The number of calls to process that resulted in a change (a non-empty DiffList)
The number of calls to process(numIterations:Int) or process(contexts:C,numIterations:Int).
If true, calls to "newDiffList" will create a new DiffList to describe the changes they made, otherwise "newDiffList" will return null.
In your implementation of "process1" use this method to optionally create a new DiffList, obeying "makeNewDiffList".
Convenient method for setting makeNewDiffList to false, and returning this.
Called after each iteration of sampling the full list of variables.
Call just after each step of sampling.
Called just before each step of sampling.
Do one step of sampling.
The underlying protected method that actually does the work.
The number of calls to process(context:C)
Abstract method must be implemented in sub-classes.