Export the special span
value for not-indexing an array dimension.
#61
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The special value
span
is quite important for effective array slicing in ArrayFire, but it was not previously exposed in the Haskell bindings. Indeed, as this is a constant rather than a function it cannot be imported (?) using the FFI, but the same value can simply be hardcoded as a Haskell constant.Without this export, users could also hard-code it at each use site. But that would result in cryptic code, not to mention unsafe if the definition of
af_span
should ever change. It's certainly better to have it available in the library.