Re: [Haskell-cafe] Is it usual to read a Maybe (IORef a) ?

2008/9/3 Lennart Augustsson :

I think you should think about why your application needs IORef at all. Do you really need mutation? And why isn't STRef good enough. Using IORef is really the last resort.

This is for an interactive application (3D mesh editing, the data structure is the half edge structure). So the user can add points, edges, faces, delete them, ... Thu