>
>
> For integers, we really can do something similar in one line with:
> enum class qty_t : int64_t {};
>
That's a good positive example. Sadly not so sanguine for *double* or
*complex*.


> While we are technically out of luck for other types, a wrapping aggregate
> struct isn’t that horrible (though potentially with an attribute that hints
> it wants the abi of the wrapped field).
>
I'm not so skilled. I find it a wee bit horrible especially w.r.t.
constructors.

Still, cloning, and possibly cloning with extensions, seems a useful thing.
Perhaps too useful though ;-)

--Matt.