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[BETA] Swift 1.2 #47

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Feb 12, 2015
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[BETA] Swift 1.2 #47

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6f91eab
Remove the arbitrary element accessors.
robrix Feb 10, 2015
2ada377
Sure, whatever.
robrix Feb 10, 2015
9115973
This only works with Dictionary<K, V>.
robrix Feb 10, 2015
3e16b9a
DictionaryIndex is no longer bidi, so neither is MultisetIndex.
robrix Feb 10, 2015
7c6d23c
Remove Set and Unit and rename/remove tests.
robrix Feb 10, 2015
45365d1
Fix comment documentation references to Set.
robrix Feb 10, 2015
f1a59e8
Combine parameter has no external label.
robrix Feb 10, 2015
19ef97f
Correct a test for the context of flatMap.
robrix Feb 10, 2015
862ba48
if let where
robrix Feb 10, 2015
64ffcd5
We’ve removed Set.
robrix Feb 12, 2015
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12 changes: 6 additions & 6 deletions README.md
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Expand Up @@ -2,22 +2,22 @@

[![Build status](https://api.travis-ci.org/robrix/Set.svg)](https://travis-ci.org/robrix/Set)

This is a Swift microframework which implements a Dictionary-backed Set.
This is a Swift microframework which implements a Dictionary-backed Multiset.

## Use

```swift
// Union
Set(1, 2, 3) + Set(3, 4, 5) // == Set(1, 2, 3, 4, 5)
Multiset(1, 2, 3) + Multiset(3, 4, 5) // == Multiset(1, 2, 3, 3, 4, 5)

// Difference
Set(1, 2, 3) - Set(2, 3) // == Set(1)
Multiset(1, 2, 3) - Multiset(2, 3) // == Multiset(1)

// Intersection
Set(1, 2, 3) & Set(3, 4, 5) // == Set(3)
Multiset(1, 2, 3) & Multiset(3, 4, 5) // == Multiset(3)
```

See [`Set.swift`][Set.swift] for more details.
See [`Multiset.swift`][Multiset.swift] for more details.

## Integration

Expand All @@ -32,4 +32,4 @@ See [`Set.swift`][Set.swift] for more details.

- [Greg Titus wrote a Set in Swift which inspired this](https://twitter.com/gregtitus/status/476420154230726656).

[Set.swift]: https://github.com/robrix/Set/blob/master/Set/Set.swift
[Multiset.swift]: https://github.com/robrix/Set/blob/master/Set/Multiset.swift
66 changes: 21 additions & 45 deletions Set.xcodeproj/project.pbxproj
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Expand Up @@ -7,24 +7,16 @@
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Expand Down Expand Up @@ -61,20 +53,16 @@
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Expand Down Expand Up @@ -133,7 +121,7 @@
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Expand All @@ -144,9 +132,7 @@
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Expand Down Expand Up @@ -279,7 +263,7 @@
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Expand Down Expand Up @@ -363,9 +347,7 @@
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Expand All @@ -392,9 +372,7 @@
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Expand Down
39 changes: 12 additions & 27 deletions Set/Multiset.swift
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Expand Up @@ -4,13 +4,13 @@
public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCollectionType, Hashable, Printable, DebugPrintable {
// MARK: Constructors

/// Constructs a `Set` with the elements of `sequence`.
/// Constructs a `Multiset` with the elements of `sequence`.
public init<S: SequenceType where S.Generator.Element == Element>(_ sequence: S) {
self.init(values: [:])
extend(sequence)
}

/// Constructs a `Set` from a variadic parameter list.
/// Constructs a `Multiset` from a variadic parameter list.
public init(_ elements: Element...) {
self.init(elements)
}
Expand Down Expand Up @@ -56,25 +56,17 @@ public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCo
return values[element] ?? 0
}

/// Retrieve an arbitrary element & insert with empty subscript.
public subscript(v: ()) -> Element {
get { return values[values.startIndex].0 }
set { insert(newValue) }
}

/// Inserts `element` into the receiver.
public mutating func insert(element: Element) {
values[element] = (values[element] ?? 0) + 1
}

/// Removes `element` from the receiver.
public mutating func remove(element: Element) {
if let value = values[element] {
if value > 0 {
values[element] = value - 1
} else {
values.removeValueForKey(element)
}
if let value = values[element] where value > 0 {
values[element] = value - 1
} else {
values.removeValueForKey(element)
}
}

Expand Down Expand Up @@ -113,7 +105,7 @@ public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCo
}


// MARK: Set inclusion functions
// MARK: Inclusion functions

/// True iff the receiver is a subset of (is included in) `set`.
public func subset(set: Multiset) -> Bool {
Expand All @@ -136,7 +128,6 @@ public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCo
}



// MARK: Higher-order functions

/// Returns a new set including only those elements `x` where `includeElement(x)` is true.
Expand All @@ -155,7 +146,7 @@ public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCo
}

/// Combines each element of the receiver with an accumulator value using `combine`, starting with `initial`.
public func reduce<Into>(initial: Into, combine: (Into, Element) -> Into) -> Into {
public func reduce<Into>(initial: Into, _ combine: (Into, Element) -> Into) -> Into {
return Swift.reduce(self, initial, combine)
}

Expand Down Expand Up @@ -203,8 +194,6 @@ public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCo
let (element, count) = values[index.from]
if index.delta > (count - 1) {
return self[MultisetIndex(from: index.from.successor(), delta: index.delta - count, max: self.count)]
} else if index.delta < -(count - 1) {
return self[MultisetIndex(from: index.from.predecessor(), delta: index.delta + count, max: self.count)]
} else {
return element
}
Expand All @@ -224,7 +213,7 @@ public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCo
}
}

/// Appends `element` onto the `Set`.
/// Appends `element` onto the `Multiset`.
public mutating func append(element: Element) {
insert(element)
}
Expand Down Expand Up @@ -272,7 +261,7 @@ public struct Multiset<Element: Hashable>: ArrayLiteralConvertible, ExtensibleCo
}

/// Counts indexed by value.
private var values: [Element: Int]
private var values: Dictionary<Element, Int>
}


Expand Down Expand Up @@ -313,12 +302,8 @@ public func == <Element> (a: Multiset<Element>, b: Multiset<Element>) -> Bool {


/// The index for values of a multiset.
public struct MultisetIndex<Element: Hashable>: BidirectionalIndexType, Comparable {
// MARK: BidirectionalIndexType

public func predecessor() -> MultisetIndex {
return MultisetIndex(from: from, delta: delta - 1, max: max)
}
public struct MultisetIndex<Element: Hashable>: ForwardIndexType, Comparable {
// MARK: ForwardIndexType

public func successor() -> MultisetIndex {
return MultisetIndex(from: from, delta: delta + 1, max: max)
Expand Down
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