Split propagate function into client components #850
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The current detray code exposes primarily a
propagate
method, but this has an unbounded loop in it. Because callers might want to implement custom load balancing on the stepping process, the current approach may be too coarse. This commit retains the existingpropagate
method but also adds three new component methods,propagate_init
,propagate_step
, andpropagate_is_complete
so that client code can more granularly implement their own, load-balanced propagation.