[ros-users] questions re rospack and message_filters

Michael Styer michael at styer.net
Tue Jul 27 23:53:58 UTC 2010

Hello ROS users,

[ROS: latest C-turtle from the .deb packages on Ubuntu lucid.] 

I have a couple of questions, if you don't mind. They're related, but
only in how I came across them, so I won't bore you with the details.

First, on the wiki page for message_filters, it says the ApproximateTime
policy classes aren't released yet and are only available in trunk, but
I found the sync_policy headers in my latest updated cturtle tree from
the .deb packages. It looks like that note is out of date, but I thought
I should check before deleting it.

Second, I noticed that (I think) 'rospack find' crawls $ROS_ROOT before
any of the directories in $ROS_PACKAGE_PATH (rospack.cpp, line 1593).
Why is that? All the setup.sh files add $ROS_ROOT to $ROS_PACKAGE_PATH,
so it seems unnecessary to crawl $ROS_ROOT explicitly, and it seems to
break the search ordering implied by $ROS_PACKAGE_PATH. Or is there
something else going on that I'm missing?



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