sing is a type-level metaprogramming library for Scala.
This is based upon the singleton type system emulation.
"sing" represents "singleton" and "compile-time and runtime methods sing in chorus":
import com.github.okomok.sing._
import Dense._
class PrimesTest extends org.scalatest.junit.JUnit3Suite {
final class Sieve extends AsFunction1 {
override type self = Sieve
override def apply[ns <: Any](ns: ns): apply[ns] = ns.asList.tail.filter(NonDiv(ns.asList.head.asNat))
override type apply[ns <: Any] = ns#asList#tail#filter[NonDiv[ns#asList#head#asNat]]
}
val Sieve: Sieve = new Sieve
final case class NonDiv[n <: Nat](n: n) extends AsFunction1 {
override type self = NonDiv[n]
override def apply[x <: Any](x: x): apply[x] = x.asNat.rem(n).nequal(_0)
override type apply[x <: Any] = x#asNat#rem[n]#nequal[_0]
}
final class Head extends AsFunction1 {
override type self = Head
override def apply[x <: Any](x: x): apply[x] = x.asList.head
override type apply[x <: Any] = x#asList#head
}
val Head: Head = new Head
val primes: primes = List.iterate( List.rangeFrom(_2), Sieve ).map(Head)
type primes = List.iterate[ List.rangeFrom[_2], Sieve ]#map[Head]
def testMe {
val some: some = primes.take(_10).force
type some = primes#take[_10]#force
Test.assertSame(some, _2 :: _3 :: _5 :: _7 :: _11 :: _13 :: _17 :: _19 :: _23 :: _29 :: Nil)
Test.assertSame[some, _2 :: _3 :: _5 :: _7 :: _11 :: _13 :: _17 :: _19 :: _23 :: _29 :: Nil]
}
}Shunsuke Sogame <okomok@gmail.com>