Struct Function 

pub struct Function<'host> { /* private fields */ }

An function which is callable by espy or its host.

This differs from Program in that it may accept an argument; use Function::pipe or Function::piped to provide one, and Function::eval to evaluate the function.

To instead provide a Rust function to espy, use Function::borrow or Function::owned with the ExternFn and ExternFnOwned traits, respectively.

Implementations

impl<'host> Function<'host>

pub fn borrow(external: &'host dyn ExternFn) -> Self

pub fn owned(external: Rc<dyn ExternFnOwned>) -> Self

pub fn to_static(&self) -> Option<StaticFunction>

pub fn eval(self) -> Result<Value<'host>, Error>

Errors

Returns an error if evaluating the function results in an error

pub fn pipe(&mut self, argument: Value<'host>)

Concatentes the function’s argument list with argument.

pub fn piped(self, argument: Value<'host>) -> Self

Trait Implementations

impl<'host> Clone for Function<'host>

fn clone(&self) -> Function<'host>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'host> Debug for Function<'host>

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

Formats the value using the given formatter.

impl<'host> From<Function<'host>> for Value<'host>

fn from(f: Function<'host>) -> Self

Converts to this type from the input type.

impl<'host, T: Borrow<StaticFunction>> From<T> for Function<'host>

fn from(value: T) -> Self

Converts to this type from the input type.

impl<'host> TryFrom<Value<'host>> for Function<'host>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value<'host>) -> Result<Self, Self::Error>

Performs the conversion.