type SpaceFiller = fn(_: &mut Vec<File>, _: &mut VecDeque<DiskUsage>, _: Space, _: File);Expand description
This represents the difference between the parts.
&mut Vec<File>: the output file list
&mut VecDeque<DiskUsage>: the unprocessed entries in the disk usage map
Space: The leftmost space to fill
File: The file to be moved into a space