ros2run help parameters

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Hi,

I was checking the ros2 run examples to launch a node. like mentioned here https://github.com/ros2/ros2/wiki/Nod...

How does the node, which is being launched with the above command use the parameters? i.e accessing the loaded parameters for the first time without registering the on_event_callback.

For ex: I've

ros2 run demo_nodes_cpp talker __params:=test.yaml

How do I access the parameters from test.yaml within talker node? (This is just an example I'm quoting not the use case though).

Thanks Sriram