Re: [Caml-list] Parameterizing a function with a thread monad

[Philippe Veber <philippe.veber@gmail.com>]

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Hi Gabriel,

well thanks, I had forgotten this interesting approach by Daniel. Indeed
for now I'd like to try a functor/first-class module -based solution.
Thanks for the suggestion anyway!
Cheers,
  ph.

2012/10/23 Gabriel Scherer <gabriel.scherer@gmail.com>

> If you want to parametrize over arbitrary monads, the modularized
> appraoch (using functors or first-class modules) is adapted. But note
> that for more specialized needs different interfaces are possible. For
> example, Daniel Bünzli experimented with explicit inversion of control
> instead of parametrization by monadic library, to solve the problem of
> being Lwt/Async/"event loop" agnostic:
>
>   [Caml-list] Non-blocking IO interface design
>   https://sympa.inria.fr/sympa/arc/caml-list/2012-04/msg00055.html
>
> I'm not sure how this worked out in the end, but this may be worth
> looking at if you're still at the general design step.
>
> On Tue, Oct 23, 2012 at 1:52 AM, Jeremy Yallop <yallop@gmail.com> wrote:
> > On 22 October 2012 23:09, Philippe Veber <philippe.veber@gmail.com>
> wrote:
> >> A couple of libraries, like pgocaml for instance, define a functor over
> a
> >> (monadic) thread implementation, like in the following:
> >>
> >> module type Thread = sig
> >>   type 'a t
> >>   val return : 'a -> 'a t
> >>   val bind : 'a t -> ('a -> 'b t) -> 'b t
> >> end
> >>
> >> module F(T : Thread) : sig
> >>   val v : string -> string T.t
> >> end
> >>
> >> Is it possible to define F as a function (ie at the value level)?
> >
> > Yes!  Matías Giovannini has a blog post showing how to do just that:
> >
> > http://alaska-kamtchatka.blogspot.co.uk/2011/09/higher-order-fun.html
> >
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