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August 29, 2015 13:56
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more experiments in doing weird type parameterization stuff
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class Mult[A, B](val l: A, val r: B) { | |
def commute: Mult[B, A] = new Mult[B, A](r, l) | |
def associate[C, D](implicit ev: B <:< Mult[C, D]): Mult[Mult[A, C], D] = | |
new Mult[Mult[A, C], D](new Mult(l, r.l), r.r) | |
def left[C](fn: A => C): Mult[C, B] = new Mult(fn(l), r) | |
def right[C](fn: B => C): Mult[A, C] = new Mult(l, fn(r)) | |
} | |
class Div[A, B](val l: A, val r: B) { | |
def associate[C, D](implicit ev: B <:< Div[C, D]): Div[Mult[A, D], C] = { | |
new Div[Mult[A, D], C](new Mult(l, r.r), r.l) | |
} | |
def left[C](fn: A => C): Div[C, B] = new Div(fn(l), r) | |
def right[C](fn: B => C): Div[A, C] = new Div(l, fn(r)) | |
} | |
object TryIt { | |
class Cat | |
class Dog | |
class Mouse | |
val x: Mult[Cat, Dog] = (new Mult(new Dog, new Cat)).commute | |
val y: Mult[Mult[Cat, Dog], Mouse] = (new Mult(new Cat, new Mult(new Dog, new Mouse))).associate | |
val z: Mult[Mouse, Mult[Cat, Dog]] = (new Mult(new Cat, new Mult(new Dog, new Mouse))).associate.commute | |
val a: Div[Mult[Cat, Mouse], Dog] = new Div(new Cat, new Div(new Dog, new Mouse)).associate | |
val b: Div[Mult[Mouse, Cat], Dog] = new Div(new Cat, new Div(new Dog, new Mouse)).associate.left(_.commute) | |
} |
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