pub trait RefLiftFn: CloneFn<Ref> {
// Required method
fn ref_new<'a, A: 'a, B: 'a>(
f: impl 'a + Fn(&A) -> B,
) -> <Self as CloneFn<Ref>>::Of<'a, A, B>;
}Expand description
A trait for constructing Ref-mode cloneable function wrappers from closures.
This mirrors LiftFn but for by-reference closures (Fn(&A) -> B).
Required Methods§
Sourcefn ref_new<'a, A: 'a, B: 'a>(
f: impl 'a + Fn(&A) -> B,
) -> <Self as CloneFn<Ref>>::Of<'a, A, B>
fn ref_new<'a, A: 'a, B: 'a>( f: impl 'a + Fn(&A) -> B, ) -> <Self as CloneFn<Ref>>::Of<'a, A, B>
Creates a new cloneable by-reference function wrapper.
This function wraps the provided closure f (which takes &A)
into a cloneable function.
§Type Signature
forall A B. (&A -> B) -> Self A B
§Type Parameters
'a: The lifetime of the function and its captured data.A: The input type (the closure receives&A).B: The output type of the function.
§Parameters
f: The by-reference closure to wrap.
§Returns
The wrapped cloneable by-reference function.
§Examples
use fp_library::{
brands::*,
functions::*,
};
let f = ref_lift_fn_new::<RcFnBrand, _, _>(|x: &i32| *x * 2);
assert_eq!(f(&5), 10);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.