Excerpts from Bruce Momjian's message of mar may 10 16:21:36 -0400 2011:
> Darren Duncan wrote:
> > To follow-up, an additional feature that would be useful and resembles union
> > types is the variant where you could declare a union type first and then
> > separately other types could declare they are a member of the union. I'm
> > talking about loosely what mixins or type-roles or interfaces etc are in other
> > languages. The most trivial example would be declaring an ENUM-alike first and
> > then separately declaring the component values where the latter declare they are
> > part of the ENUM, and this could make it easier to add or change ENUM values.
> > But keep in mind that this is a distinct concept from what we're otherwise
> > talking about as being union types. -- Darren Duncan
>
> Should this be a TODO item?
The general idea of C-style unions, sure. Mixin-style stuff ... not sure.
Seems like it'd be pretty painful.
--
Álvaro Herrera <alvherre@commandprompt.com>
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