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Modules in OCaml
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| trait Lazy[T[_]] { | |
| type Type[X] = T[X] | |
| def mk[A](thunk: () => A): T[A] | |
| } | |
| object LazyThunk extends Lazy[({type Thunk[X] = () => X})#Thunk] { | |
| override def mk[A](thunk: () => A): () => A = thunk | |
| } | |
| trait StreamTrait[Thunk[_]] { | |
| class StreamT[A](val tuple: Lazy[Thunk]#Type[(A, StreamT[A])]) {} | |
| def hd[A](stream: StreamT[A]): A | |
| } | |
| class StreamClass[Thunk[_]](val lazyT: Lazy[Thunk]) extends StreamTrait[Thunk] { | |
| override def hd[A](stream: StreamT[A]): A = ?? | |
| } | |
| // now I have to use it as | |
| object App { | |
| def main(args: Array[String]): Unit = { | |
| val S = new StreamClass(LazyThunk) | |
| // S.hd (something), etc. | |
| // Can I make it static, like StreamClass[LazyThunk]? I just want to simulate modules in OCaml. | |
| // Or what is the canonical way of doing this (mimcking typeclass?) in Scala, without using a module like system? | |
| } | |
| } |
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