Contributed by Lorenzobattistelaopen in new window

StringRef

Represent a constant reference to a string, i.e. a sequence of characters and a length, which need not be null terminated.

init

var x = StringRef("a")
print(x)

a

Or specifying the pointer

let x = "string"
let ptr = x.data()
let str_ref = StringRef(ptr)
print(str_ref)

string

let x = "string_2"
let ptr = x.data()
let length = len(x)

let str_ref = StringRef(ptr, length)
print(str_ref.length)
print(str_ref)

8
string_2

fields

data: A pointer to the beginning of the string data being referenced. length: The length of the string being referenced.

var a : StringRef = StringRef("a")
print(a.data)
print(a.length)

a
1

getitem

Get the string value at the specified position. It receives the index of the character to get. You can use the brackets notation to get the character at the specified position.

var x = StringRef("hello")
print(x.__getitem__(0))
print(x[1])

h
e

equal

Compares two strings are equal.

var x = StringRef("hello")
var y = StringRef("hello")
print(x.__eq__(y))
print(x == y)

True
True

not equal

Compares two strings are not equal.

var x = StringRef("hello")
var y = StringRef("hello")
print(x.__ne__(y))
print(x != y)

False
False

length

Returns the length of the string.

var x = StringRef("hello")
print(x.__len__())
print(len(x))

5
5