swift 打印引用类型地址，值类型地址

swift 5.x 版本

struct PersonS {
}

class Friend: CustomStringConvertible{
    var name: String = "Friend"
    var description: String {
        return "name = \(name)"
    }
}

class Person: CustomStringConvertible {
    var age: Int = 20
    var friend: Friend = Friend()
    
    var description: String {
        return "age = \(age) friend: + \(friend.description)"
    }
}

let lee = Person()
lee.friend.name = "lee"
let han = lee
han.friend.name = "lee"
han.age = 21

print(lee)
print(han)

var ps = PersonS()
// 引用类型
print(Unmanaged.passUnretained(han).toOpaque()) //打印引用类型
print(Unmanaged.passUnretained(lee).toOpaque()) //打印引用类型
print(UnsafePointer(&ps)) //打印地址 值类型

//ObjectIdentifier 支持实例，元类型，不支持 enum， struct，func，tuple
print(ObjectIdentifier(Person.self)) // 打印 元类型
print(ObjectIdentifier(han)) // 打印 对象实例
print(ObjectIdentifier(han.self)) // 打印 对象实例