Struct PredicateSignature 

pub struct PredicateSignature {
    pub name: String,
    pub arg_types: Vec<TypeAnnotation>,
    pub arity: usize,
}

Signature for a predicate: defines expected argument types

Fields

name: String

arg_types: Vec<TypeAnnotation>

arity: usize

Implementations

impl PredicateSignature

pub fn new(name: impl Into<String>, arg_types: Vec<TypeAnnotation>) -> Self

pub fn untyped(name: impl Into<String>, arity: usize) -> Self

Create an untyped signature (for backward compatibility)

pub fn matches_arity(&self, arg_count: usize) -> bool

Check if this signature matches the given number of arguments

pub fn matches_types(&self, arg_types: &[Option<&TypeAnnotation>]) -> bool

Check if the given argument types match this signature

Trait Implementations

impl Clone for PredicateSignature

fn clone(&self) -> PredicateSignature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PredicateSignature

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PredicateSignature

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for PredicateSignature

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

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for PredicateSignature

impl StructuralPartialEq for PredicateSignature