Overrides: HistoryCrum
If this hcrum represents a fork, then it must get its own canopy crum.
Overrides: HistoryCrum
find the canopyCrum that goes with this hCrum.
Overrides: HistoryCrum
Overrides: HistoryCrum
Overrides: HistoryCrum
Overrides: HistoryCrum
Return true if the receiver can backfollow to trace.
Overrides: HistoryCrum
Return true if their are no upward pointers. This is used
by OParts to determine if they can be forgotten.
Overrides: HistoryCrum
return the mapping into the domain space of the given trace
Overrides: HistoryCrum
Overrides: HistoryCrum
If bertCrum is leafward of newBCrum then change it and return true,
otherwise return false.
Overrides: HistoryCrum
Make a history crum with no upward pointers.
Overrides: HistoryCrum
Overrides: HistoryCrum
Make my bertCrum the join of its current value and bCrum.