Class中的ObjectIdentifier

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ObjectIdentifier：用来判断类的标识，只要类实例、元类中才能使用。

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class Student {
}

let stuA = Student()
let stuB = stuA

// true
print(ObjectIdentifier(stuA) == ObjectIdentifier(stuB))
// true
print(stuA === stuB)


let stuC = Student()
// false
print(ObjectIdentifier(stuA) == ObjectIdentifier(stuC))
// false
print(stuA === stuC)