C++20 will contain a std::span<> class that provides view over a
contiguous sequence of objects, the storage of which is owned by some
other object.
Add a compatible implementation to the utils namespace. This will be
used to implement array controls.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
