Enum FunctionSignature 

pub enum FunctionSignature {
    Nullary(fn() -> Value),
    Unary(fn(&Value) -> Result<Value>),
    Binary(fn(&Value, &Value) -> Result<Value>),
    Ternary(fn(&Value, &Value, &Value) -> Result<Value>),
    Variadic(fn(&[Value]) -> Result<Value>),
    UnaryOptional(fn(&Value, Option<&Value>) -> Result<Value>),
    Aggregate(fn(&[Value]) -> Result<Value>),
}

Function signature types

Variants

Nullary(fn() -> Value)

Function with no arguments

Unary(fn(&Value) -> Result<Value>)

Function with one argument

Binary(fn(&Value, &Value) -> Result<Value>)

Function with two arguments

Ternary(fn(&Value, &Value, &Value) -> Result<Value>)

Function with three arguments

Variadic(fn(&[Value]) -> Result<Value>)

Function with variable arguments

UnaryOptional(fn(&Value, Option<&Value>) -> Result<Value>)

Function with optional second argument

Aggregate(fn(&[Value]) -> Result<Value>)

Aggregate function (operates on multiple values)

Trait Implementations

impl Clone for FunctionSignature

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionSignature

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

Formats the value using the given formatter.