pub fn is_empty(&self) -> bool {
        for i in 0..MEMTABLE_SLOT_COUNT {
            if !self.slots[i].read().is_empty() {
                return false;
            }
        }
        true
    }
/// Returns `true` if it does not contains any memtable.
Returns `true` if it does not contains any memtable.
Returns ` true ` if it does not contains any memtable .
pub fn is_empty(&self) -> bool {
        for i in 0..MEMTABLE_SLOT_COUNT {
            if !self.slots[i].read().is_empty() {
                return false;
            }
        }
        true
    }
pub fn is_empty ( & self ) -> bool { for i in 0 .. MEMTABLE_SLOT_COUNT { if ! self . slots [ i ] . read ( ) . is_empty ( ) { return false ; } } true }
Returns `true` if it does not contains any memtable.
Returns ` true ` if it does not contains any memtable .
&self