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Row-/column-major streams of vertices.

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This commit is contained in:
Rob Rix 2015-09-25 12:38:11 -04:00
parent 652d1f9db4
commit 98e66acdbf
1 changed files with 17 additions and 0 deletions
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17
prototype/Doubt/Vertex.swift
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@ -50,6 +50,23 @@ public enum Vertex<Element> {
}
}
public var rowMajor: Stream<Stream<Element>> {
return Stream.unfold(Memo(evaluated: self), { (state: Memo<Vertex>) -> (Stream<Element>, Memo<Vertex>)? in
state.value.analysis(
ifXY: { _, _, down in (state.value.row, down) },
ifEnd: const(nil))
})
}
public var columnMajor: Stream<Stream<Element>> {
return Stream.unfold(Memo(evaluated: self), { (state: Memo<Vertex>) -> (Stream<Element>, Memo<Vertex>)? in
state.value.analysis(
ifXY: { _, across, _ in (state.value.column, across) },
ifEnd: const(nil))
})
}
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)