Function mapped_setter 

pub fn mapped_setter<S, A, SET>(
    set_fn: SET,
) -> SetterImpl<S, A, impl Setter<S, A>>
where
    SET: Fn(&mut S, A),

Creates a new Setter with the provided setter function.

Type Parameters

• S: The source type of the optic
• A: The target type of the optic

Arguments

• set_fn — A function that sets the focus value A from the source S.

Returns

A new SetterImpl instance that can be used as a Setter<S, A>.

Examples

use optics::{mapped_setter, HasSetter, Setter, SetterImpl};

struct Point { x: u32, y: u32 };

let mut s = Point { x: 1, y: 2 };
let setter = mapped_setter(|p: &mut Point, v| p.x = v);

setter.set(&mut s, 42);

assert_eq!(s.x, 42);