Replaces the given index with its predecessor.
SDK
- Xcode 8.0+
Framework
- Swift Standard Library
Declaration
func formIndex(before i: inout Int)
Parameters
iA valid index of the collection.
imust be greater thanstart.Index
Instance Methodform
formIndex(before:)
Relationships
From Protocol
See Also
Manipulating Indices
var startIndex : IntThe position of the first element in a nonempty array.
var endIndex : IntThe array’s “past the end” position—that is, the position one greater than the last valid subscript argument.
func index(after: Int) -> IntReturns the position immediately after the given index.
func formIndex (after: inout Int)Replaces the given index with its successor.
func index(before: Int) -> IntReturns the position immediately before the given index.
func index(Int, offsetBy : Int) -> IntReturns an index that is the specified distance from the given index.
func formIndex (inout Int, offsetBy : Int)Offsets the given index by the specified distance.
func index(Int, offsetBy : Int, limitedBy : Int) -> Int?Returns an index that is the specified distance from the given index, unless that distance is beyond a given limiting index.
func formIndex (inout Int, offsetBy : Int, limitedBy : Int) -> BoolOffsets the given index by the specified distance, or so that it equals the given limiting index.
func distance(from: Int, to: Int) -> IntReturns the distance between two indices.
var indices: Range<Int>The indices that are valid for subscripting the collection, in ascending order.