Struct Eid 

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

Internal Edge ID (64 bits) — pure auto-increment.

EIDs are dense, sequential identifiers assigned on edge creation; they no longer embed type information (edge-type lookups go via the edge tables).

Implementations

impl Eid

pub const INVALID: Eid

Sentinel value representing an invalid/null id.

pub const EPHEMERAL_BIT: u64

Top bit reserved for ephemeral (transient, in-query) identities allocated by host.allocate_transient_id() (M5g / proposal §4.13.1). Storage write paths must reject any id with this bit set.

pub fn new(id: u64) -> Self

Creates a new id from a raw u64 value.

pub fn as_u64(&self) -> u64

Returns the raw u64 value of this id.

pub fn is_invalid(&self) -> bool

Check if this id is the invalid sentinel.

pub fn ephemeral(transient_id: u64) -> Self

Construct an ephemeral id from a transient_id (bottom 63 bits). Returns INVALID if transient_id overflows the 63-bit range.

pub fn is_ephemeral(&self) -> bool

True if this id’s high bit is set, i.e. it was minted by host.allocate_transient_id() and is not backed by storage. INVALID (all bits set) also satisfies this; callers that care about the distinction should check is_invalid() first.

pub fn transient_id(&self) -> Option<u64>

Bottom 63 bits when self is ephemeral, else None.

Trait Implementations

impl Clone for Eid

fn clone(&self) -> Eid

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Eid

impl Debug for Eid

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

Formats the value using the given formatter.

impl Default for Eid

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Eid

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Eid

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

Formats the value using the given formatter.

impl Eq for Eid

impl From<Eid> for u64

fn from(id: Eid) -> Self

Converts to this type from the input type.

impl From<u64> for Eid

fn from(val: u64) -> Self

Converts to this type from the input type.

impl FromStr for Eid

type Err = Error

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self>

Parses a string s to return a value of this type.

impl Hash for Eid

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 Eid

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

fn eq(&self, other: &Eid) -> 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 Eid

fn partial_cmp(&self, other: &Eid) -> 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 Eid

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Eid

impl TryFrom<&Value> for Eid

type Error = UniError

The type returned in the event of a conversion error.

fn try_from(value: &Value) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Value> for Eid

type Error = UniError

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<Self, Self::Error>

Performs the conversion.