Generates a deterministic checksum for an R object such that (i) if the same object is used again, then the same checksum is obtained, and (ii) if another object is used, then a different checksum is obtained with extremely high probability. In other words, it is highly unlikely that two different objects have the same checksum.
The object for which a checksum should be calculated.
Additional arguments passed to
getChecksum() is a generic function,
it is possible to provide custom methods for specific
classes of objects. This means that, if a certain class
specifies fields that carry auxillary data, then these
can be excluded from the checksum calculation.
For instance, assume that all objects of class 'TimestampedObject'
contain timestamps specifying when each object was created.
Then a custom
getChecksum() method for this class can
first drop the timestamp and then call the default
Returns checksum represented as a
digest method is used to calculate
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