Struct arithmetic_eval::fns::Filter

pub struct Filter;

Filter function that evaluates the provided function on each item of the tuple and retains only elements for which the function returned true.

Type

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

Examples

let program = r#"
    xs = (1, -2, 3, -7, -0.3);
    filter(xs, |x| cmp(x, -1) == 1) == (1, 3, -0.3)
"#;
let block = F32Grammar::parse_statements(Span::new(program)).unwrap();

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

Trait Implementations

impl Clone for Filter

fn clone(&self) -> Filter

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for Filter

impl Debug for Filter

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

Formats the value using the given formatter.

impl<T> NativeFn<T> for Filter 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.