Struct FieldLens 

pub struct FieldLens<G, P> { /* private fields */ }

A lens built from getter and setter closures.

Trait Implementations

impl<S, A, G, P> Lens<S, A> for FieldLens<G, P>

where G: Fn(&S) -> A, P: Fn(&mut S, A),

fn view(&self, whole: &S) -> A

View the focused part.

fn set(&self, whole: &mut S, part: A)

Set the focused part, mutating the whole in place.

fn over(&self, whole: &mut S, f: impl FnOnce(A) -> A)

where A: Clone,

Modify the focused part with a function.

fn then<B, L2: Lens<A, B>>(self, inner: L2) -> Composed<Self, L2, A>

where Self: Sized, A: Clone,

Compose this lens with an inner lens to focus deeper.