ネストしたタプルをひたすらフラットなタプルにする
きっともっとうまいやり方あるんだろうなー(/ω・＼)ﾁﾗｯ
object TupleImplicits { //defined module TupleImplicits
//
object tuple2Flat { //
def apply[A, B, C](x: Tuple2[A, Tuple2[B, C]]) = { //
(x._1, x._2._1, x._2._2) //
} //
def apply[A, B, C, D](x: Tuple2[A, Tuple2[B, Tuple2[C, D]]]) = { //
(x._1, x._2._1, x._2._2._1, x._2._2._2) //
} //
def apply[A, B, C, D, E](x: Tuple2[A, Tuple2[B, Tuple2[C, Tuple2[D, E]]]]) =//
(x._1, x._2._1, x._2._2._1, x._2._2._2._1, x._2._2._2._2) //
} //
def apply[A, B, C, D, E, F](x: Tuple2[A, Tuple2[B, Tuple2[C, Tuple2[D, Tuple//
(x._1, x._2._1, x._2._2._1, x._2._2._2._1, x._2._2._2._2._1, x._2._2._2._2//
} //
} //
//
object tuple3Flat { //
def apply[A, B, C, D](x: Tuple2[A, Tuple3[B, C, D]]) = { //
(x._1, x._2._1, x._2._2, x._2._3) //
} //
} //
//
object tuple4Flat { //
def apply[A, B, C, D, E](x: Tuple2[A, Tuple4[B, C, D, E]]) = { //
(x._1, x._2._1, x._2._2, x._2._3, x._2._4) //
} //
} //
//
implicit class UnTuple[A](t: A) { //
def shift[B](a: B) = (t, a) //
def shift[B, C](a: Tuple2[B, C]) = tuple2Flat(t, a) //
def shift[B, C, D](a: Tuple2[B, Tuple2[C, D]]) = tuple2Flat(t, a) //
def shift[B, C, D, E](a: Tuple2[B, Tuple2[C, Tuple2[D, E]]]) = tuple2Flat(t,//
def shift[B, C, D](a: Tuple3[B, C, D]) = tuple3Flat(t, a) //
def shift[B, C, D, E](a: Tuple4[B, C, D, E]) = tuple4Flat(t, a) //
} //
} //
//
import TupleImplicits._ //import TupleImplicits._
//
// tuple2 flat //
tuple2Flat(1, (2, 3)) //res0: (Int, Int, Int) = (1,2,3)
tuple2Flat(1, (2, (3, 4))) //res1: (Int, Int, Int, Int) = (1,2,3,4)
tuple2Flat(1, (2, (3, (4, 5)))) //res2: (Int, Int, Int, Int, Int) = (1,2,3,4,5)
//
// tuple3 flat //
tuple3Flat(1, (2, 3, 4)) //res3: (Int, Int, Int, Int) = (1,2,3,4)
//
// tuple4 flat //
tuple4Flat(1, (2, 3, 4, 5)) //res4: (Int, Int, Int, Int, Int) = (1,2,3,4,5)
//
// shift //
1 shift "スフィア" //res5: (Int, String) = (1,スフィア)
1 shift ("スフィア", "乃木坂46") //res6: (Int, String, String) = (1,スフィア,乃木坂46)
(1 shift ("バナナマン" shift (3.0 shift 4L))) //res7: (Int, String, Double, Long) = (1,バナナマン,3.0,4)
//
//
で、
なにがしたかったんだったか忘れた
shapless
コメントで頂いたのを使ってみた
import shapeless._ //import shapeless._
import ops.tuple.FlatMapper //import shapeless.ops.tuple.FlatMapper
import syntax.std.tuple._ //import shapeless.syntax.std.tuple._
import test._ //import shapeless.test._
//
trait LowPriorityFlatten extends Poly1 { //defined trait LowPriorityFlatten
implicit def default[T] = at[T](Tuple1(_)) //
} //
object flatten extends LowPriorityFlatten { //defined module flatten
implicit def caseTuple[P <: Product](implicit fm: FlatMapper[P, flatten.type])//
at[P](_.flatMap(flatten)) //
} //
//
val t1 = (1, ((2, 3), 4)) //t1: (Int, ((Int, Int), Int)) = (1,((2,3),4))
val f1 = flatten(t1) //f1: (Int, Int, Int, Int) = (1,2,3,4)
val t2 = (1, (2, (3, 4))) //t2: (Int, (Int, (Int, Int))) = (1,(2,(3,4)))
flatten(t2) //res0: (Int, Int, Int, Int) = (1,2,3,4)
val t3 = ((1, 2), 3) //t3: ((Int, Int), Int) = ((1,2),3)
flatten(t3) //res1: (Int, Int, Int) = (1,2,3)
val t4 = (((((5, (4, (1, 2))), 3)))) //t4: ((Int, (Int, (Int, Int))), Int) = ((5,(4,(1,2))),3)
val f4 = flatten(t4) //f4: (Int, Int, Int, Int, Int) = (5,4,1,2,3)
//
f4.getClass //res2: Class[?0] = class scala.Tuple5
//
すげぇ・・・