Re: [Haskell-cafe] how to check thunk

There is also the 'isevaluated' package (which depends on vacuum, but seems to do something more involved than your code). Erik On Mon, Jul 2, 2012 at 7:40 AM, Chaddaï Fouché wrote:

On Mon, Jul 2, 2012 at 5:29 AM, Kazu Yamamoto wrote:

...

Hello,

Are there any ways to see if a value is a thunk or memorized? I would like to have a function like:   isThunk :: a -> IO Bool

vacuum allow that and much more though I don't know if it still works correctly on GHC 7.4. Anyway your isThunk is

...

isThunk a = fmap GHC.Vacuum.ClosureType.isThunk GHC.Vacuum.closureType

(Feel free to arrange your imports to make that a bit more readable ;)

http://hackage.haskell.org/package/vacuum -- Jedaï

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