Provide a dummy readcdr function if needed #160
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Current master has a custom reader history cache (RHC) for monitoring the changes to the node graph without having to waste memory on it. eclipse-cyclonedds/cyclonedds#499 at long last adds a companion
dds_readcdr
to the existingdds_takecdr
that this RMW layer has depended on for a long time, and so the custom RHC needs to updated with a trivial implementation.#145 changes the mapping of ROS nodes to participants and uses the "graph cache" implemented in
rmw_dds_common
. In that setting, there is no use for this custom RHC and so this PR doesn't apply after #145 has been merged.