Re: [Haskell-beginners] Count how often a menu has been selected

Bernhard Lehnert wrote:

Hi list,

using gtk2hs I would like to count how often a Menu has been selected (well, not really, but it kind of breaks down to this):

let a = 0 onActivateLeaf menuAddOne $ do let a = a+1 print a

This leads to a stack overflow. Obviously a=a+1 is iterated over and over again. But how can I add something each time the menu is activated? (Actually I want to open a FileDialog and add the contents of a file to a list but for now, counting would be great).

Thanks to everyone for reading, Bernhard

I would suggest having a look at Control.Concurrent.MVar http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Concurren... Best, Thomas