Trait rocksdb::merge_operator::MergeFn

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pub trait MergeFn: Fn(&[u8], Option<&[u8]>, &MergeOperands) -> Option<Vec<u8>> + Send + Sync + 'static { }

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impl<F> MergeFn for F
where F: Fn(&[u8], Option<&[u8]>, &MergeOperands) -> Option<Vec<u8>> + Send + Sync + 'static,