Struct arithmetic_eval::fns::Fold

pub struct Fold;

Reduce (aka fold) function that reduces the provided tuple to a single value.

Type

fn<T, Acc>([T], Acc, fn(Acc, T) -> Acc) -> Acc

Examples

let program = r#"
    xs = (1, -2, 3, -7);
    fold(xs, 1, |acc, x| acc * x) == 42
"#;
let block = F32Grammar::parse_statements(Span::new(program)).unwrap();

let mut interpreter = Interpreter::new();
interpreter
    .insert_native_fn("fold", fns::Fold);
let ret = interpreter.evaluate(&block).unwrap();
assert_eq!(ret, Value::Bool(true));

Trait Implementations

impl Clone for Fold

fn clone(&self) -> Fold

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for Fold

impl Debug for Fold

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

Formats the value using the given formatter.

impl<T> NativeFn<T> for Fold where
    T: Grammar,
    T::Lit: Num + Neg<Output = T::Lit> + Pow<T::Lit, Output = T::Lit>, 

fn evaluate<'a>(
    &self,
    args: Vec<SpannedValue<'a, T>>,
    ctx: &mut CallContext<'_, 'a>
) -> EvalResult<'a, T>

Executes the function on the specified arguments.