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Construct vertices in row-major order.

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This commit is contained in:
Rob Rix 2015-09-25 12:52:59 -04:00
parent a0edc9fe49
commit 00f1daa61a
1 changed files with 2 additions and 2 deletions
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4
prototype/Doubt/Vertex.swift
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@ -70,8 +70,8 @@ public enum Vertex<Element>: CustomDebugStringConvertible, CustomStringConvertib
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 combine(a, b) } }
self = rows
.map { a in columns.map { b in combine(a, b) } }
.fold(Vertex.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 }))