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< std::string portName;
---
> const std::string portName;
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> /**
> * Whether this port is currently connected to a peer port.
> */
> bool _connected;
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> /** Attach to a peer port. */
> virtual void bind(Port &peer) = 0;
>
> /** Dettach from a peer port. */
> virtual void unbind() = 0;
>
> /** Is this port currently connected to a peer? */
> bool isConnected() const { return _connected; }