Struct Target 

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

An opaque execution target token.

This was an enum until 0.3.0, and the change is deliberate: the compiler has no business knowing that a target is called “host”. It compares tokens, orders them, and folds them into the plan hash — nothing more. The domain layer names them (ADR 0034), exactly as it already names DomainToken.

THE ORDINALS ARE WIRE. They are folded into graph_id and plan_id as little-endian u32, and #[serde(transparent)] makes the postcard encoding byte-identical to the variant indices the enum emitted. The values below are therefore historically assigned and may never be renumbered.

Debug is wire too, and that is less obvious: KernelDescriptor::lowering is conventionally built as format!("{target:?}"), and lowering is a hashed field. The hand-written Debug below reproduces the enum’s output exactly for that reason; a derived one would print Target(1) and move every plan id in the fleet without touching an ordinal.

Implementations

impl Target

pub const McuAot: Self

Historically assigned 0.

pub const Host: Self

Historically assigned 1.

pub const BlutDurable: Self

Historically assigned 2.

pub const KNOWN: [Self; 3]

Every token this version of the crate knows, in ordinal order.

pub const fn token(self) -> u32

The wire value. Named token rather than as u32 so that the cast sites are greppable and cannot be written by accident.

pub const fn from_token(token: u32) -> Self

Build a token from a wire value, WITHOUT range checking — decoding untrusted bytes must call is_known as well. See is_known.

pub const fn is_known(self) -> bool

Whether this token is one this version assigns a meaning to.

The enum’s derived Deserialize used to reject an out-of-range variant index for free. A transparent newtype accepts any u32, so the check that was implicit is explicit here, and from_aot_bytes calls it.

Trait Implementations

impl Clone for Target

fn clone(&self) -> Target

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Target

impl Debug for Target

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Target

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Target

impl Hash for Target

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 Target

fn cmp(&self, other: &Target) -> 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.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Target

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Target

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

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 Target