tek/crates/tek_layout/src/map_reduce.rs

use crate::*;

impl<E: Engine> LayoutMapReduce<E> for E {}

pub trait LayoutMapReduce<E: Engine> {
    fn map <T, I, R, F> (iterator: I, callback: F) -> Map<E, T, I, R, F>
    where
        I: Iterator<Item=T>,
        R: Render<E>,
        F: Fn(T)->R
    {
        Map(Default::default(), iterator, callback)
    }
    fn reduce <T, I, R, F> (iterator: I, callback: F) -> Reduce<E, T, I, R, F>
    where
        I: Iterator<Item=T>,
        R: Render<E>,
        F: Fn(R, T)->R
    {
        Reduce(Default::default(), iterator, callback)
    }
}

pub struct Map<E: Engine, T, I: Iterator<Item=T>, R: Render<E>, F: Fn(T)->R>(
    PhantomData<E>,
    I,
    F
);

pub struct Reduce<E: Engine, T, I: Iterator<Item=T>, R: Render<E>, F: Fn(R, T)->R>(
    PhantomData<(E, R)>,
    I,
    F
);