Can't call overloaded Java method from Scala generic method

Question

I am trying to wrap java.util.Array.binarySearch in a generic fashion in Scala, but the following code doesn't work:

 def binarySlice[T](minValue: T, array: Array[T]): Array[T] = {
   val i = java.util.Arrays.binarySearch(array, minValue)
   val idx = if (i > 0) i else -i - 1
   array.slice(idx, array.length)
 }

The error is: Cannot resolve overloaded method 'binarySearch' . What should I do to make this code work?

Answer 1

See: Scala replacement for Arrays.binarySearch :

def binarySlice[T <: AnyRef](minValue: T, array: Array[T]): Array[T] = {
   val i = java.util.Arrays.binarySearch(array.asInstanceOf[Array[AnyRef]], minValue)
   val idx = if (i > 0) i else -i - 1
   array.slice(idx, array.length)
 }

You can not use it for primitives. It is work-around for int:

scala> binarySlice[java.lang.Integer](3, Array(0,3,7,8))
res6: Array[Integer] = Array(3, 7, 8)