In MPAndroidChart library there are

public class LineChart extends BarLineChartBase<LineData>

and

public class BarChart extends BarLineChartBase<BarData>

. How to write an extension function

fun BarLineChartBase<what_to_insert_here?>.applyDefaultChartProperties()

on

BarLineChartBase

? Or how to write a function which accepts

BarLineChartBase

as parameter?

fun <T: BaseOfBarDataOrLineDataPreferably>  BarLineChartBase<T>.applyDefaultChartProperties()

?

What is

BaseOfBarDataOrLineDataPreferably

?

base class/interface from library

It's crazy, too much for me 😬

public abstract class BarLineChartBase<T extends BarLineScatterCandleBubbleData<? extends IBarLineScatterCandleBubbleDataSet<? extends Entry>>> extends Chart<T> implements BarLineScatterCandleBubbleDataProvider