Created
September 12, 2024 19:33
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| import scala.compiletime.ops.int._ | |
| sealed trait Lst[+A, N <: Int] | |
| case object Nil extends Lst[Nothing, 0] | |
| case class Cons[+A, N <: Int](head: A, tail: Lst[A, N]) extends Lst[A, N + 1] | |
| def map2[A, B, C, N <: Int](list1: Lst[A, N], list2: Lst[B, N])(f: (A, B) => C): Lst[C, N] = | |
| (list1, list2) match | |
| case (Nil, Nil) => Nil | |
| case (Cons(h1, t1), Cons(h2, t2)) => | |
| Cons(f(h1, h2), map2(t1, t2)(f)) | |
| extension [A] (head: A) | |
| def :: [N <: Int](tail: Lst[A, N]) = Cons(head, tail) | |
| extension [A : Numeric, N <: Int](list1: Lst[A, N]) | |
| def + (list2: Lst[A, N]) = map2(list1, list2)(summon[Numeric[A]].plus) | |
| @main def main = | |
| val list1 = 1 :: 2 :: Nil | |
| val list2 = 3 :: 4 :: Nil | |
| println(list1 + list2) |
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