Trait Reducer 

pub trait Reducer<T, U> {
    // Required method
    fn apply(&self, acc: U, value: &T) -> U;
}

Trait for types that can be used as reducer functions.

Required Methods

fn apply(&self, acc: U, value: &T) -> U

Apply the reducer to the accumulator and value.

Implementors

impl<T, U, F> Reducer<T, U> for F

where F: Fn(U, &T) -> U,