Function svn_fs_compare_ids 

pub unsafe extern "C" fn svn_fs_compare_ids(
    a: *const svn_fs_id_t,
    b: *const svn_fs_id_t,
) -> c_int

Return -1, 0, or 1 if node revisions @a a and @a b are respectively unrelated, equivalent, or otherwise related (part of the same node).

@note Consider using the more expressive #svn_fs_node_relation() instead.

@see #svn_fs_node_relation