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https://github.com/kidfromjupiter/nearby.git
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59 lines
1.7 KiB
C++
59 lines
1.7 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_PUBLIC_CANCELABLE_H_
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#define PLATFORM_PUBLIC_CANCELABLE_H_
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#include <memory>
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#include <utility>
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#include "internal/platform/implementation/cancelable.h"
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#include "internal/platform/cancellable_task.h"
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namespace nearby {
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// An interface to provide a cancellation mechanism for objects that represent
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// long-running operations.
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class Cancelable final {
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public:
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Cancelable() = default;
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Cancelable(const Cancelable&) = default;
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Cancelable& operator=(const Cancelable& other) = default;
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~Cancelable() = default;
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// This constructor is used internally only,
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// by other classes in "//platform/public/".
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explicit Cancelable(std::shared_ptr<CancellableTask> task,
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std::shared_ptr<api::Cancelable> impl)
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: task_{task}, impl_(std::move(impl)) {}
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bool Cancel() {
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if (!impl_) return false;
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bool result = impl_->Cancel();
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task_->CancelAndWaitIfStarted();
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return result;
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}
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bool IsValid() { return impl_ != nullptr; }
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private:
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std::shared_ptr<CancellableTask> task_;
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std::shared_ptr<api::Cancelable> impl_;
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};
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} // namespace nearby
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#endif // PLATFORM_PUBLIC_CANCELABLE_H_
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