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Imagine a use-case where someone would like to maintain a rolling CRC digest, while also regularly reading the sum of that CRC digest via the equivalent of calling finalize. This is a common pattern used by write ahead logs where you want to maintain a rolling CRC of all the data written to the log, while also embedding the rolling finalized value in each of the records written to disk.
As far as I can tell, the current APIs are not compatible with this use-case:
- The higher-level
Digeststruct'sfinalizemethod unnecessarily consumes itself via it'sselfreceiver, disallowing the interleaving of multiple calls toupdateandfinalize. - The lower level
Crcstructs don't makeupdateorfinalizepublic, disallowing consumes to write their own version ofDigestthat allows the interleaving of multiple calls toupdateandfinalize.
A workaround might be to clone the Digest before calling finalize which seems inefficient.
Any thoughts on this use-case and the best way to unlock it?
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