I need to implement a generic priority queue (basically a simple wrapper around BinaryHeap) which sorts elements by time. So I made HasTime trait which the queue elements need to implement. The problem is that I would like to avoid implementing Ord trait as well for each type because it is always the same for all types which implement HasTime. According to discussion here  it seems that we can't define default cmp implementation for all types which implement HasTime. So, is there some better approach then writing a macro which implements Ord trait for all HasTime types?
Thanks in advance,