Resolved checking device compatibility

InputDevice gamepad = InputSystem.AddDevice<Gamepad>();
inputActionMap.IsUsableWith(gamepad);

the documentation shows that this is how to check if an input device is able to function with an InputActionMap. But IsUsableWith does not exist when I compile!!

----------------------------
what I want to do is check if the device is compatible with my InputAction binding... BUT only for a specific deivice.

InputControlPath.TryFindControl(device, binding.effectivePath);
--> this will show me if the binding will function on a specific device and can alert the user if the device is imcompatible with my Input System.
BUT I want to make sure the device being checked is the same.
so like this:
if( device.type = binding.device.type )

since the binding "<Keyboard>/space" should NOT work with a gamepad so no check is needed to be made.

so how can I tell the what device is the binding for??

 

I managed to make it work like this:

foreach (InputBinding binding in inputAction.bindings)

{

       if (Keyboard.current != null && InputControlPath.TryGetDeviceLayout(binding.effectivePath) == "Keyboard")

      {

                var control = InputControlPath.TryFindControl(Keyboard.current, binding.effectivePath);

                if (control == null)

                {

                    //error code here//

                    Debug.Log("keyboard key is bound to an input that does not exist on the device!!");

                    break;

                }

      }

}

can get action from the asset:
InputAction inputAction =InputActionAsset.actions[0];
or make a new action yourself and add bindings:
InputAction inputAction = new InputAction();
inputAction.AddBinding("<Mouse>/leftButton");
inputAction.AddBinding("<Keyboard>/anyKeyYouWantHere");

 

for gamepads example:

foreach (InputBinding binding in inputAction.bindings)

{

       if (Gamepad.current != null && InputControlPath.TryGetDeviceLayout(binding.effectivePath) == "Gamepad")

      {

                var control = InputControlPath.TryFindControl(Gamepad.current, binding.effectivePath);

                if (control == null)

                {

                    //error code here//

                    Debug.Log("Gamepad button is bound to an input that does not exist on the device!!");

                    break;

                }

      }

}