Scala - implicit conversion of Int to Numeric[Int]

Question

I\'ve created a class that can be parameterised by anything that can be converted to Numeric

class Complex[T <% Numeric[T]] (val real : T, val imag : T) {         


        

Answer 1

You are using it wrong. The correct usage is like this:

class Complex[T](val real : T, val imag : T)(implicit num: Numeric[T]) {
   import num._ // make implicit conversions available
   //... complex number methods ...
}

It is the same difference as in between Ordered and Ordering. An Ordered[T] instance can be compared to T, while an Ordering[T] provides a method that compares a a couple of T.