In the exercise you can play with subviews. The skeleton code subviews.cpp contains
a single 2D array. Your tasks are following:
- Create subviews for the boundaries (top, bottom, left, right), and initialize
the boundaries with the hel pof subviews using a
parallel_for. - Copy the boundary data to the host. For this, you need contiguous buffers on the device (copying data between non-contiguous views is possible only within the same execution space), and their mirror views on the host.
- Print out the boundary values on the host.