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germasch
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LGTM.
As I'm looking at the code, I'm wondering if it wouldn't be better to have these as singletons, though. Since there's, I suppose, one ProcessGenerator per process, singleton would seem appropriate ;) I think the implementation already actually follows the singleton pattern, but then it seems unnecessary to make a shared_ptr, since the use count will never go back down to zero, anyway.
enables manual seeding
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Hacky way to seed rngs with constant values. Useful for e.g. initializing the same realization of magnetic turbulence across all processes.