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15991709
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2013-04-13T19:02:48.150
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2013-04-13T19:02:48.150
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Okay. So I solved the problem. It is indeed a typeclass thing. And it has only confused me more. However, I do have an answer to the solution. But do feel free to help my understanding out. First, some digging. The function createStringNul has type <pre><code>createString :: String -> TGlobal (Array n Word8) </code></pre> Fine. The problem the compiler was having is that the "n" in the Array type is ambiguous. It could literally be anything in the world. Lookup, Array, and you see <pre><code>newtype Array n a </code></pre> Now it is not so obvious, but upon a little digging, in particular wrt the call to getElementPtr, one finds that the n, really should be a Nat n, which is a type-level way to fix the size of the array. Now, the definition of Array n a, does not actually care it is really just a type synonym for [a]. So you can use D0, or D9 or whatever you want from the Data.TypeLevel.Num.Reps package. Fixing the size of the array, while a good idea was not actually taken into consideration by this function. But anyways, changing greetz <- createStringNul "Hello, World!" to greetz <- createStringNul "Hello, World!" :: TGlobal (Array D0 Word8) works. Here is the interesting part... I did not expect it to work. D0 is supposed to be 0, so I did not understand why it was allowing me to store so many characters in a 0 size "Array" However, if you look at the source code, it is immediately clear that the type restriction is not actually payed attention to. Fine, whatever, upon compiling one realizes that the createStringNul is deprecated, and withStringNul is preferred instead. Except I don't completely understand how withStringNul's types work.
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1. POHaskell LLVM binding Ambiguous Type
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1. USJonathan Gallagher
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1. POHaskell LLVM binding Ambiguous Type
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