StructureSwift
EmptyCollection
A collection whose element type is Element but that is always empty.
@frozen struct EmptyCollection<Element>Members
Typealiases
typealias IndexA type that represents a valid position in the collection.
typealias IndicesA type that represents the indices that are valid for subscripting the collection, in ascending order.
typealias SubSequenceA collection representing a contiguous subrange of this collection’s elements. The subsequence shares indices with the original collection.
Initializers
init()Creates an instance.
Instance Subscripts
subscript<R>(R) -> Self.SubSequenceAccesses the contiguous subrange of the collection’s elements specified by a range expression.
subscript((UnboundedRange_) -> ()) -> Self.SubSequencesubscript(Range<EmptyCollection<Element>.Index>) -> EmptyCollection<Element>.SubSequenceAccesses a contiguous subrange of the collection’s elements.
subscript(EmptyCollection<Element>.Index) -> ElementAccesses the element at the given position.
subscript<R>(R) -> Self.SubSequence<unavailable>subscript((UnboundedRange_) -> ()) -> Self.SubSequence<unavailable>
Instance Properties
var count: IntThe number of elements in the collection.
var count: IntThe number of elements (always zero).
var endIndex: EmptyCollection<Element>.IndexAlways zero, just like
startIndex.var first: Self.Element?The first element of the collection.
var isEmpty: BoolA Boolean value indicating whether the collection is empty.
var last: Self.Element?The last element of the collection.
var lazy: LazySequence<Self>A sequence containing the same elements as this sequence, but on which some operations, such as
mapandfilter, are implemented lazily.var startIndex: EmptyCollection<Element>.IndexAlways zero, just like
endIndex.var underestimatedCount: IntA value less than or equal to the number of elements in the collection.
var underestimatedCount: IntA value less than or equal to the number of elements in the sequence, calculated nondestructively.
Foundation
var regions: EmptyCollection<Data>A
BidirectionalCollectionofDataProtocolelements which compose a discontiguous buffer of memory. Each region is a contiguous buffer of bytes.
Instance Methods
func allSatisfy((Self.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether every element of a sequence satisfies a given predicate.
func compactMap<ElementOfResult>((Self.Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult]Returns an array containing the non-
nilresults of calling the given transformation with each element of this sequence.func contains(Self.Element) -> BoolReturns a Boolean value indicating whether the sequence contains the given element.
func contains(where: (Self.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.
func difference<C>(from: C) -> CollectionDifference<Self.Element>Returns the difference needed to produce this collection’s ordered elements from the given collection.
func difference<C>(from: C, by: (C.Element, Self.Element) -> Bool) -> CollectionDifference<Self.Element>Returns the difference needed to produce this collection’s ordered elements from the given collection, using the given predicate as an equivalence test.
func distance(from: EmptyCollection<Element>.Index, to: EmptyCollection<Element>.Index) -> IntThe distance between two indexes (always zero).
func drop(while: (Self.Element) throws -> Bool) rethrows -> Self.SubSequenceReturns a subsequence by skipping elements while
predicatereturnstrueand returning the remaining elements.func dropFirst(Int) -> Self.SubSequenceReturns a subsequence containing all but the given number of initial elements.
func dropLast(Int) -> Self.SubSequenceReturns a subsequence containing all but the specified number of final elements.
func elementsEqual<OtherSequence>(OtherSequence) -> BoolReturns a Boolean value indicating whether this sequence and another sequence contain the same elements in the same order.
func elementsEqual<OtherSequence>(OtherSequence, by: (Self.Element, OtherSequence.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether this sequence and another sequence contain equivalent elements in the same order, using the given predicate as the equivalence test.
func enumerated() -> EnumeratedSequence<Self>Returns a sequence of pairs (n, x), where n represents a consecutive integer starting at zero and x represents an element of the sequence.
func filter((Self.Element) throws -> Bool) rethrows -> [Self.Element]Returns an array containing, in order, the elements of the sequence that satisfy the given predicate.
func first(where: (Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the first element of the sequence that satisfies the given predicate.
func firstIndex(of: Self.Element) -> Self.Index?Returns the first index where the specified value appears in the collection.
func firstIndex(where: (Self.Element) throws -> Bool) rethrows -> Self.Index?Returns the first index in which an element of the collection satisfies the given predicate.
func flatMap<SegmentOfResult>((Self.Element) throws -> SegmentOfResult) rethrows -> [SegmentOfResult.Element]Returns an array containing the concatenated results of calling the given transformation with each element of this sequence.
func forEach((Self.Element) throws -> Void) rethrowsCalls the given closure on each element in the sequence in the same order as a
for-inloop.func formIndex(inout Self.Index, offsetBy: Int)Offsets the given index by the specified distance.
func formIndex(inout Self.Index, offsetBy: Int, limitedBy: Self.Index) -> BoolOffsets the given index by the specified distance, or so that it equals the given limiting index.
func formIndex(after: inout Self.Index)Replaces the given index with its successor.
func formIndex(before: inout Self.Index)Replaces the given index with its predecessor.
func index(EmptyCollection<Element>.Index, offsetBy: Int) -> EmptyCollection<Element>.IndexReturns an index that is the specified distance from the given index.
func index(EmptyCollection<Element>.Index, offsetBy: Int, limitedBy: EmptyCollection<Element>.Index) -> EmptyCollection<Element>.Index?Returns an index that is the specified distance from the given index, unless that distance is beyond a given limiting index.
func index(after: EmptyCollection<Element>.Index) -> EmptyCollection<Element>.IndexAlways traps.
func index(before: EmptyCollection<Element>.Index) -> EmptyCollection<Element>.IndexAlways traps.
func joined() -> FlattenSequence<Self>Returns the elements of this sequence of sequences, concatenated.
func joined(separator: String) -> StringReturns a new string by concatenating the elements of the sequence, adding the given separator between each element.
func joined<Separator>(separator: Separator) -> JoinedSequence<Self>Returns the concatenated elements of this sequence of sequences, inserting the given separator between each element.
func joined(separator: String) -> StringReturns a new string by concatenating the elements of the sequence, adding the given separator between each element.
func last(where: (Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the last element of the sequence that satisfies the given predicate.
func lastIndex(of: Self.Element) -> Self.Index?Returns the last index where the specified value appears in the collection.
func lastIndex(where: (Self.Element) throws -> Bool) rethrows -> Self.Index?Returns the index of the last element in the collection that matches the given predicate.
func lexicographicallyPrecedes<OtherSequence>(OtherSequence) -> BoolReturns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the less-than operator (
<) to compare elements.func lexicographicallyPrecedes<OtherSequence>(OtherSequence, by: (Self.Element, Self.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the given predicate to compare elements.
func makeIterator() -> EmptyCollection<Element>.IteratorReturns an empty iterator.
func map<T>((Self.Element) throws -> T) rethrows -> [T]Returns an array containing the results of mapping the given closure over the sequence’s elements.
func map<T>((Self.Element) throws -> T) rethrows -> [T]Returns an array containing the results of mapping the given closure over the sequence’s elements.
func max() -> Self.Element?Returns the maximum element in the sequence.
func max(by: (Self.Element, Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the maximum element in the sequence, using the given predicate as the comparison between elements.
func min() -> Self.Element?Returns the minimum element in the sequence.
func min(by: (Self.Element, Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the minimum element in the sequence, using the given predicate as the comparison between elements.
func partition(by: (Self.Element) throws -> Bool) rethrows -> Self.IndexReorders the elements of the collection such that all the elements that match the given predicate are after all the elements that don’t match.
func partition(by: (Self.Element) throws -> Bool) rethrows -> Self.IndexReorders the elements of the collection such that all the elements that match the given predicate are after all the elements that don’t match.
func popFirst() -> Self.Element?Removes and returns the first element of the collection.
func popLast() -> Self.Element?Removes and returns the last element of the collection.
func prefix(Int) -> Self.SubSequenceReturns a subsequence, up to the specified maximum length, containing the initial elements of the collection.
func prefix(through: Self.Index) -> Self.SubSequenceReturns a subsequence from the start of the collection through the specified position.
func prefix(upTo: Self.Index) -> Self.SubSequenceReturns a subsequence from the start of the collection up to, but not including, the specified position.
func prefix(while: (Self.Element) throws -> Bool) rethrows -> Self.SubSequenceReturns a subsequence containing the initial elements until
predicatereturnsfalseand skipping the remaining elements.func randomElement() -> Self.Element?Returns a random element of the collection.
func randomElement<T>(using: inout T) -> Self.Element?Returns a random element of the collection, using the given generator as a source for randomness.
func reduce<Result>(Result, (Result, Self.Element) throws -> Result) rethrows -> ResultReturns the result of combining the elements of the sequence using the given closure.
func reduce<Result>(into: Result, (inout Result, Self.Element) throws -> ()) rethrows -> ResultReturns the result of combining the elements of the sequence using the given closure.
func removeFirst() -> Self.ElementRemoves and returns the first element of the collection.
func removeFirst(Int)Removes the specified number of elements from the beginning of the collection.
func removeLast() -> Self.ElementRemoves and returns the last element of the collection.
func removeLast(Int)Removes the given number of elements from the end of the collection.
func reverse()Reverses the elements of the collection in place.
func reversed() -> ReversedCollection<Self>Returns a view presenting the elements of the collection in reverse order.
func shuffle()Shuffles the collection in place.
func shuffle<T>(using: inout T)Shuffles the collection in place, using the given generator as a source for randomness.
func shuffled() -> [Self.Element]Returns the elements of the sequence, shuffled.
func shuffled<T>(using: inout T) -> [Self.Element]Returns the elements of the sequence, shuffled using the given generator as a source for randomness.
func sort()Sorts the collection in place.
func sort(by: (Self.Element, Self.Element) throws -> Bool) rethrowsSorts the collection in place, using the given predicate as the comparison between elements.
func sorted() -> [Self.Element]Returns the elements of the sequence, sorted.
func sorted(by: (Self.Element, Self.Element) throws -> Bool) rethrows -> [Self.Element]Returns the elements of the sequence, sorted using the given predicate as the comparison between elements.
func split(maxSplits: Int, omittingEmptySubsequences: Bool, whereSeparator: (Self.Element) throws -> Bool) rethrows -> [Self.SubSequence]Returns the longest possible subsequences of the collection, in order, that don’t contain elements satisfying the given predicate.
func split(separator: Self.Element, maxSplits: Int, omittingEmptySubsequences: Bool) -> [Self.SubSequence]Returns the longest possible subsequences of the collection, in order, around elements equal to the given element.
func split(separator: Self.Element, maxSplits: Int, omittingEmptySubsequences: Bool) -> [ArraySlice<Self.Element>]Returns the longest possible subsequences of the sequence, in order, around elements equal to the given element.
func starts<PossiblePrefix>(with: PossiblePrefix) -> BoolReturns a Boolean value indicating whether the initial elements of the sequence are the same as the elements in another sequence.
func starts<PossiblePrefix>(with: PossiblePrefix, by: (Self.Element, PossiblePrefix.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether the initial elements of the sequence are equivalent to the elements in another sequence, using the given predicate as the equivalence test.
func suffix(Int) -> Self.SubSequenceReturns a subsequence, up to the given maximum length, containing the final elements of the collection.
func suffix(from: Self.Index) -> Self.SubSequenceReturns a subsequence from the specified position to the end of the collection.
func swapAt(Self.Index, Self.Index)Exchanges the values at the specified indices of the collection.
func withContiguousMutableStorageIfAvailable<R>((inout UnsafeMutableBufferPointer<Self.Element>) throws -> R) rethrows -> R?Executes a closure on the collection’s contiguous storage.
func withContiguousStorageIfAvailable<R>((UnsafeBufferPointer<Self.Element>) throws -> R) rethrows -> R?Executes a closure on the sequence’s contiguous storage.
Foundation
func copyBytes<DestinationType>(to: UnsafeMutableBufferPointer<DestinationType>) -> Intfunc copyBytes(to: UnsafeMutableRawBufferPointer) -> Intfunc copyBytes<DestinationType>(to: UnsafeMutableBufferPointer<DestinationType>, count: Int) -> Intfunc copyBytes(to: UnsafeMutableRawBufferPointer, count: Int) -> Intfunc copyBytes<R>(to: UnsafeMutableRawBufferPointer, from: R) -> Intfunc copyBytes<DestinationType, R>(to: UnsafeMutableBufferPointer<DestinationType>, from: R) -> Intfunc copyBytes<DestinationType, R>(to: UnsafeMutableBufferPointer<DestinationType>, from: R)func firstRange<D>(of: D) -> Range<Self.Index>?func firstRange<D, R>(of: D, in: R) -> Range<Self.Index>?Returns the first found range of the given data buffer.
func lastRange<D>(of: D) -> Range<Self.Index>?func lastRange<D, R>(of: D, in: R) -> Range<Self.Index>?Returns the last found range of the given data buffer.
func withUnsafeBytes<R>((UnsafeRawBufferPointer) throws -> R) rethrows -> RCalls the given closure with the contents of underlying storage.
Type Operators
static func != (Self, Self) -> Boolstatic func == (EmptyCollection<Element>, EmptyCollection<Element>) -> BoolReturns a Boolean value indicating whether two values are equal.
Structures
struct IteratorAn iterator that never produces an element.
Removed Members
Instance Methods
func flatMap<ElementOfResult>((Self.Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult]func index(of: Self.Element) -> Self.Index?Returns the first index where the specified value appears in the collection.