[plt-scheme] When would you use units rather than classes?

From: Grant Rettke (grettke at acm.org)
Date: Fri Apr 4 23:30:44 EDT 2008

On Fri, Apr 4, 2008 at 10:29 PM, Grant Rettke <grettke at acm.org> wrote:
>  From what I can gather, a module defines its dependencies, and how
>  they are fulfilled, only once. Every time that modules is utilized,
>  its internal bindings are the same.
>  Units define their dependencies, but not how they are fulfilled. Every
>  time you utilize a unit, you must satisfy its requirements.

By the way, "from what I can gather" means that I am trying to figure
it out myself :)

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