StructMutation.swift

//: Playground - noun: a place where people can play

struct User {
    var name: String
    
    init() {
        name = ""
    }
}

class UserProfile {
    
    var user: User = User() {
        didSet {
            print("didSet \(user.name)")
        }
    }
    
}

let userProfile = UserProfile()
var user = User()
userProfile.user = User()

userProfile.user.name = "First Update"
withUnsafePointer(to: &userProfile.user.name) {
    print("name has address: \($0)")
}

userProfile.user.name = "Second Update"
withUnsafePointer(to: &userProfile.user.name) {
    print("name has address: \($0)")
}