Seal TupledFunction to only have instances in internal

Author: nicolasstucki

docs/docs/reference/other-new-features/tupled-function.md

@@ -17,7 +17,7 @@ The type class `TupleFunction` provides a way to abstract directly over function
  *  @tparam G a tupled function type (function of arity 1 receiving a tuple as argument)
  */
 @implicitNotFound("${F} cannot be tupled as ${G}")
-trait TupledFunction[F, G] {
+sealed trait TupledFunction[F, G] {
   def apply(f: F): G
 }
 ```

library/src-3.x/scala/TupledFunction.scala

@@ -8,6 +8,113 @@ import scala.annotation.implicitNotFound
  *  @tparam G a tupled function type (function of arity 1 receiving a tuple as argument)
  */
 @implicitNotFound("${F} cannot be tupled as ${G}")
-trait TupledFunction[F, G] {
+sealed trait TupledFunction[F, G] {
   def apply(f: F): G
 }
+
+package internal {
+
+  object TupledFunction {
+
+    def tupledFunction0[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G =
+        ((args: Unit) => f.asInstanceOf[() => Any].apply()).asInstanceOf[G]
+    }
+
+    def tupledFunction1[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G =
+        ((args: Tuple1[Any]) => f.asInstanceOf[Any => Any].apply(args._1)).asInstanceOf[G]
+    }
+
+    def tupledFunction2[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function2[_, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction3[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function3[_, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction4[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function4[_, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction5[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function5[_, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction6[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function6[_, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction7[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function7[_, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction8[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function8[_, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction9[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function9[_, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction10[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function10[_, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction11[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function11[_, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction12[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function12[_, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction13[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function13[_, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction14[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function14[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction15[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function15[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction16[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function16[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction17[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function17[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction18[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function18[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction19[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function19[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction20[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function20[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction21[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function21[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunction22[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G = f.asInstanceOf[Function22[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _]].tupled.asInstanceOf[G]
+    }
+
+    def tupledFunctionXXL[F, G]: TupledFunction[F, G] = new TupledFunction {
+      def apply(f: F): G =
+        ((args: TupleXXL) => f.asInstanceOf[FunctionXXL].apply(args.elems)).asInstanceOf[G]
+    }
+
+  }
+
+}