can someone help me with generics? lets say I already overload

Number

operators and now I want make generics

Point

that will also overload operators based on

Number

, f.e result of

Point<Float> + Point<Float>

should be

Point<Float>

but recently is

Point<in Float>

:<

data class Point<Unit : Number>(val x: Unit, val y: Unit, val z: Unit) {
  operator fun plus(increment: Point<Unit>): Point<in Unit> {
    return Point(x + increment.x, y + increment.y, z + increment.z)
  }

  operator fun minus(increment: Point<Unit>): Point<in Unit> {
    return Point(x - increment.x, y - increment.y, z - increment.z)
  }

  operator fun times(increment: Point<Unit>): Point<in Unit> {
    return Point(x * increment.x, y * increment.y, z * increment.z)
  }

  operator fun div(increment: Point<Unit>): Point<in Unit> {
    return Point(x / increment.x, y / increment.y, z / increment.z)
  }
}

That's the type you're indicating expressly to be returned by your operators. Remove

in

from the type declarations and it should work.

then it will return Point<Number> not an Point<Float>

It will return Point<Unit> as indicated

I guess it would also depend on how you defined the Number operators