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

[Andrew Coppin]

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 
myself...

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...