[swift-evolution] Epic: Typesafe calculations

[David Waite]

> On Jan 21, 2016, at 1:22 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Yes, struct subtyping has come up several times.  There are several
> things I'd like to do with it in the standard library.
> 
What do people mean when they say struct subclassing? Code reuse, polymorphism, or something else?

-DW

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