Re: [Haskell-beginners] dynamic set of objects in netwire

On 11/07/2012 07:46 PM, Ertugrul Söylemez wrote:

Nathan Hüsken wrote:

...

I need (in netwire) a way to handle a dynamic set of objects. Therefor I need a way of growing and shrinking the set. Since I have little experience with Haskell and FRP, I would appreciate some input.

Shrinking is not problem, as I can just remove wires that inhibit. But how to let the set grow?

Originally the 4.0.0 release should include the manager wire, but I have long tried to come up with an interface that is generic enough to fit in as many situations as possible.

The most obvious interface is through input. However, this really only works when only the user of the manager should be able to add or remove subwires. The interface is as simple as something like this:

data MgrMsg k e m a b = Add k (Wire e m a b) | Delete k

managerBasic :: (Monad m, Monoid b, Ord k) => Wire e m (a, [MgrMsg k e m a b]) b

Mmh, how could you (form the outside) connect the output to the induvidual managed wires? Let's say I from one of the values in the output "b" I decide I want to delete the corresponding wire? I need to know the key "k". OK, I could encode "k" in the output but should I then not explicitly return "k" with it? Regards, Nathan