Bindings for views (or xstrided_views) about xtensor-python HOT 3 OPEN

With some of the recent additions this is definitly possible (at least for "easy" views that don't use the new islice), and for the strided view.

from xtensor-python.

I am interested in working on this. I wonder if there's a pointer (like a file or a PR) to the "easy" views that don't use the new islice?

My project needs to share large buffers among C++ and Python. It seems that, without the requested feature, xtensor-python always copies the buffer when an array is passed across the wrapper.

c = xt.C()
self.assertEqual([0.]*10, c.array.tolist())
# use __setitem__ implemented in C++ to set the element.
c[0] = 3
self.assertEqual([3.] + [0.]*9, c.array.tolist())
# c.array returns a copy while I want a view.
arr = c.array
arr[1] = 1
# FIXME: this assertion fails
self.assertEqual([3., 1.] + [0.]*8, c.array.tolist())

from xtensor-python.

The view mentioned here is the strided view. The idea would be to have a similar class in xtensor-python that embeds a xensor-python container and the python objetc for view

from xtensor-python.