mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-30 17:14:22 +03:00
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
|
|
* Copyright 2016 Facebook, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <folly/detail/CacheLocality.h>
|
|
|
|
namespace folly {
|
|
|
|
template <typename T>
|
|
class CachelinePadded;
|
|
|
|
namespace detail {
|
|
|
|
template <
|
|
typename T,
|
|
bool needsPadding = (sizeof(T) % CacheLocality::kFalseSharingRange != 0)>
|
|
struct CachelinePaddedImpl;
|
|
|
|
// We need alignas(T) alignas(kFalseSharingRange) for the case where alignof(T)
|
|
// > alignof(kFalseSharingRange).
|
|
template <typename T>
|
|
struct alignas(T) alignas(detail::CacheLocality::kFalseSharingRange)
|
|
CachelinePaddedImpl<T, /* needsPadding = */ false> {
|
|
template <typename... Args>
|
|
explicit CachelinePaddedImpl(Args&&... args)
|
|
: item(std::forward<Args>(args)...) {}
|
|
T item;
|
|
};
|
|
|
|
template <typename T>
|
|
struct alignas(T) alignas(detail::CacheLocality::kFalseSharingRange)
|
|
CachelinePaddedImpl<T, /* needsPadding = */ true> {
|
|
template <typename... Args>
|
|
explicit CachelinePaddedImpl(Args&&... args)
|
|
: item(std::forward<Args>(args)...) {}
|
|
|
|
T item;
|
|
char padding
|
|
[CacheLocality::kFalseSharingRange -
|
|
sizeof(T) % CacheLocality::kFalseSharingRange];
|
|
};
|
|
} // namespace detail
|
|
} // namespace folly
|