pub trait Lens<S, A> {
// Required methods
fn get(s: &S) -> Option<&A>;
fn set(a: A, s: &S) -> S;
// Provided method
fn over(s: &S, f: &dyn Fn(Option<&A>) -> A) -> S { ... }
}
Required Methods§
Provided Methods§
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.