kotlin using data class generics type

user_1217187 0
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Hi there I have gone thru the kotlin documentation and haven't found anything. What I want to do is have a generic thar must be a data class, something like

data class MyData(val pop1:Long,val pop2:String,...)

fun class MyGenericClass<T : isDataClass>(o : T){
    // This is the important part
    fun useCopy(value : Long) = t.copy(pop1 = value)
}

What I really need to achieve is to be able to use the copy function of data classes in a generic way(pop1 will always be a member of my data classes)

Thanks in advance

kotlin
1 Answers

You should consider using an interface for that particular problem. Just delegate to the data class copy in the implementation.

data class MyData(val pop1: Long, val pop2: String) : Pop1Data {
    override fun copy(pop1: Long) {
        copy(pop1 = pop)
    }
}

interface Pop1Data {
    fun copy(pop1: Long)
}

class MyGenericClass<T : Pop1Data>(private val o: T) {
    // This is the important part
    fun useCopy(value: Long) = o.copy(value)
}
user_80736520
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