Struct Function 

pub struct Function<NumericTypes: EvalexprNumericTypes> { /* private fields */ }

A user-defined function. Functions can be used in expressions by storing them in a Context.

Examples

use evalexpr::*;

let mut context = HashMapContext::<DefaultNumericTypes>::new();
context.set_function("id".into(), Function::new(|argument| {
    Ok(argument.clone())
})).unwrap(); // Do proper error handling here
assert_eq!(eval_with_context("id(4)", &context), Ok(Value::from_int(4)));

Implementations

impl<NumericTypes: EvalexprNumericTypes> Function<NumericTypes>

pub fn new<F>(function: F) -> Self

where F: Fn(&Value<NumericTypes>) -> EvalexprResultValue<NumericTypes> + Send + Sync + 'static + Clone,

Creates a user-defined function.

The function is boxed for storage.

Trait Implementations

impl<NumericTypes: EvalexprNumericTypes> Clone for Function<NumericTypes>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<NumericTypes: EvalexprNumericTypes> Debug for Function<NumericTypes>

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

Formats the value using the given formatter.