Trait MergeFn
rocksdb::merge_operator
pub trait MergeFn: Fn(&[u8], Option<&[u8]>, &mut MergeOperands) -> Option<Vec<u8>> + Send + Sync + 'static { }
impl<F> MergeFn for F where F: Fn(&[u8], Option<&[u8]>, &mut MergeOperands) -> Option<Vec<u8>> + Send + Sync + 'static,