Propose to make the device wrapper of PyDirectML for C++ sample usage

[huningxin]

The device wrapper of Python samples is a quite good helper for DirectML device and resource management. I propose to make it also useful for C++ sample, e.g. HelloDirectML . That would simplify the C++ sample and improve the code reuse.

Any thoughts?

[jstoecker]

It's an interesting suggestion! I believe the original intent with HelloDirectML was to write the shortest possible code sample, without any superfluous code, that does a step-by-step walk-through of the stages of initializing and executing a single operator. I personally agree that this sample could be cleaned up a bit, though it's tricky to introduce abstractions here without muddying key concepts like binding, operator initialization, and operator dispatching. The style of abstractions that work best really depend on the application.

[huningxin]

Probably HelloDirectML could have two code paths that illustrate both the step-by-step and the abstract ways. Just like it uses USE_DMLX for graph building.