On Thu, 15 May 2003 22:07:56 +0200
Christian Buschmann
Why not:
isNullPtr = (==nullPtr)
? Oh sure....sorry.... i tried this before, but i had a small confusion with my type-signatures in my program and it didn't work. Now i fixed my signatures and its working.... But there is one more (small) question: If i am using the "peekCString" function with a null-pointer my
Hal Daume III wrote: program crashes, because the peekCString function is trying to read a String from an illegal address. But is this normal behaviour of this function? Shouldn't it check for a null-pointer and then return an empty String, raise an exception or do something else than crashing my program?
Oh, and my compiler is ghc-5.04.2 on linux-2.4.20
thx christian
It DEFINITELY should NOT return an empty string. Further, I imagine it would be pretty painful to check for a nullPointer every time you could use it (i.e. in this case and other cases, it would be arbitrary to just usi it in this case.) I'd rather it be a fast and small as possible. If I really want the checking it is trivial to write it myself. checkedPeekCString p | isNullPtr p = ioError uhoh | otherwise = peekCString p