC_RELEASE | ||
: (__order == memory_order_seq_cst | ||
? __ATOMIC_SEQ_CST | ||
: (__order == memory_order_acq_rel ? __ATOMIC_ACQ_REL : __ATOMIC_CONSUME)))); | ||
} | ||
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_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR int __to_gcc_failure_order(memory_order __order) { | ||
// Avoid switch statement to make this a constexpr. | ||
return __order == memory_order_relaxed | ||
? __ATOMIC_RELAXED | ||
: (__order == memory_order_acquire | ||
? __ATOMIC_ACQUIRE | ||
: (__order == memory_order_release | ||
? __ATOMIC_RELAXED | ||
: (__order == memory_order_seq_cst | ||
? __ATOMIC_SEQ_CST | ||
: (__order == memory_order_acq_rel ? __ATOMIC_ACQUIRE : __ATOMIC_CONSUME)))); | ||
} | ||
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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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