18 Nov
2011
18 Nov
'11
7 a.m.
Okay, thanks
I was pretty sure I was wrong (or else somebody would already have come up
with that solution), but I wanted to know why.
2011/11/18 Daniel Fischer
On Friday 18 November 2011, 11:18:33, Yves Parès wrote:
Instead of rewriting modifySTRef, why not just do :
modifySTRef counter (\x -> let y = x+1 in y `seq` y)
Is there a problem with that?
Yes, y `seq` y is precisely the same as y.
a `seq` b means whenever evaluation of b is demanded, also evaluate a (to WHNF). So y `seq` y ~> whenever evaluation of y is demanded, also evaluate y.