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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_FEED_CORE_V2_OPERATION_TOKEN_H_
#define COMPONENTS_FEED_CORE_V2_OPERATION_TOKEN_H_
#include "base/memory/weak_ptr.h"
namespace feed {
// A copyable object which Tracks whether or not an `Operation` is alive.
class OperationToken {
public:
static OperationToken MakeInvalid();
~OperationToken();
OperationToken(const OperationToken& src);
OperationToken& operator=(const OperationToken& src);
// Returns whether the operation is alive. Returns `false` if the operation
// has been destroyed.
explicit operator bool() const;
// An operation which can be tracked by `OperationToken`.
class Operation {
public:
Operation();
~Operation();
Operation(const Operation&) = delete;
Operation& operator=(const Operation&) const = delete;
// Reset the operation, and start a new one. All existing operation
// tokens will report this operation as destroyed.
void Reset();
// Return a token pointing to this operation.
OperationToken Token();
private:
base::WeakPtrFactory<Operation> weak_ptr_factory_{this};
};
private:
explicit OperationToken(base::WeakPtr<Operation> token);
base::WeakPtr<Operation> token_;
};
} // namespace feed
#endif // COMPONENTS_FEED_CORE_V2_OPERATION_TOKEN_H_
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