The first thing I would do i is verify that the compiler is not already doing this.
On Sun, Sep 6, 2009 at 7:50 AM, Peter Verswyvelen<[email protected]> wrote: > I've seen a couple of package being announced that provide first class > labels, and other packages already existed for this (Grapefruit > Record, HList, Accessor, ...) > > Regarding this, I have a question about the performance of multiple > composed field updates. Maybe an example. > > Suppose I have a large record - say WindowDescription - which contains > a lot of fields. > > Suppose I have a couple of default window description values, e.g. > defaultWindowDesc, dialogBoxDesc, etc > > Using accessors it is easy to take such a default value, and "modify" > a couple of fields, like: > > let myWindowDesc = set title "Haskell" . set size (640,480) . set > background Blue . set fontFamily Arial $ defaultWindowDesc > > However, I guess this would make a lot of intermediate > WindowDescription copies no (whether the fields are strict or not)? So > ideally for performance, all these "updates" should be fused, maybe > running inside an ST monad? > > I'm not sure if any of this is valid, but I would like to understand > more about this, so any links and hints are welcome :-) > > Peter Verswyvelen > _______________________________________________ > Haskell-Cafe mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
