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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 existing dds_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.

@eboasson eboasson changed the base branch from master to dashing-eloquent April 23, 2020 06:50
@eboasson eboasson changed the base branch from dashing-eloquent to master April 23, 2020 06:50
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No longer applicable now that #145 has been merged. The change would be potentially be useful for dashing/eloquent, but just retargetting the PR is not a practical approach.

Closing.

@eboasson eboasson closed this Apr 23, 2020
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