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Emmanuel Prunet

register_instance vs lookup_instance

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I want to know the best usage of register_instance and lookup_instance on a datawriter for successive write of the same instance.

Should I do :


auto h1 = writer.register_instance(ddsData);



writer.write(ddsData, map.find(h1));





writer.write(ddsData, writer.lookup_instance(ddsData));



writer.write(ddsData, writer.register_instance(ddsData));



In I) I register the instance and save it in a map. Then, when I want to write the instance, I get the instance_handle in the map and use it in the write() call.

In II) I just register the instance. Then, when I want to write the instance, I retrieve the instance_handle with lookup_instance and use it in the write() call.

In III) I register the instance in the write() call.


If register_instance is idempotent, I think III) is what I want to do : registering the instance the first time then use the instance_handle for the write call.

But I don't know if instance handles are internally stored in a map or if I should do it myself like in I)


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