Michael Ilseman milseman
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| prefix operator ^ | |
| public prefix func ^<T>(_ t: T) -> T? { return .some(t) } | |
| // | |
| // Numbers | |
| // |
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| precedencegroup RelativeOffsetPrecedence { | |
| higherThan: RangeFormationPrecedence | |
| } | |
| infix operator ++ : RelativeOffsetPrecedence | |
| infix operator -- : RelativeOffsetPrecedence | |
| extension Collection { | |
| internal func _clampedIndex(_ idx: Index, offsetBy offset: Int) -> Index { | |
| let limit = offset < 0 ? startIndex : endIndex |
milseman
/ offset_indexing_arrow_operator.swift
Created
April 30, 2019 20:41
Offset Indexing, with arrow operators instead
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| precedencegroup RelativeOffsetPrecedence { | |
| higherThan: RangeFormationPrecedence | |
| } | |
| infix operator --> : RelativeOffsetPrecedence | |
| infix operator <-- : RelativeOffsetPrecedence | |
| prefix operator --> | |
| postfix operator <-- | |
| extension Collection { |
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| // TODO: doc | |
| public struct OffsetBound { | |
| internal enum Kind { | |
| case fromStart(Int) | |
| case fromEnd(Int) | |
| } | |
| internal var kind: Kind | |
| init(fromStart: Int) { | |
| self.kind = .fromStart(fromStart) |
milseman
/ offset_indexing_phantom_xwu.swift
Last active
May 3, 2019 00:21
Offset Indexing, using phantom-typed OffsetRange
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| // TODO: doc | |
| public struct OffsetBound<Bound> { | |
| internal enum Kind { | |
| case fromStart(Int) | |
| case fromEnd(Int) | |
| } | |
| internal var kind: Kind | |
| public init(fromStart: Int) { | |
| self.kind = .fromStart(fromStart) |
milseman
/ offset_indexing_no_range.swift
Created
May 3, 2019 21:28
Offset Indexing, only OffsetBound
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| // TODO: doc | |
| public struct OffsetBound { | |
| internal enum Kind { | |
| case fromStart(Int) | |
| case fromEnd(Int) | |
| } | |
| internal var kind: Kind | |
| public init(fromStart: Int) { | |
| self.kind = .fromStart(fromStart) |
milseman
/ offset_no_range_phantom.swift
Created
May 3, 2019 22:25
Broken: Offset Indexing, Existing ranges, Phantom typed
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| // TODO: doc | |
| public struct OffsetBound<Bound> { | |
| internal enum Kind { | |
| case fromStart(Int) | |
| case fromEnd(Int) | |
| } | |
| internal var kind: Kind | |
| public init(fromStart: Int) { | |
| self.kind = .fromStart(fromStart) |
milseman
/ offset_no_range_explicit_end.swift
Created
May 6, 2019 19:25
Offset Indexing, no range, explicit end
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| // TODO: doc | |
| public struct OffsetBound { | |
| internal enum Kind { | |
| case fromStart(Int) | |
| case fromEnd(Int) | |
| } | |
| internal var kind: Kind | |
| internal init(fromStart: Int) { | |
| self.kind = .fromStart(fromStart) |
milseman
/ offset_no_range_no_label.swift
Last active
May 6, 2019 21:00
Offset indexing, no range, no label
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| // TODO: doc | |
| public struct OffsetBound { | |
| internal enum Kind { | |
| case fromStart(Int) | |
| case fromEnd(Int) | |
| } | |
| internal var kind: Kind | |
| internal init(fromStart: Int) { | |
| self.kind = .fromStart(fromStart) |
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| // The below will be a customization point on Collection. For the purposes of | |
| // this gist, we'll fake/approximate it with static overloads | |
| extension Collection { | |
| /// Returns an index `distance` positions prior to `i` if it exists. | |
| /// | |
| /// Other methods such as `index(_:offetBy:)` must not be passed a negative | |
| /// offset if the collection is bidirectional. This method will perform a | |
| /// negative offset even if the collection is not bidirectional, by using a | |
| /// less efficient means. `BidirectionalCollection` customizes this with a |