Enum LogCursor 

pub enum LogCursor {
    Oldest,
    Sequence(u64),
    Position(u64),
    Time(Date, Time),
}

Where a paged log read starts, or resumes from a checkpoint.

Variants

Oldest

The oldest record the log holds, found from its Record_Count and Total_Record_Count; the read goes on by sequence number.

Sequence(u64)

The record with this sequence number, then on by sequence number.

Position(u64)

The record at this one-based position, then on by position. The fallback for a device whose sequence numbers are inconsistent, which fails a sequence read with Error::LogNotAdvancing. Not for a log that is merely full: each record it drops shifts every position, so a position read of a busy full log skips records without a gap.

Time(Date, Time)

The first record newer than this date and time, which must be specific; the read goes on by sequence number.

Trait Implementations

impl Clone for LogCursor

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for LogCursor

impl Debug for LogCursor

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for LogCursor

impl Hash for LogCursor

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for LogCursor

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for LogCursor