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https://github.com/kidfromjupiter/nearby.git
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88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef PLATFORM_V2_PUBLIC_ATOMIC_REFERENCE_H_
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#define PLATFORM_V2_PUBLIC_ATOMIC_REFERENCE_H_
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#include <memory>
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#include <type_traits>
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#include "platform_v2/api/atomic_reference.h"
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#include "platform_v2/api/platform.h"
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#include "platform_v2/public/mutex.h"
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#include "platform_v2/public/mutex_lock.h"
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namespace location {
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namespace nearby {
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// An object reference that may be updated atomically.
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template <typename, typename = void>
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class AtomicReference;
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// Platform-based atomic type, for something convertible to std::uint32_t.
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template <typename T>
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class AtomicReference<T, std::enable_if_t<sizeof(T) <= sizeof(std::uint32_t) &&
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std::is_trivially_copyable<T>::value>>
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final {
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public:
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using Platform = api::ImplementationPlatform;
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explicit AtomicReference(T value)
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: impl_(Platform::CreateAtomicUint32(static_cast<std::uint32_t>(value))) {
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}
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~AtomicReference() = default;
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AtomicReference(AtomicReference&&) = default;
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AtomicReference& operator=(AtomicReference&&) = default;
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T Get() const { return static_cast<T>(impl_->Get()); }
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void Set(T value) { impl_->Set(static_cast<std::uint32_t>(value)); }
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private:
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std::unique_ptr<api::AtomicUint32> impl_;
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};
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// Atomic type that is using Platform mutex to provide atomicity.
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// Supports any copyable type.
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template <typename T>
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class AtomicReference<T,
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std::enable_if_t<(sizeof(T) > sizeof(std::uint32_t) ||
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!std::is_trivially_copyable<T>::value)>>
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final {
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public:
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explicit AtomicReference(T value) {
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MutexLock lock(&mutex_);
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value_ = std::move(value);
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}
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void Set(T value) {
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MutexLock lock(&mutex_);
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value_ = std::move(value);
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}
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T Get() const& {
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MutexLock lock(&mutex_);
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return value_;
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}
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T&& Get() const&& {
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MutexLock lock(&mutex_);
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return std::move(value_);
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}
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private:
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mutable Mutex mutex_;
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T value_;
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};
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} // namespace nearby
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} // namespace location
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#endif // PLATFORM_V2_PUBLIC_ATOMIC_REFERENCE_H_
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