Also, Core_kernel's Sequence type fills a similar purpose.  And Flambda
does a good job of optimizing the iteration in Sequence, from what I've
overheard about our experiments.

On Thu, Apr 21, 2016 at 5:32 AM, Jonas Jensen <jj@issuu.com> wrote:

> On 21 April 2016 at 09:13, Gregory Malecha <gmalecha@gmail.com> wrote:
> >
> > I'm wondering if there is any work (and interest) on supporting
> user-defined optimizations similar to GHC's rewrite rules in the Ocaml
> compiler. For example, a standard example would be specifying map fusion:
> >
> > map f (map g ls) = map (fun x -> f (g x)) ls
>
> A "boring" and practical answer is that you get this optimization by
> writing your long chain of map, filter, bind, etc. using Batteries'
> Enum (
> http://ocaml-batteries-team.github.io/batteries-included/hdoc2/BatEnum.html
> )
> or the stand-alone Gen package
> (http://cedeela.fr/~simon/software/gen/Gen.S.html). It looks
> superficially like list map, but the order of execution will be like
> after a fusion, which should improve cache locality and avoid
> allocations of intermediate lists.
>
> Cheers,
> Jonas
>
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