Abstract

  • Either is a sum type which holds either of two generic values.

    Example Usage

    let one = Either<String,Int>.left("one")
let two = Either<String,Int>.right(2)
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    Declaration

    Swift

    public enum Either<Left, Right>
    extension Either: Equatable where Left: Equatable, Right: Equatable

  • Implementation of Allen’s Interval Algebra.

    Background

    From Thomas A. Alspaugh:

    In 1983 James F. Allen published a paper in which he proposed thirteen basic relations between time intervals that are distinct, exhaustive, and qualitative.

    • Distinct because no pair of definite intervals can be related by more than one of the relationships
    • Exhaustive because any pair of definite intervals are described by one of the relations
    • Qualitative (rather than quantitative) because no numeric time spans are considered

    The naming conventions used in this implementation are those of Allen, refined by Krokhin et al..

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    Declaration

    Swift

    public enum IntervalRelation : InvertibleEnum