Struct AffineTraversal 

pub struct AffineTraversal<S, A> { /* private fields */ }

An affine traversal (0 or 1 focus).

Implementations

impl<S: 'static, A: 'static> AffineTraversal<S, A>

pub fn new( preview: impl Fn(&S) -> Option<A> + 'static, set: impl Fn(A, S) -> S + 'static, ) -> Self

Create an affine traversal.

pub fn preview(&self, s: &S) -> Option<A>

Preview the focus.

pub fn set(&self, a: A, s: S) -> S

Set the focus if present.