I think that adding a derive macro similar to CopyGetters but for Clone would be useful when working with reference counters.

Consider the struct:

struct Foo {
    bar: Arc<u32>
}

I often find myself writing getters like this:

fn bar(&self) -> Arc<u32> {
    Arc::clone(&self.bar)
}

that return owned Arcs. However, this is not currently possible (it think) in getset. You can't use CopyGetters since Arc isn't Copy and you can't use Getters since it would return a &Arc<...>.

I think it can be left up to the user to decide whether cloning the type is "cheap", so it shouldn't be restricted to reference counters although I see this as the main use case.