kotlin data class copy by reflection

DataObjCopy.kt

import org.junit.Assert
import org.junit.Test
import kotlin.reflect.KProperty

class DataClassTest {

    @Test
    fun copyObj() {
        val data= Data1(1, "b", Value(3))

        Assert.assertEquals( Data2(1,"b",Value(3)) , data.toData2())
        Assert.assertEquals(Data2(1, "b", Value(3)), copyDataObj<Data1, Data2>(data))
    }
}


inline fun <S: Any,reified T: Any> copyDataObj( source:S) :T {
    val sourceMap: Map<String, Any?> =
            source::class.members
                    .filter { it is KProperty }
                    .map { it.name to (it as KProperty).getter.call(source) }
                    .fold(mutableMapOf()) { acc, pair ->
                        acc[pair.first] = pair.second
                        acc
                    }

    val constructor = T::class.constructors.first()

    val args = constructor.parameters.fold( mutableListOf<Any?>()) { acc, param ->
        acc.add( sourceMap[param.name])
        acc
    }

    return constructor.call(*args.toTypedArray())
}

data class Value(val v:Int)

data class Data1( val a:Int, val b:String, val v:Value) {
    fun toData2() = Data2( a,b,v)
}

data class Data2( val a:Int, val b:String, val v:Value)