[Haskell-cafe] fast Array operations: foldl, drop

Andrew Coppin andrewcoppin at btinternet.com
Thu Nov 29 15:54:15 EST 2007

Jules Bean wrote:
> As far as I'm aware, our arrays don't support any kind of zero-copy 
> slicing, which is what your 'drop' trick amounts to.
> Zero-copy slicing would seem like an obviously nice thing to have for 
> IArrays, though, I agree. For various different kinds of slices 
> including projections.
> ByteString supports zero-copy substring, but it's based on ForeignPtr 
> not UArray.

This is one of the many things I am often tempted to try to implement 

In general, the IArray and MArray interfaces seem to be lacking a huge 
number of functions which logically *should* be quite possible on an 
array, they just aren't implemented. Maybe one day I'll sit down and 
make a serious attempt to catelogue and implement them all...

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