Struct FunctionArity 

pub struct FunctionArity { /* private fields */ }

Immutable SQL-visible argument-count contract for a registered function.

Construct this once from user metadata and publish it alongside the function object. Runtime lookup uses only this value, never re-entering user-defined metadata callbacks.

Implementations

impl FunctionArity

pub fn exact(num_args: i32) -> Self

Construct an exact-arity contract.

pub fn variadic(min_args: i32, max_args: Option<i32>) -> Self

Construct a variadic contract with inclusive argument-count bounds.

pub const fn declared_args(self) -> i32

Registry key arity (-1 for a variadic contract).

pub const fn min_args(self) -> i32

Minimum accepted SQL-visible argument count.

pub const fn max_args(self) -> Option<i32>

Maximum accepted SQL-visible argument count, or None when unbounded.

pub fn accepts(self, num_args: i32) -> bool

Whether this contract accepts num_args SQL-visible arguments.

Trait Implementations

impl Clone for FunctionArity

fn clone(&self) -> FunctionArity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FunctionArity

impl Debug for FunctionArity

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

Formats the value using the given formatter.

impl Eq for FunctionArity

impl Hash for FunctionArity

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 FunctionArity

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

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for FunctionArity

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