Unsafe functions
(Redirected from UnsafePerformIO)
Categories: Stub articles | Idioms
There are a number of unsafe functions in the libraries.
-
unsafePerformIO :: IO a -> a -
unsafeInterleaveIO :: IO a -> IO a -
unsafeInterleaveST :: ST s a -> ST s a -
unsafeIOToST :: IO a -> ST s a -
unsafeIOToSTM :: IO a -> STM a -
unsafeFreeze, unsafeThaw -
unsafeCoerce# :: a -> b -
seq :: a -> b -> b
Unsafe functions can break type safety (unsafeCoerce#, unsafePerformIO),
interfere with lazy IO (unsafeInterleaveIO), or break parametricity (seq).
Their use (except in the case of seq) would require some
kind of assurance on the part of the programmer that what they're doing
is safe.
"unsafe" is also a keyword which can be used in a foreign import declaration.
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