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Generalize Vertex construction to arbitrary sequences.

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This commit is contained in:
Rob Rix 2015-09-25 11:57:53 -04:00
parent ece5c942d5
commit 8178904a36
1 changed files with 4 additions and 2 deletions
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6
prototype/Doubt/Vertex.swift
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@ -34,10 +34,12 @@ public enum Vertex<Element> {
}
public init<A, B>(rows: Stream<A>, columns: Stream<B>, combine: (A, B) -> Element) {
public init<S1: SequenceType, S2: SequenceType>(rows: S1, columns: S2, combine: (S1.Generator.Element, S2.Generator.Element) -> Element) {
let rows = Stream(sequence: rows)
let columns = Stream(sequence: columns)
self = columns
.map { b in rows.map { a in (a, b) } }
.fold(Vertex<(A, B)>.End) {
.fold(Vertex<(S1.Generator.Element, S2.Generator.Element)>.End) {
$0.fold(($1, .End)) {
($1.flatMap { row, _ in row }.flatMap { $0.right }, .XY($0, $1.map { _, column in column }, $1.flatMap { row, _ in row }))
}.1