keyed data

This second example on Keyed Data shows how the Ownership QoS interacts with the registration, unregistration, and disposal of instance of multiple DataWriters. It also illustrates how the on_data_available callback on the DataReader can delegate to ther handlers based on instance state changes, and explains filtering mechanisms to read only certain keys.
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This example illustrate how to use keyed data. In particular, in this example a single DataWriter creates three instances differentiated by the field "code", which is the field used as key.
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