Struct Setter 

pub struct Setter<S, T, A, B> { /* private fields */ }

A modify-only optic. Always uses boxed closures since setters are typically derived from composition or conversion.

S — source, T — modified source, A — focus, B — replacement.

Implementations

impl<S, T, A, B> Setter<S, T, A, B>

pub fn new( modify: impl Fn(S, &dyn Fn(A) -> B) -> T + 'static, ) -> Setter<S, T, A, B>

pub fn over(&self, s: S, f: impl Fn(A) -> B) -> T

Modify the focus using a function.

pub fn set(&self, s: S, b: B) -> T

where B: Clone,

Set the focus to a constant value.

Trait Implementations

impl<S, T, A, B> Optic for Setter<S, T, A, B>