jliszka

class Poly(coeffs: Int => Double) {

  // Memoizing coefficient accessor. Returns the coefficient for x^n.
  def apply(n: Int): Double = memo.getOrElseUpdate(n, this.coeffs(n))

  // The memo table
  private val memo = scala.collection.mutable.HashMap[Int, Double]()

  def +(that: Poly): Poly = new Poly(n => this(n) + that(n))

jliszka

abstract class Dual(val rank: Int) {
  self =>

  // Cell value accessor
  protected def get(r: Int, c: Int): Double

  // Memoizing cell value accessor
  def apply(r: Int, c: Int): Double = memo.getOrElseUpdate(r - c, self.get(r, c))

  // The memo table

jliszka

object Injection {
  // A table of constant 0 functions
  def zeroes: Int => (Int => Int) = (n1: Int) => (n2: Int) => 0
  
  // Update an entry in a function table with a new function at the given position.
  def update(t: Int => (Int => Int), k: Int, f: Int => Int): Int => (Int => Int) = {
    (n: Int) => if (n == k) f else t(n)
  }
  
  def diag(hinv: Int => (Int => Int)): Int => Int = {

jliszka

class !<:<[A, B]
implicit def any[A, B]: A !<:< B = new !<:<[A, B]
implicit def sub1[A, B >: A]: A !<:< B = new !<:<[A, B]
implicit def sub2[A, B >: A]: A !<:< B = new !<:<[A, B]

sealed trait ShardKeyNotSpecified
sealed trait ShardAware

trait Sharded

jliszka

sealed trait Limited
sealed trait Unlimited
sealed trait Lim extends Limited with Unlimited

sealed trait Skipped
sealed trait Unskipped
sealed trait Sk extends Skipped with Unskipped

sealed trait Selected
sealed trait Unselected

jliszka

object test {

  sealed trait Limited
  sealed trait Unlimited
  sealed trait Lim extends Limited with Unlimited

  sealed trait Skipped
  sealed trait Unskipped
  sealed trait Sk extends Skipped with Unskipped

jliszka

class !<:<[A, B]
implicit def any[A, B]: A !<:< B = new !<:<[A, B]
implicit def sub1[A, B >: A]: A !<:< B = new !<:<[A, B]
implicit def sub2[A, B >: A]: A !<:< B = new !<:<[A, B]

abstract class Tag
abstract class Unlimited
abstract class Unselected
abstract class Unskipped