Markus Mottl wrote:

> No, you'd need an abstract module for this to hide the concrete
> representation.  This is actually good SE-practice.
> 
> You can do this very conveniently using so-called phantom types.  For the
> special case of references, here is an example that implements ones,
> which can be made constant:

Everyone's responses were helpful, and this is exactly what I was 
looking for.  Thank you.

-- 
Chris Gorski - http://www.cgorski.org

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