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https://github.com/kidfromjupiter/nearby.git
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52 lines
1.6 KiB
C++
52 lines
1.6 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_BASE_CANCELLATION_FLAG_H_
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#define PLATFORM_BASE_CANCELLATION_FLAG_H_
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#include <memory>
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#include "absl/synchronization/mutex.h"
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namespace location {
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namespace nearby {
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// A cancellation flag to mark an operation has been cancelled and should be
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// cleaned up as soon as possible.
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class CancellationFlag {
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public:
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CancellationFlag();
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explicit CancellationFlag(bool cancelled);
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CancellationFlag(const CancellationFlag &) = delete;
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CancellationFlag &operator=(const CancellationFlag &) = delete;
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CancellationFlag(CancellationFlag &&) = default;
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CancellationFlag &operator=(CancellationFlag &&) = default;
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virtual ~CancellationFlag() = default;
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// Set the flag as cancelled.
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void Cancel() ABSL_LOCKS_EXCLUDED(mutex_);
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// Returns true if the flag has been set to cancelled.
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bool Cancelled() const ABSL_LOCKS_EXCLUDED(mutex_);
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private:
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std::unique_ptr<absl::Mutex> mutex_;
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bool cancelled_ ABSL_GUARDED_BY(mutex_) = false;
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};
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} // namespace nearby
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} // namespace location
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#endif // PLATFORM_BASE_CANCELLATION_FLAG_H_
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