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milessabin/tupletype.scala

Last active August 13, 2019 16:51
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tupletype.scala
def tupleType(tpes: List[Type]): Type = {
val PairType = typeOf[_ *: _] match {
case Type.IsAppliedType(tp) => tp.tycon
}
@tailrec
def nestedPairs(tpes: List[Type], acc: Type): Type = tpes match {
case Nil => acc
case hd :: tail => nestedPairs(tail, Type.AppliedType(PairType, List(hd, acc)))
}
tpes.length match {
case 0 => defn.UnitType
case n if n <= 22 => Type.AppliedType(defn.TupleClass(n).asClassDef /* what goes here? */, tpes)
case n => nestedPairs(tpes.reverse, defn.UnitType)
}
}
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