430 // Abstract idea:

   431 // In that version implicit conversions were used to solve the 

   432 // late extension problem; namely, given a class C and a class T, 

   433 // how to have C extend T without touching or recompiling C. 

   434 // Conversions add a wrapper when a member of T is requested 

   435 // from an instance of C.

   436 

   437 //Another example

   438 

   439 case class Duration(time: Long, unit: TimeUnit) {

   440   def +(o: Duration) = Duration(time + unit.convert(o.time, o.unit), unit)

   441 }

   442 

   443 implicit class Int2Duration(that: Int) {

   444   def seconds = new Duration(that, SECONDS)

   445   def minutes = new Duration(that, MINUTES)

   446 }

   447 

   448 5.seconds + 2.minutes //Duration(125L, SECONDS )

   449 

   450