[Haskell-cafe] Todo monad

[Jules Mazur]

Honest question -- why use this over e.g. a callback function?  
  
The point of this structure, as I understand it, would be to establish the
status of asynchronous computations being performed from `[a]`; it follows
that this status would be used to execute a follow-up computation.

  

Jules

  
On Aug 16 2016, at 2:27 pm, Francesco Ariis <fa-ml at ariis.it> wrote:  

> On Tue, Aug 16, 2016 at 08:21:31PM +0200, Corentin Dupont wrote:  
> Hi guys,  
> is there some library with a Monad (+Applicative, Functor...) instance of  
> the following type:  
>  
> data Todo a b = Todo [a] | Done b

>

> What is the general idea behind the "todo monad"? As an unrepented  
procrastinator, I might learn something useful.  
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