in reply to Inheritance based on input
Sounds like you're looking for something along the lines of the Adapter pattern (and/or the Facade pattern). Your DeviceClass would be a factory which returns instances of DeviceAdapter::Device1 or what not; DeviceAdapter::Foo would convert from your generic interface into the correct calls on a Foo instance, DeviceAdapter::Bar similar for Bar instances.
The cake is a lie.
The cake is a lie.
The cake is a lie.
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