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// RUN: not %target-swift-frontend %s -typecheck
public protocol Q_SequenceDefaults {
typealias Element
typealias Iterator : IteratorProtocol
func makeIterator() -> Iterator
}
extension Q_SequenceDefaults {
public final var underestimatedCount: Int { return 0 }
public final func preprocessingPass<R>(body: (Self)->R) -> R? {
return nil
}
/// Create a ContiguousArray containing the elements of `self`,
/// in the same order.
public final func copyToContiguousArray() -> ContiguousArray<Iterator.Element> {
let initialCapacity = underestimatedCount
var result = _ContiguousArrayBuffer<Iterator.Element>(
count: initialCapacity, minimumCapacity: 0)
var iter = self.makeIterator()
while let x = iter.next() {
result += CollectionOfOne(x)
}
return ContiguousArray(result)
}
/// Initialize the storage at baseAddress with the contents of this
/// sequence.
public final func initializeRawMemory(
baseAddress: UnsafeMutablePointer<Iterator.Element>
) {
var p = baseAddress
var iter = self.makeIterator()
while let element = iter.next() {
p.initialize(to: element)
p += 1
}
}
public final static func _constrainElement(Iterator.Element) {}
}
/// A type that can be iterated with a `for`\ ...\ `in` loop.
///
/// `Sequence` makes no requirement on conforming types regarding
/// whether they will be destructively "consumed" by iteration. To
/// ensure non-destructive iteration, constrain your *sequence* to
/// `Collection`.
public protocol Q_Sequence : Q_SequenceDefaults {
/// A type that provides the *sequence*\ 's iteration interface and
/// encapsulates its iteration state.
typealias Iterator : IteratorProtocol
func makeIterator() -> Iterator
/// Return a value less than or equal to the number of elements in
/// self, **nondestructively**.
///
/// Complexity: O(N)
var underestimatedCount: Int
/// If `self` is multi-pass (i.e., a `Collection`), invoke the function
/// on `self` and return its result. Otherwise, return `nil`.
func preprocessingPass<R>(body: (Self)->R) -> R?
/// Create a ContiguousArray containing the elements of `self`,
/// in the same order.
func copyToContiguousArray() -> ContiguousArray<Element>
/// Initialize the storage at baseAddress with the contents of this
/// sequence.
func initializeRawMemory(
baseAddress: UnsafeMutablePointer<Element>
)
static func _constrainElement(Element)
}
public extension IteratorProtocol {
// typealias Iterator = Self
public final func makeIterator() -> Self {
return self
}
}
public protocol Q_Indexable {
typealias Index : ForwardIndex
typealias Element
subscript(position: Index) -> Element {get}
var startIndex: Index {get}
var endIndex: Index {get}
}
public protocol Q_CollectionDefaults : Q_Sequence, Q_Indexable {
}
extension Q_CollectionDefaults {
public final func count() -> Index.Distance {
return distance(startIndex, endIndex)
}
public final var underestimatedCount: Int {
let n = count().toIntMax()
return n > IntMax(Int.max) ? Int.max : Int(n)
}
public final func preprocessingPass<R>(body: (Self)->R) -> R? {
return body(self)
}
public final func makeIterator() -> Q_IndexingIterator<Boo> {
return Q_IndexingIterator(pos: self.startIndex, elements: self)
}
}
public struct Q_IndexingIterator<C: Q_Indexable> : IteratorProtocol {
public typealias Element = C.Element
var pos: C.Index
let elements: C
public mutating func next() -> C.Element? {
if pos == elements.endIndex {
return nil
}
let ret = elements[pos]
pos += 1
return ret
}
}
public protocol Q_Collection : Q_CollectionDefaults {
func count() -> Index.Distance
subscript(position: Index) -> Element {get}
}
extension Array : Q_Collection {
public func copyToContiguousArray() -> ContiguousArray<Element> {
return ContiguousArray(self~>_copyToNativeArrayBuffer())
}
}
struct Boo : Q_Collection {
let startIndex: Int = 0
let endIndex: Int = 10
subscript(i: Int) -> String {
return "Boo"
}
func makeIterator() -> Q_IndexingIterator<Boo> {
return Q_IndexingIterator(pos: self.startIndex, elements: self)
}
}
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