19 Dec
2006
19 Dec
'06
1:09 a.m.
Hello, 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! Regards, Axel -- Phone: +46 8 790 4124, Email: axel@kth.se, Web: www.it.kth.se/~axel -- --- Phone: +46 8 790 4124, Email: axel@imit.kth.se, Web: www.imit.kth.se/~axel