MVRVariableIfc

A new instance with the same parameters whose stream is an antithetic copy of this variable's stream, in its current state. Everything the instance samples, including the components of a variable built from component variables, draws from that copy, so its samples pair with this variable's. Its stream controls (reset, substreams) act on that copy, independently of this variable; applying the same controls to both keeps them paired. The copy is not held by the stream provider, so the provider's operations on the streams it holds do not reach it.