asTorchView doesn't work on non-declared seq about flambeau

[Clonkk]

@HugoGranstrom I think this is mostly fixed and I propose we close this. I've reviewed the high level API and it uses openArray or Varargs for most procs and convert with as TorchView internally.

The low level API will still rely on asTorchView / ArrayRef so be as close as C++ Torch as possible.

[HugoGranstrom]

I've stumbled upon this a fair bit myself. The problem is that the expression is inline and doesn't have an address. So if we just assign it to a variable in asTorchView it does work:

template asTorchView*[T](oa: openarray[T]): ArrayRef[T] =
  let a = oa
  ArrayRef[T].init(a[0].unsafeAddr, oa.len)

Not sure if we introduce unneccecary copies though, but as oa is openarray it should only be the pointer+len that is copied into a.

[HugoGranstrom]

Even though this works, I still think we should expose openarray for the high-level API. asTorchView is 11 characters too long for me 😝