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There are places in which we need to use the column family object many times, with deferring points in between. Because the column family may have been destroyed in the deferring point, we need to go and find it again. If we use lw_shared_ptr, however, we'll be able to at least guarantee that the object will be alive. Some users will still need to check, if they want to guarantee that the column family wasn't removed. But others that only need to make sure we don't access an invalid object will be able to avoid the cost of re-finding it just fine. Signed-off-by: Glauber Costa <glauber@scylladb.com> Message-Id: <722bf49e158da77ff509372c2034e5707706e5bf.1478111467.git.glauber@scylladb.com>