Trait orx_closure::FunResRef

pub trait FunResRef<In, Out: ?Sized, Error> {
    // Required method
    fn call(&self, input: In) -> Result<&Out, Error>;
}

Function trait representing In -> Result<&Out, Error> transformation.

It provides the common interface for closures, such as ClosureResRef<Capture, In, Out>, over all capture types.

Furthermore, this trait enables to forget about the capture, or equivalently drop the Capture generic parameter, by using dyn FunOptRef<In, Out> trait object.

Relation with Fn

FunResRef<In, Out, Error> can be considered equivalent to Fn(In) -> Result<&Out, Error>.

However, it appears to be impossible to have an instance of the latter due to lifetime errors. Therefore, FunResRef<In, Out, Error> is required.

Required Methods

fn call(&self, input: In) -> Result<&Out, Error>

Calls the function with the given input and returns the produced output.

Implementors

impl<C1, C2, C3, C4, In, Out: ?Sized, Error> FunResRef<In, Out, Error> for ClosureResRefOneOf4<C1, C2, C3, C4, In, Out, Error>

impl<C1, C2, C3, In, Out: ?Sized, Error> FunResRef<In, Out, Error> for ClosureResRefOneOf3<C1, C2, C3, In, Out, Error>

impl<C1, C2, In, Out: ?Sized, Error> FunResRef<In, Out, Error> for ClosureResRefOneOf2<C1, C2, In, Out, Error>

impl<Capture, In, Out: ?Sized, Error> FunResRef<In, Out, Error> for ClosureResRef<Capture, In, Out, Error>