In order to be used as a graph node type, a class needs to inherit certain abstract types and implement the corresponding interfaces. graph_node is the base class for any other node type; its interfaces always have to be implemented. If a node sends messages to other nodes, it has to implement the sender interface, while with receiver interface the node may accept messages. For nodes that have multiple inputs and/or outputs, each input port is a receiver and each output port is a sender.

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