chromium/third_party/libc++/src/include/__atomic/atomic_base.h

//===----------------------------------------------------------------------===//
//
// 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___ATOMIC_ATOMIC_BASE_H
#define _LIBCPP___ATOMIC_ATOMIC_BASE_H

#include <__atomic/atomic_sync.h>
#include <__atomic/check_memory_order.h>
#include <__atomic/cxx_atomic_impl.h>
#include <__atomic/is_always_lock_free.h>
#include <__atomic/memory_order.h>
#include <__config>
#include <__memory/addressof.h>
#include <__type_traits/is_integral.h>
#include <__type_traits/is_nothrow_constructible.h>
#include <__type_traits/is_same.h>
#include <version>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp, bool = is_integral<_Tp>::value && !is_same<_Tp, bool>::value>
struct __atomic_base // false
{ … };

// atomic<Integral>

__atomic_base<_Tp, true>;

// Here we need _IsIntegral because the default template argument is not enough
// e.g  __atomic_base<int> is __atomic_base<int, true>, which inherits from
// __atomic_base<int, false> and the caller of the wait function is
// __atomic_base<int, false>. So specializing __atomic_base<_Tp> does not work
__atomic_waitable_traits<__atomic_base<_Tp, _IsIntegral>>;

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ATOMIC_ATOMIC_BASE_H