Struct SnapshotId 

pub struct SnapshotId(/* private fields */);

Opaque identifier for a single live MVCC reader snapshot.

The id is monotonic per-pager; the value is otherwise meaningless to callers — it only exists so the (private) SnapshotPin RAII guard can deregister the right entry from the pager’s live- snapshots map when it drops.

SnapshotId is a #[repr(transparent)] newtype over u64 (Power- of-Ten Rule 5). The serde encoding is #[serde(transparent)] so the bytes are identical to the bare u64; today SnapshotId is purely in-memory, but the transparent encoding preserves wire compatibility for any future diagnostics record that names it.

Implementations

impl SnapshotId

pub const fn new(raw: u64) -> Self

Construct a SnapshotId from a raw u64. Total function — any u64 (including 0) is a valid snapshot id.

pub const fn get(self) -> u64

The raw id. Exposed for diagnostics.

Trait Implementations

impl Clone for SnapshotId

fn clone(&self) -> SnapshotId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SnapshotId

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SnapshotId

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for SnapshotId

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 SnapshotId

fn cmp(&self, other: &SnapshotId) -> 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 SnapshotId

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for SnapshotId

fn partial_cmp(&self, other: &SnapshotId) -> 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 Serialize for SnapshotId

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for SnapshotId

impl Eq for SnapshotId

impl StructuralPartialEq for SnapshotId