Function differential_dataflow::algorithms::prefix_sum::broadcast

pub fn broadcast<G, K, D, F>(
    ranges: Collection<G, ((usize, usize, K), D)>, 
    queries: Collection<G, (usize, K)>, 
    zero: D, 
    combine: F
) -> Collection<G, ((usize, K), D)> where
    G: Scope,
    G::Timestamp: Lattice + Ord + Debug,
    K: ExchangeData + Hash,
    D: ExchangeData + Hash,
    F: Fn(&K, &D, &D) -> D + 'static, 

Produces the accumulated values at each of the usize locations in queries.