Enum Symbol 

pub enum Symbol {
    Const {
        name: Cow<'static, str>,
        value: Decimal,
        description: Option<Cow<'static, str>>,
    },
    Func {
        name: Cow<'static, str>,
        args: usize,
        variadic: bool,
        callback: fn(&[Decimal]) -> Result<Decimal, FuncError>,
        description: Option<Cow<'static, str>>,
    },
}

What a symbol represents in the language.

Variants

Const

Named constant (e.g., pi). Returns a Decimal for now.

Fields

name: Cow<'static, str>

value: Decimal

description: Option<Cow<'static, str>>

Func

Function with specified arity and callback.

Fields

name: Cow<'static, str>

args: usize

variadic: bool

callback: fn(&[Decimal]) -> Result<Decimal, FuncError>

description: Option<Cow<'static, str>>

Implementations

impl Symbol

pub fn name(&self) -> &str

pub fn description(&self) -> Option<&str>

Trait Implementations

impl Clone for Symbol

fn clone(&self) -> Symbol

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Symbol

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

Formats the value using the given formatter.