pub(crate) fn maybe_first_index(&self) -> Option<u64> {
        self.snapshot
            .as_ref()
            .map(|snapshot| snapshot.get_metadata().get_index() + 1)
    }
// maybe_first_index returns the index of the first possible entry in entries
// if it has a snapshot.
maybe_first_index returns the index of the first possible entry in entries
if it has a snapshot.
maybe_first_index returns the index of the first possible entry in entries if it has a snapshot .
pub(crate) fn maybe_first_index(&self) -> Option<u64> {
        self.snapshot
            .as_ref()
            .map(|snapshot| snapshot.get_metadata().get_index() + 1)
    }
pub ( crate ) fn maybe_first_index ( & self ) -> Option < u64 > { self . snapshot . as_ref ( ) . map ( | snapshot | snapshot . get_metadata ( ) . get_index ( ) + 1 ) }
maybe_first_index returns the index of the first possible entry in entries
if it has a snapshot.
maybe_first_index returns the index of the first possible entry in entries if it has a snapshot .
&self