class ClassEqual: Equatable {
    var name = "Saurav"
    static func == (lhs: ClassEqual, rhs: ClassEqual) -> Bool {
        return lhs.name == rhs.name
    }
}

let a = ClassEqual()
let a1 = ClassEqual()
a1.name = "X"
print("a and a1 have same value: \(a == a1)")
// OUTPUT
"a and a1 have same value: \(a == a1)" false