[Haskell-cafe] free vs. operational vs. free-operational

Nickolay Kudasov nickolay.kudasov at gmail.com
Tue Nov 26 12:20:15 UTC 2013

Hi Oleg,

These extensible effects are great, thank you for bringing them up!

However it seems that the code is still under early development.
Could you please elaborate on the current state of the project?
Can it be considered stable?
Where should I look for the uses of extensible effects?

Thanks in advance,

2013/11/26 <oleg at okmij.org>

> Alejandro Serrano Mena wrote:
> > I really like the separation between providing a data type and then a
> > interpretation that operational embodies...
> Then perhaps you may like extensible effects then. They are designed
> around the separation of requestors and their interpreters. However, the
> set of requests is open (and can be extended at any time without
> recompiling the program). Likewise the interpreters can be extended
> incrementally. One can add an interpreter for an effect without caring
> what other effects are there -- unless one has some reason for caring
> about other effects (e.g.,m for finalization). One may then snoop on
> other effects while interpreting. Moreover, the handlers may be
> scattered around program; they don't have to be all at the very top.
> Crucially, unlike data types a la carte, extensible effects provide
> effect encapsulation: one can not only add effects but subtract them,
> by completely handling the effects. The type system ensures that all
> effects must be completely handled at the end.
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