[Haskell-cafe] Data.Vector.Mutable.mapM

Joachim Breitner mail at joachim-breitner.de
Fri Oct 21 18:08:32 CEST 2011


Am Donnerstag, den 20.10.2011, 23:10 +0200 schrieb Ertugrul Soeylemez:
> In general you should try to work with immutable vectors as much as
> possible.  Done properly you shouldn't lose much performance that way.
> However, sometimes an operation is just much easier to express and
> faster with the MVector interface.  In these cases you can escape to the
> mutable interface using 'create', 'modify', 'thaw' and 'freeze'.  Don't
> forget that you lose fusion that way, though.
> In other words:  Don't use MVector exclusively.  Use it only when you
> really need it.

that was my plan, although it is a bit more complicated as I have a
immutable vector of immutable boxed vectors that I’d like to modify
destructively. Currently, I have lots of V.map and V.filter...

The code is here, and should perform constant propagation in a


Joachim "nomeata" Breitner
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