2.7.7 -> 2.8.0 changes

Anything creating an Array or calling something that creates an Array now needs a manifest. Just replace [A,B] with [A,B : Manifest], or add (implicit man: Manifest[B]).   By the way, 2.8's Range is strict.

On Tue, Apr 6, 2010 at 2:57 PM, Russel Winder <russel [at] russel [dot] org [dot] uk> wrote:

Hi,

I found the following somewhere on the Web and it seems to do the right
thing (sort of) under 2.7.7.  However under 2.8.0 I get an error
message.  Is it something trivially simple I am missing?

       class Mapper[A,B] ( data : List[A] , function : A => B ) {
         val pmap = {
           val buffer = new Array[B] ( data.length )
           // Ranges are lazy but we need strict so the .toList
           val mappers = for ( index <- ( 0 until data.length ).toList ) yield
               Futures.future { buffer ( index ) = function ( data ( index ) ) }
           for ( mapper <- mappers ) mapper ( )
           buffer
         }
       }


scalac -optimise Pi_Scala_ParMap.scala
Pi_Scala_ParMap.scala:11: error: cannot find class manifest for element
type B
   val buffer = new Array[B] ( data.length )
                ^
Pi_Scala_ParMap.scala:15: error: mapper of type Nothing does not take
parameters
   for ( mapper <- mappers ) mapper ( )
                                    ^
two errors found


--
Russel.
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