<kotlin - how to override hashcode> I have overrid...

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[user]

kotlin - how to override hashcode
I have overrided the equals method of a java object. (actually the objects in kotlin but its easily understood im just overriding the equals method). but now inorder to maintain the equals contract i should also override the hashcode method. but im not sure how to put in a implementation for hashcode that suits the equals method. here is what i have so far:

data class AddressModel(
var id_address: Int = 0,
var id_country: Int = 0,
) {

override fun equals(other:...