Struct FunctionSelector 

pub struct FunctionSelector(pub [u8; 4]);

A 4-byte function selector used to identify contract functions.

Tuple Fields

0: [u8; 4]

Implementations

impl FunctionSelector

pub fn from_hex(value: &str) -> Result<Self, Error>

Parse a function selector from a hex string (e.g. "0xaabbccdd").

pub fn from_field(field: Fr) -> Self

Convert a field element to a function selector using its low 32 bits.

pub fn from_signature(signature: &str) -> Self

Compute a function selector from a Noir function signature string.

Aztec computes selectors by Poseidon2-hashing the raw signature bytes and taking the low 32 bits of the resulting field element.

Example

let selector = FunctionSelector::from_signature("sponsor_unconditionally()");

pub fn from_name_and_parameters(name: &str, params: &[AbiParameter]) -> Self

Derive a function selector from a function name and its ABI parameters.

Constructs the canonical Noir signature (e.g., transfer(Field,Field,u64)) and computes the Poseidon2-based selector from it.

pub fn to_field(self) -> Fr

Convert this selector to its field representation.

Trait Implementations

impl Clone for FunctionSelector

fn clone(&self) -> FunctionSelector

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionSelector

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FunctionSelector

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for FunctionSelector

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

Formats the value using the given formatter.

impl Hash for FunctionSelector

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 FunctionSelector

fn eq(&self, other: &FunctionSelector) -> 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 Serialize for FunctionSelector

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 FunctionSelector

impl Eq for FunctionSelector

impl StructuralPartialEq for FunctionSelector