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func SequenceType.enumerate() => var SequenceType.enumerated

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This commit is contained in:
Dmitri Gribenko
2015-11-04 10:29:41 -08:00
committed by Max Moiseev
parent 09a6913622
commit d72b5ab575
10 changed files with 40 additions and 44 deletions
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33
stdlib/public/core/Algorithm.swift
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@@ -66,25 +66,21 @@ public func max<T : Comparable>(x: T, _ y: T, _ z: T, _ rest: T...) -> T {
return r
}
/// The `IteratorProtocol` for `EnumeratedSequence`. `EnumeratedIterator`
/// wraps a `Base` `IteratorProtocol` and yields successive `Int` values,
/// The iterator for `EnumeratedSequence`. `EnumeratedIterator`
/// wraps a `Base` iterator and yields successive `Int` values,
/// starting at zero, along with the elements of the underlying
/// `Base`:
///
/// var iterator = ["foo", "bar"].enumerate()
/// var iterator = ["foo", "bar"].enumerated.iterator()
/// iterator.next() // (0, "foo")
/// iterator.next() // (1, "bar")
/// iterator.next() // nil
///
/// - Note: Idiomatic usage is to call `enumerate` instead of
/// constructing an `EnumeratedIterator` directly.
public struct EnumeratedIterator<
Base : IteratorProtocol
> : IteratorProtocol, SequenceType {
/// The type of element returned by `next()`.
public typealias Element = (offset: Int, element: Base.Element)
var _base: Base
var _count: Int
internal var _base: Base
internal var _count: Int
/// Construct from a `Base` iterator.
internal init(_base: Base) {
@@ -92,6 +88,9 @@ public struct EnumeratedIterator<
self._count = 0
}
/// The type of element returned by `next()`.
public typealias Element = (offset: Int, element: Base.Element)
/// Advance to the next element and return it, or `nil` if no next
/// element exists.
///
@@ -102,16 +101,14 @@ public struct EnumeratedIterator<
}
}
/// The `SequenceType` returned by `enumerate()`. `EnumeratedSequence`
/// is a sequence of pairs (*n*, *x*), where *n*s are consecutive
/// `Int`s starting at zero, and *x*s are the elements of a `Base`
/// `SequenceType`:
/// The type of the `enumerated` property.
///
/// var s = EnumeratedSequence(["foo", "bar"])
/// `EnumeratedSequence` is a sequence of pairs (*n*, *x*), where *n*s
/// are consecutive `Int`s starting at zero, and *x*s are the elements
/// of a `Base` `SequenceType`:
///
/// var s = ["foo", "bar"].enumerated
/// Array(s) // [(0, "foo"), (1, "bar")]
///
/// - Note: Idiomatic usage is to call `enumerate` instead of
/// constructing an `EnumeratedSequence` directly.
public struct EnumeratedSequence<Base : SequenceType> : SequenceType {
internal var _base: Base