RSeq.scala

trait RSeq[+A] extends Reactive[RSeqDelta[A], Seq[A]] {
  def now: Seq[A]
  def size: Signal[Int]
  def apply(idx: Int): Signal[A]
  def contains[B >: A](a: B): Signal[Boolean]
  def count(p: A=>Boolean): Signal[Int]
  def sigCount(p: A=>Boolean): Signal[Int]
  def exists(p: A=>Boolean): Signal[Boolean]
  def sigExists(p: A=>Boolean): Signal[Boolean]  
  
  def map[B](f: A => B): RSeq[B]
  def sigMap[B](f: A => B): RSeq[B]
  def filter(p: A => Boolean): RSeq[A]
  def sigFilter(p: A => Boolean): RSeq[A]
  def flatMap[B](f: A => RSeq[B]): RSeq[B]
  def sigFlatMap[B](f: A => RSeq[B]): RSeq[B]
  def ++[B >: A](that: RSeq[B]): RSeq[B]
  def foldUndo[B](init: B)(op: (B, A) => B)(undo: (B, A) => B): Signal[B]
  def aggregate[B](init: B)(op: (B, A) => B)(combine: (B, B) => B): Signal[B]
  def sigAggregate[B](init: B)(op: (B, A) => B)(combine: (B, B) => B): Signal[B]
}