Struct Composed 

pub struct Composed<L1, L2, B> { /* private fields */ }

Composed lens: outer ∘ inner.

First uses outer to access an intermediate value, then inner to access the final target within it.

Trait Implementations

impl<S, B, A, L1, L2> Lens<S, A> for Composed<L1, L2, B>

where L1: Lens<S, B>, L2: Lens<B, A>, B: Clone,

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.