remove supported? about libcuckoo HOT 4 CLOSED

It seems like the update_fn / upsert necessary functionality is pretty similar to the iterator functionality, so I'm thinking about a way to combine the two concepts. #32 asks for the same functionality for iterators.

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Ah, I read that issue and didn't realize it was basically the same thing. Yes, we want an update_fn that can conditionally erase an element based on its data. Like I said, simply allowing the lambda to return a boolean would be ideal for us. (uprase_fn?)

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A few light transaction functions have been added in my new pull request.
The most important functions include:

1. find_fn/erase_fn/update_fn
2. find_or_insert/update_or_insert/delete_or_insert
   update_insert is another implementation of upsert, which should have better efficiency than the current upsert.

The code and examples have been uploaded to my fork also, https://github.com/MRYingLEE/libcuckoo-transaction.

I think what I did is what you expected.

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The tip of future-master should now provide this functionality through erase_fn.

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