Struct TxnId 

pub struct TxnId(pub u64);

Identifies a running transaction. Drawn from the same counter as Timestamp so that ids and timestamps never collide.

Tuple Fields

0: u64

Implementations

impl TxnId

pub const NONE: TxnId

An id belonging to no transaction.

Reading with this id makes every in-flight version invisible, including the reader’s own — which is what commit-time read validation wants: it must compare against what other transactions have committed, not against its own uncommitted writes. 0 is never handed out, because the oracle’s counter starts at 1.

pub const fn tagged(self) -> u64

Encode this id into the tagged representation stored in a version’s begin/end field while the transaction is still in flight.

Trait Implementations

impl Clone for TxnId

fn clone(&self) -> TxnId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TxnId

impl Debug for TxnId

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

Formats the value using the given formatter.

impl Eq for TxnId

impl Hash for TxnId

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 Ord for TxnId

fn cmp(&self, other: &TxnId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for TxnId

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for TxnId

fn partial_cmp(&self, other: &TxnId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for TxnId