Enum FunctionArity

pub enum FunctionArity {
    AtLeast(usize),
    Exactly(usize),
    Multi(Vec<usize>),
}

A struct representing the possible values of arity a function can have. Arity is just the number of arguments a function takes.

Variants

AtLeast(usize)

The function can be called with a number of arguments greater than or equal to the contained value.

Exactly(usize)

The function can be called with only the specified amount of arguments.

Multi(Vec<usize>)

The function can be called with any of the amounts of arguments stored in the vector.

Implementations

impl FunctionArity

pub fn check_arity(&self, num_args: usize) -> Result<(), LispError>

Check is the number of arguments passed to a function matches that functions arity.

Trait Implementations

impl Clone for FunctionArity

fn clone(&self) -> FunctionArity

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionArity

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

Formats the value using the given formatter.