Swift Class versus Structure

In Swift Just like classes play a important role , Structure do play a important role.

What could be the notable difference?
First one is Structure is pass by value and Classes are pass by reference.  Below is a simple example to understand the meaning of it.

func getAddress(_ object: Any)->String{

    var newObject = object

    var address:String = String("Could Not CalculateAddress")

    withUnsafePointer(to: &newObject) {

        

        address = "\($0)"

    }

    return address

}

func getAddressForClass(_ object:AnyObject) -> Any {

    return Unmanaged<AnyObject>.passUnretained(object).toOpaque()

}

//Structure

struct User{

    var name:String

    var userId:Int

}

func changeStructuredValue(_ inputStruct:User){

    var newInputStruct = inputStruct

    newInputStruct.name =  "Rose"

    print("Modifying Struct , Address Location= \(getAddress(newInputStruct))")

}

var structUser = User(name: "John", userId: 1)

print("Original Structure = \(structUser) Address Location= \(getAddress(structUser))")

changeStructuredValue(structUser)

print("Modified Structure = \(structUser) Address Location= \(getAddress(structUser))")

print("\n\n")

///Class

class Person {

    var personName : String?

    var personId   : Int?

}

func changeClassValue(_ inputPerson: Person){

    inputPerson.personName = "Eddie"

    print("Modifying Class Address Location= \(getAddressForClass(inputPerson))")

}

var person = Person()

person.personName = "ED"

person.personId = 189

print("Original Class = \(person.personName) Address Location= \(getAddressForClass(person))")

changeClassValue(person)

print("Modified Class = \(person.personName) Address Location= \(getAddressForClass(person))")

-------The output of the above code would be--------------

Original Structure = User(name: "John", userId: 1) Address Location= 0x00007fff5f2af048

Modifying Struct , Address Location= 0x00007fff5f2aef58

Modified Structure = User(name: "John", userId: 1) Address Location= 0x00007fff5f2af048

Original Class = Optional("ED") Address Location= 0x0000618000072500

Modifying Class Address Location= 0x0000618000072500

Modified Class = Optional("Eddie") Address Location= 0x0000618000072500

You might have noticed , changeStructuredValue does change the value and is local to the scope. It creates a new copy for the function changeStructuredValue.

On the other side for the class the address remains the same before and after the modifying the value.

This was small example , that could help understanding this concept. Please write in your comments for any further feedback.