Force single evaluation?
axel at kth.se
Mon Dec 18 11:09:45 EST 2006
I call a C function from a Haskell program. I am using unsafePerformIO
to use it outside a monad.
Even though the C function does not have any side effect, I absolutely
don't want to evaluate it more than once for performance reasons. But my
impression is that it is evaluated several times.
1. Can I monitor somehow how often it is evaluated?
2. Can I ensure that the function is evaluated only once?
I am using ghc 6.4.1
I ma grateful for any hint!
Phone: +46 8 790 4124, Email: axel at kth.se, Web: www.it.kth.se/~axel
Phone: +46 8 790 4124, Email: axel at imit.kth.se, Web: www.imit.kth.se/~axel
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