Unsafe functions
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Unsafe functions can break type safety (unsafeCoerce#, unsafePerformIO), | Unsafe functions can break type safety (unsafeCoerce#, unsafePerformIO), | ||
| - | interfere with lazy IO (unsafeInterleaveIO), or break | + | interfere with lazy IO (unsafeInterleaveIO), or break [http://en.wikipedia.org/wiki/Parametricity parametricity] (seq). |
Their use (except in the case of <hask>seq</hask>) would require some | Their use (except in the case of <hask>seq</hask>) would require some | ||
kind of assurance on the part of the programmer that what they're doing | kind of assurance on the part of the programmer that what they're doing | ||
Revision as of 12:52, 26 August 2007
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 ofseq
kind of assurance on the part of the programmer that what they're doing is safe.
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