[Haskell-beginners] How to display a time difference?
gale at sefer.org
Wed Mar 18 06:21:16 EDT 2009
Colin Paul Adams wrote:
> The code of the following routine is intended to indicate how long it
> takes for the computer to make a move. However the time is printed (as
> very close to zero) long before the move is made.
You are writing a thunk to the IORef. It only gets computed
later on when you read the value.
> readIORef game_state_ior >>=
> evaluate . update_interactive_from_move move >>=
> writeIORef game_state_ior
evaluate is in Control.Exception.
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