Index

A type that represents a position in the collection. コレクションの中のある位置を表す型。

Required. 必須。

Declaration 宣言 

associatedtype Index : Comparable where Self.Index == Self.Indices.Element, Self.Indices.Element == Self.Indices.Index, Self.Indices.Index == Self.SubSequence.Index, Self.SubSequence.Index == Self.Indices.Indices.Element, Self.Indices.Indices.Element == Self.Indices.Indices.Index, Self.Indices.Indices.Index == Self.SubSequence.Indices.Element, Self.SubSequence.Indices.Element == Self.SubSequence.Indices.Index, Self.SubSequence.Indices.Index == Self.Indices.Indices.Indices.Element, Self.Indices.Indices.Indices.Element == Self.Indices.Indices.Indices.Index, Self.Indices.Indices.Indices.Index == Self.SubSequence.Indices.Indices.Element, Self.SubSequence.Indices.Indices.Element == Self.SubSequence.Indices.Indices.Index, Self.SubSequence.Indices.Indices.Index == Self.SubSequence.Indices.Indices.Indices.Element, Self.SubSequence.Indices.Indices.Indices.Element == Self.SubSequence.Indices.Indices.Indices.Index

Discussion 解説

Valid indices consist of the position of every element and a “past the end” position that’s not valid for use as a subscript argument. 有効なインデックスは、各要素の位置、および添え字引数として使うのに有効でない“終わりを過ぎた”位置から成ります。