On 11-10-20 01:38 PM, thomas burt wrote:
I've been trying to measure execution time for some code I'm running
with the StateT monad transformer.
I have a function f :: StateT MyState IO a
Now, I measure the time it takes to run an invocation of this function
from beginning to end, i.e.
f = do
t0 <- getCurrentTime
stuffToDo
t1 <- getCurrentTime
liftIO $ putStrLn (show $ diffUTCTime t1 t0)
And also measure like this:
g :: IO
g = do
t0 <- getCurrentTime
(val,newState) <- runStateT f initialState
t1 <- getCurrentTime
putStrLn $ "outside: " ++ (show $ diffUTCTime t1 t0)
Where can I find stuffToDo?
How do you get away with getCurrentTime (as opposed to liftIO
getCurrentTime) inside f? Does not type-check.
How much should I trust this code?
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