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import scala.collection.mutable.MapLike
class SparseArray[@specialized(Int) T:ClassManifest] extends collection.mutable.Map[Int,T] with collection.mutable.MapLike[Int,T,SparseArray[T]] {
override def get(x: Int) = {
val ind = findOffset(x)
if(ind < 0) None else Some(error("ignore"))
}
/**
* Returns the offset into index and data for the requested vector
* index. If the requested index is not found, the return value is
* negative and can be converted into an insertion point with -(rv+1).
*/
private def findOffset(i : Int) : Int = {
error("impl doesn't matter")
}
override def apply(i : Int) : T = { error("ignore") }
override def update(i : Int, value : T) = error("ignore")
override def empty = new SparseArray[T]
def -=(ind: Int) = error("ignore")
def +=(kv: (Int,T)) = error("ignore")
override final def iterator = error("ignore")
}
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